CN116083917A - Acidic cleaning agent, preparation method and cleaning method - Google Patents

Abstract

The embodiment of the invention discloses an acidic cleaning agent, a preparation method and a cleaning method, which have excellent cleaning effects on various dirt and have a wider application range. The acidic cleaning agent comprises: an acid agent, a first auxiliary agent, a second auxiliary agent, a corrosion inhibitor, an ash remover, a surfactant and a solvent.

Description

Acid cleaning agent, preparation method and cleaning method

Technical Field

The present invention relates to the field of cleaning agents, and more particularly to an acidic cleaning agent, a preparation method and a cleaning method.

Background Art

Aluminum alloy cleaning agents can be used in multiple production processes of electronic equipment made of aluminum alloys and have a wide range of applications. However, there are many problems with existing aluminum alloy cleaning agents. First, the cleaning function is relatively simple and can only clean one or two types of dirt. There is a lot of room for improvement in the scope of application and effect of cleaning. Second, many existing aluminum alloy cleaning agents are formulated from raw materials containing phosphorus, and it is difficult to treat and discharge phosphorus-containing waste liquid. Third, many existing aluminum alloy cleaning agents contain excessive chloride ions, which will cause corrosion points on the surface of the aluminum alloy and reduce the functionality of the aluminum alloy anodized film.

Summary of the invention

An object of embodiments of the present invention is to solve the above-mentioned problems and provide advantages which will be described later.

In a first aspect, an embodiment of the present application discloses an acid cleaning agent, comprising: an acidic agent, a first auxiliary agent, a second auxiliary agent, a corrosion inhibitor, a ash removal agent, a surfactant and a solvent; wherein:

The acidic agent is selected from a combination of one or more acids selected from nicotinic acid, citric acid, nitric acid, glycolic acid, acetic acid, tartaric acid, and oleic acid;

The first auxiliary agent is selected from one or more of sodium citrate, sodium gluconate, potassium sodium tartrate, and sodium sulfate;

The second auxiliary agent is selected from one or more of polyethylene glycol 200, polyethylene glycol 400, polyethylene glycol 600, ethylene glycol, glycerol, and alkyl diphenyl oxide disulfonate;

The corrosion inhibitor is selected from one or more of Lan86, urea, thiourea, imidazoline, and hexamethylenetetramine;

The deashing agent is selected from one or more of sodium fatty alcohol polyoxyethylene ether sulfate, sodium fatty alcohol methyl sulfonate, and sodium secondary alkyl sulfonate;

The surfactant is selected from one or more of fatty alcohol polyoxyethylene ether, lauryl alcohol polyoxyethylene ether, isooctyl alcohol polyoxyethylene ether, octanol polyoxyethylene ether, n-octanol polyoxyethylene ether, and isomeric alcohol glucoside.

In some technical solutions, the acidic cleaning agent is characterized in that it also includes a defoaming agent, and the defoaming agent is a silicon-free defoaming agent.

In some technical solutions, the solvent is deionized pure water.

In a second aspect, the present application also discloses a method for preparing the acid cleaning agent according to the first aspect, comprising:

Step 1: Take the solvent and keep the temperature at 30-40℃;

Step 2: Add a first auxiliary agent to the solvent of step 1, stir and dissolve completely to obtain a first mixture; the first auxiliary agent is selected from one or more of sodium citrate, sodium gluconate, potassium sodium tartrate, and sodium sulfate;

Step 3, adding an acidic agent to the first mixture of step 2, stirring and dissolving completely, to obtain a second mixture; the acidic agent is selected from one or more of nicotinic acid, citric acid, nitric acid, glycolic acid, acetic acid, tartaric acid, and oleic acid;

Step 4: Add a second auxiliary agent, a corrosion inhibitor, a ash remover and a surfactant to the second mixture of step 3 to obtain an acidic cleaning agent; the second auxiliary agent is selected from one or more of polyethylene glycol 200, polyethylene glycol 400, polyethylene glycol 600, ethylene glycol, propylene glycol, and alkyl diphenyl ether disulfonate; the corrosion inhibitor is selected from one or more of Lan86, urea, thiourea, imidazoline, and hexamethylenetetramine; the ash remover is selected from one or more of fatty alcohol polyoxyethylene ether sodium sulfate, fatty alcohol sodium methyl sulfonate, and secondary alkyl sodium sulfonate; the surfactant is selected from one or more of fatty alcohol polyoxyethylene ether, lauryl alcohol polyoxyethylene ether, isooctyl alcohol polyoxyethylene ether, octanol polyoxyethylene ether, n-octanol polyoxyethylene ether, and isomeric alcohol glucoside.

In a third aspect, the present application also discloses a method for cleaning a workpiece using the acid cleaning agent described in the first aspect, comprising:

Take an acidic cleaning agent and prepare it into a first cleaning agent; wherein the concentration of the acidic cleaning agent in the first cleaning agent is 8%;

Using a first cleaning agent to perform a first cleaning on the workpiece to be cleaned in a first ultrasonic cleaning tank to obtain a first cleaned workpiece; wherein the workpiece to be cleaned is an aluminum alloy workpiece, the ultrasonic frequency of the first cleaning is 40 khz 0.8A, the temperature of the first cleaning is 50°C, and the cleaning time is 4 minutes;

Take an acidic cleaning agent and prepare it into a second cleaning agent; wherein the concentration of the acidic cleaning agent in the second cleaning agent is 8%;

Using a second cleaning agent to perform a second cleaning on the first cleaning workpiece in a second ultrasonic cleaning tank to obtain a second cleaning workpiece; wherein the ultrasonic frequency of the second cleaning is 40 khz 0.8A, the temperature of the second cleaning is 50° C., and the cleaning time is 4 minutes;

The second cleaned workpiece is subjected to a triple water washing process, and after washing, is dried at a temperature of 85° C. to obtain a target workpiece.

The beneficial effects of the embodiments of the present application include:

In summary, the acidic cleaning agent of the embodiment of the present application is formed by organically combining an acidic agent, a first auxiliary agent, a second auxiliary agent, a corrosion inhibitor, a ash remover, a surfactant and a solvent, and has an excellent cleaning effect on a variety of dirt and has a wide range of applications. In addition, the acidic cleaning agent does not contain a phosphorus auxiliary agent, and the surfactant therein also does not contain phosphorus, which can avoid the adverse defects caused by phosphorus-containing cleaning agents.

Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention.

DETAILED DESCRIPTION

The present invention is described in further detail below so that those skilled in the art can implement it according to the description.

The term "comprising" and any variations thereof in the embodiments of the present application are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products, or devices.

In addition to the above, it is still necessary to emphasize that the reference to "embodiment" in this article means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

The embodiment of the present application discloses an acidic cleaning agent, which can be used to clean aluminum alloy workpieces and their anodized film layers, and can effectively remove various dirt such as cutting fluid, polishing wax, grinding ash, polishing fluid, etc. generated during the surface processing of aluminum alloy workpieces; at the same time, it has excellent cleaning ability for cutting fluid dirt on aluminum alloy anodized films.

It should be noted that the main components of cutting fluid are ethylene glycol, sodium tetraborate, sodium metasilicate, sodium phosphate, sodium petroleum sulfonate, polyoxyethylene alkylphenol ether, chlorinated paraffin, lead cyclopentane, triethanolamine oleic acid soap, etc. The main components of polishing wax are adhesives such as stearic acid, palmitic acid, oleic acid, rosin, etc., plus abrasives such as feldspar powder, chromium oxide, corundum, iron red, etc. The main components of grinding ash are chromium, manganese, cadmium, lead, mercury, arsenic, etc. The main components of polishing liquid are phosphoric acid, sulfuric acid, hydrochloric acid, hydrofluoric acid, hydrogen peroxide, etc.

Specifically, the acid cleaning agent disclosed in the embodiment of the present application includes: an acidic agent, a first auxiliary agent, a second auxiliary agent, a corrosion inhibitor, a ash removal agent, a surfactant and a solvent; wherein,

The acidic agent is selected from a combination of one or more acids selected from nicotinic acid, citric acid, nitric acid, glycolic acid, acetic acid, tartaric acid, and oleic acid;

The first auxiliary agent is selected from one or more of sodium citrate, sodium gluconate, potassium sodium tartrate, and sodium sulfate;

The second auxiliary agent is selected from one or more of polyethylene glycol 200, polyethylene glycol 400, polyethylene glycol 600, ethylene glycol, glycerol, and alkyl diphenyl oxide disulfonate;

The corrosion inhibitor is selected from one or more of Lan86, urea, thiourea, imidazoline, and hexamethylenetetramine; it should be noted that Lan86 refers to Lan-826 multi-purpose pickling corrosion inhibitor, which is a corrosion inhibitor invented by Professor Jiang Shaohua, director of Lanzhou (Gray) Corrosion Inhibition Technology Research Institute; Lan refers to Lan, representing Lanzhou (Gray) Corrosion Inhibition Technology Research Institute; Lan-826 is called Lan-826, also known as Lan 86, Lan86;

The deashing agent is selected from one or more of sodium fatty alcohol polyoxyethylene ether sulfate, sodium fatty alcohol methyl sulfonate, and sodium secondary alkyl sulfonate;

The surfactant is selected from one or more of fatty alcohol polyoxyethylene ether, lauryl alcohol polyoxyethylene ether, isooctyl alcohol polyoxyethylene ether, octanol polyoxyethylene ether, n-octanol polyoxyethylene ether, and isomeric alcohol glucoside.

It should be noted that the acidic agent can use its own acidity or the excellent integration ability of the active groups it carries to dissolve and disperse special dirt such as the oxide layer attached to the metal surface, and then integrate it into the cleaning liquid to achieve the purpose of cleaning. In addition,

The first auxiliary agent is a cleaning auxiliary agent, which has good water solubility, excellent chelating ability for metal ions in water, and can be biodegraded, thereby being able to improve the dispersibility and anti-redeposition ability.

The second auxiliary agent is a cosolvent that can soluble complex with the insoluble substance to form organic molecular complexes, associates, etc., and generate soluble salts through double decomposition reaction. The cosolvent can dissolve the insoluble substance quickly and effectively.

Corrosion inhibitors can prevent material corrosion. Adding corrosion inhibitors can make organic matter be adsorbed on the surface of the metal, thereby affecting the electrochemical behavior of the surface, inhibiting the anodic and cathodic reactions on the surface, and reducing the corrosion current. Furthermore, corrosion inhibitors can prevent deashing agents and surfactants from corroding aluminum alloys.

Deashing agents have the functions of wetting, penetrating and emulsifying, emulsifying and dispersing oil stains into fine particles for easy cleaning. For example, ultrasound can be used to remove fine particles of dirt.

Surfactants can effectively reduce the surface tension of water, so that oil stains can be separated from the surface of parts and enter the cleaning liquid by forming water-in-oil type particles under the effects of wetting, penetration, emulsification, dispersion and solubilization. In addition, when two or more active agent compounds are rationally and scientifically compounded in the surfactant, the surface tension of the cleaning agent can be more effectively reduced, so that the oil stains can be more effectively separated from the surface of parts, enter the cleaning liquid, and clean the parts more cleanly.

In summary, the acidic cleaning agent of the embodiment of the present application is formed by organically combining an acidic agent, a first auxiliary agent, a second auxiliary agent, a corrosion inhibitor, a ash remover, a surfactant and a solvent, and has an excellent cleaning effect on a variety of dirt and has a wide range of applications. In addition, the acidic cleaning agent does not contain a phosphorus auxiliary agent, and the surfactant therein also does not contain phosphorus, which can avoid the adverse defects caused by phosphorus-containing cleaning agents.

In addition, the acid cleaning agent of the embodiment of the present application does not contain phosphorus, halogen, or heavy metals and is safe and environmentally friendly.

In some embodiments, the acidic cleaning agent is a light yellow transparent liquid with a slight aromatic odor.

In some embodiments, a defoamer is also included, and the defoamer is a silicon-free defoamer. The silicon-free defoamer is easily soluble in water and can easily enter the foam to reduce the surface tension of the foam. Since the surface tension around the foam is almost not reduced, a pressure difference is formed, so that the reduced surface part is pulled and extended by the surroundings, and finally the foam ruptures.

In some embodiments, the solvent is deionized pure water. Chloride ions in water form dilute hydrochloric acid under acidic conditions, which has a great corrosive effect on aluminum alloys and their anodized films. Therefore, the solvent in the embodiments of the present application uses deionized pure water, which can greatly reduce the content of impurities and ions in the water, especially the content of chloride ions, thereby fundamentally ensuring the quality of the water-based cleaning agent.

In some embodiments, in the acid cleaning agent, the concentration of the acidic agent is 1% to 8%.

In some embodiments, in the acid cleaning agent, the concentration of the first auxiliary agent is 3% to 6%.

In some embodiments, in the acid cleaning agent, the concentration of the second auxiliary agent is 3% to 15%.

In some embodiments, in the acid cleaning agent, the concentration of the corrosion inhibitor is 0.1% to 2.5%.

In some embodiments, the concentration of the deashing agent in the acid cleaning agent is 2% to 10%.

In some embodiments, in the acidic cleaning agent, the concentration of the surfactant is 20% to 45%.

In some embodiments, in the acidic cleaning agent, the concentration of the defoaming agent is 0.1% to 0.5%.

In some embodiments, in the acid cleaning agent, the concentration of the solvent is 25%-45%.

Preparation Example

Preparation Example 1:

Step 1: Take the solvent and keep the temperature at 30-40℃;

Step 2, adding the first auxiliary agent to the solvent of step 1, stirring and dissolving completely to obtain a first mixture;

Step 3, adding an acidic agent to the first mixture of step 2, stirring and dissolving completely to obtain a second mixture;

Step 4: adding a co-solvent, a corrosion inhibitor, a ash remover and a surfactant to the second mixture of step 3 to obtain a third mixture;

Step 5: Add defoamer to the third mixture of step 4, stir until completely dissolved and continue stirring for 30 minutes to obtain an acidic cleaning agent; wherein,

The solvent is deionized pure water with a concentration of 41%;

The acidic agent includes 1% niacin, 2% citric acid and 2% glycolic acid;

The first auxiliary agent is sodium citrate with a concentration of 5%;

The second auxiliary agent is polyethylene glycol 400, with a concentration of 10%;

The corrosion inhibitor is Lan86, with a concentration of 0.5%;

The deashing agent is sodium sulfate of fatty alcohol polyoxyethylene ether, with a concentration of 8%;

The surfactant comprises 5% fatty alcohol polyoxyethylene ether, 5% lauryl alcohol polyoxyethylene ether, 3% isooctyl alcohol polyoxyethylene ether, 5% octanol polyoxyethylene ether, 3% n-octanol polyoxyethylene ether, and 9.4% isomeric alcohol glucoside;

The defoamer is a silicon-free defoamer with a concentration of 0.1%.

Preparation Example 2:

The method is basically the same as Preparation Example 1, except that:

The concentration of the solvent is 35%;

The acidic agent includes 2% citric acid, 2% nitric acid, 2% acetic acid and 2% oleic acid;

The first auxiliary agent includes 5% sodium gluconate and 5% potassium sodium tartrate;

The second auxiliary agent includes 6% polyethylene glycol 400 and 4% ethylene glycol;

The corrosion inhibitor includes 3% urea and 3% thiourea;

The deashing agent is sodium sulfate of fatty alcohol polyoxyethylene ether, with a concentration of 5%;

The surfactant comprises 5% fatty alcohol polyoxyethylene ether, 5% lauryl alcohol polyoxyethylene ether, 5% isooctyl alcohol polyoxyethylene ether, 5% octanol polyoxyethylene ether, 3% n-octanol polyoxyethylene ether and 2.9% isomeric alcohol glucoside.

Preparation Example 3:

The method is basically the same as Preparation Example 1, except that:

The concentration of the solvent is 35%;

The acidic agent includes 5% citric acid, 2% tartaric acid and 2% oleic acid;

The first auxiliary agent includes 5% sodium gluconate and 10% sodium sulfate;

The second auxiliary agent includes 5% glycerol and 8% alkyl diphenyl ether disulfonate;

The corrosion inhibitor includes thiourea at a concentration of 3%;

The deashing agent includes 4% sodium fatty alcohol methyl sulfonate and 4% sodium secondary alkyl sulfonate;

The surfactant comprises 5% of lauryl alcohol polyoxyethylene ether, 3% of isooctyl alcohol polyoxyethylene ether, 4% of octanol polyoxyethylene ether, 4% of n-octanol polyoxyethylene ether, and 0.8% of isomeric alcohol glucoside;

The defoamer is a silicon-free defoamer with a concentration of 0.2%.

Preparation Example 4:

The method is basically the same as Preparation Example 1, except that:

The concentration of the solvent is 35%;

The acidic agent includes 1% nicotinic acid, 2% nitric acid, 2% acetic acid and 2% tartaric acid;

The first auxiliary agent includes 5% potassium sodium tartrate and 5% sodium sulfate;

The second auxiliary agent includes 5% polyethylene glycol 200, 5% glycerol and 2% alkyl diphenyl ether disulfonate;

The corrosion inhibitor includes 3% imidazoline and 5% hexamethylenetetramine;

The deashing agent includes 4% sodium fatty alcohol methyl sulfonate;

The surfactant comprises 10% fatty alcohol polyoxyethylene ether, 5% lauryl alcohol polyoxyethylene ether, 3% isooctyl alcohol polyoxyethylene ether, 7% octanol polyoxyethylene ether and 2.9% n-octanol polyoxyethylene ether.

Preparation Example 5:

The method is basically the same as Preparation Example 1, except that:

The concentration of the solvent is 35%;

The acidic agent includes 6% citric acid, 2% nitric acid, 2% glycolic acid and 0.5% oleic acid;

The first auxiliary agent includes 2% sodium citrate, 2% sodium gluconate and 5% sodium sulfate;

The second auxiliary agent includes 5% ethylene glycol and 5% glycerol;

The corrosion inhibitor includes 5% urea and 3% hexamethylenetetramine;

The deashing agent is sodium secondary alkyl sulfonate with a concentration of 4%;

The surfactant comprises 10% fatty alcohol polyoxyethylene ether, 7% lauryl alcohol polyoxyethylene ether, 2.4% isooctyl alcohol polyoxyethylene ether and 3% isomeric alcohol glucoside.

Preparation Example 6:

The method is basically the same as Preparation Example 1, except that:

The concentration of the solvent is 35%;

The acidic agent includes 2% nitric acid, 5% glycolic acid and 2% tartaric acid;

The first auxiliary agent includes 2% sodium gluconate, 2% potassium sodium tartrate and 5% sodium sulfate;

The second auxiliary agent includes 3% ethylene glycol, 5% glycerol and 3% alkyl diphenyl ether disulfonate;

The corrosion inhibitor comprises 5% urea, 4% imidazoline and 3% hexamethylenetetramine;

The deashing agent is sodium sulfate of fatty alcohol polyoxyethylene ether with a concentration of 12%;

The surfactant includes 10% fatty alcohol polyoxyethylene ether and 2.9% lauryl alcohol polyoxyethylene ether.

Preparation Comparative Example

Multi-purpose acid cleaner having the following components:

Citric acid 2%-4%, hydroxyacetic acid 1%-3%, hydroxyethylidene diphosphonic acid 2%-3%, ethylene glycol 4%-5%, isopropanol 3%-6%, hexamethylenetetramine 1%-2%, fatty alcohol polyoxyethylene ether 3%-5%, alkyl diphenyl oxide disulfonate 2%-3%, water 60%-75%.

Cutting cleaning example

Several aluminum alloy mobile phone frames are cut with cutting fluid to prepare several first parts to be cleaned, which are used to implement the following cutting and cleaning examples 1-4 and cutting comparison examples.

Cutting cleaning example 1

Step S101, taking the acidic cleaning agent in Preparation Example 1, and preparing it into a first cleaning agent; wherein the concentration of the acidic cleaning agent in the second cleaning agent is 8%;

Step S102, using a first cleaning agent to perform a first cleaning on a first workpiece in a first ultrasonic cleaning tank to obtain a first cleaned workpiece; wherein the ultrasonic frequency of the first cleaning is 40 khz 0.8A, the temperature of the first cleaning is 50° C., and the cleaning time is 4 minutes;

Step S103, taking the acidic cleaning agent in Preparation Example 1, and preparing it into a second cleaning agent; wherein the concentration of the acidic cleaning agent in the second cleaning agent is 8%;

Step S104, performing a second cleaning on the first cleaning workpiece in a second ultrasonic cleaning tank with a second cleaning agent to obtain a second cleaning workpiece; wherein the ultrasonic frequency of the second cleaning is 40 khz 0.8A, the temperature of the second cleaning is 50° C., and the cleaning time is 4 minutes;

Step S105, performing a triple water washing process on the second cleaned workpiece, and after washing, drying at a temperature of 85°C to obtain a first workpiece to be inspected.

Cutting cleaning example 2

The process is basically the same as in Example 1, except that:

The temperature of the first cleaning was 55°C, and the temperature of the second cleaning was 55°C.

Cutting cleaning example 3

The process is basically the same as in Example 1, except that:

The temperature of the first cleaning was 60°C, and the temperature of the second cleaning was 55°C.

Cutting cleaning example 4

The process is basically the same as in Example 1, except that:

The temperature of the first cleaning was 65°C, and the temperature of the second cleaning was 55°C.

Cutting ratio

It is basically the same as the cutting cleaning example 1, except that: the multi-purpose acid cleaning agent in the preparation comparative example is configured as the first cleaning agent; the multi-purpose acid cleaning agent in the preparation comparative example is configured as the second cleaning agent.

Polishing wax cleaning embodiment

Several aluminum alloy mobile phone frames are polished with white wax to prepare several second parts to be cleaned, which are used to implement the following polishing wax cleaning examples 1-4 and polishing wax comparison examples.

Polishing wax cleaning example 1

Step S101, taking the acidic cleaning agent in Preparation Example 1, and preparing it into a first cleaning agent; wherein the concentration of the acidic cleaning agent in the second cleaning agent is 8%;

Step S102, using a first cleaning agent to perform a first cleaning on the second workpiece to be cleaned in a first ultrasonic cleaning tank to obtain a first cleaned workpiece; wherein the ultrasonic frequency of the first cleaning is 40 khz 0.8A, the temperature of the first cleaning is 65° C., and the cleaning time is 4 minutes;

Step S103, taking the acidic cleaning agent in Preparation Example 1, and preparing it into a second cleaning agent; wherein the concentration of the acidic cleaning agent in the second cleaning agent is 8%;

Step S104, performing a second cleaning on the first cleaning workpiece in a second ultrasonic cleaning tank with a second cleaning agent to obtain a second cleaning workpiece; wherein the ultrasonic frequency of the second cleaning is 40 khz 0.8A, the temperature of the second cleaning is 65° C., and the cleaning time is 4 minutes;

Step S105, performing a triple water washing process on the second cleaned workpiece, and after washing, drying at a temperature of 85°C to obtain a second workpiece to be inspected.

Polishing wax cleaning example 2

The process is basically the same as in polishing and cleaning example 1, except that:

The temperature of the first cleaning was 70°C, and the temperature of the second cleaning was 70°C.

Polishing wax cleaning example 3

The process is basically the same as in polishing and cleaning example 1, except that:

The temperature of the first cleaning was 75°C, and the temperature of the second cleaning was 75°C.

Polishing wax comparison

It is basically the same as the polishing wax cleaning example 1, except that: the multi-purpose acid cleaning agent in the preparation comparison example is configured as the first cleaning agent; the multi-purpose acid cleaning agent in the preparation comparison example is configured as the second cleaning agent.

Grinding dust cleaning example

Several aluminum alloy mobile phone frames were pneumatically polished with water to prepare several third parts to be cleaned, which were used to implement the following polishing and grinding ash cleaning examples 1-4 and grinding ash comparison examples.

Grinding dust cleaning example 1

Step S101, taking the acidic cleaning agent in Preparation Example 1, and preparing it into a first cleaning agent; wherein the concentration of the acidic cleaning agent in the second cleaning agent is 8%;

Step S102, using a first cleaning agent to perform a first cleaning on the third workpiece to be cleaned in a first ultrasonic cleaning tank to obtain a first cleaned workpiece; wherein the ultrasonic frequency of the first cleaning is 40 khz 0.8A, the temperature of the first cleaning is 55° C., and the cleaning time is 4 minutes;

Step S103, taking the acidic cleaning agent in Preparation Example 1, and preparing it into a second cleaning agent; wherein the concentration of the acidic cleaning agent in the second cleaning agent is 8%;

Step S104, performing a second cleaning on the first cleaning workpiece in a second ultrasonic cleaning tank with a second cleaning agent to obtain a second cleaning workpiece; wherein the ultrasonic frequency of the second cleaning is 40 khz 0.8A, the temperature of the second cleaning is 55° C., and the cleaning time is 4 minutes;

Step S105, performing a triple water washing process on the second cleaned workpiece, and after washing, drying at a temperature of 85°C to obtain a third workpiece to be inspected.

Grinding dust cleaning example 2

The process is basically the same as in polishing and cleaning example 1, except that:

The temperature of the first cleaning was 60°C, and the temperature of the second cleaning was 60°C.

Grinding dust cleaning example 3

The process is basically the same as in polishing and cleaning example 1, except that:

The temperature of the first cleaning was 65°C, and the temperature of the second cleaning was 65°C.

Grinding gray ratio

It is basically the same as Example 1 for cleaning grinding dust, except that: the multi-purpose acid cleaning agent in the preparation comparative example is configured as the first cleaning agent; the multi-purpose acid cleaning agent in the preparation comparative example is configured as the second cleaning agent.

Polishing liquid cleaning example

A plurality of aluminum alloy mobile phone frames are polished into mirror surfaces using aluminum alloy mirror polishing liquid to prepare a plurality of fourth parts to be cleaned, which are used to implement the following polishing liquid cleaning examples 1-4 and polishing liquid comparative examples.

Polishing liquid cleaning example 1

Step S101, taking the acidic cleaning agent in Preparation Example 1, and preparing it into a first cleaning agent; wherein the concentration of the acidic cleaning agent in the second cleaning agent is 8%;

Step S102, using a first cleaning agent to perform a first cleaning on the fourth workpiece to be cleaned in a first ultrasonic cleaning tank to obtain a first cleaned workpiece; wherein the ultrasonic frequency of the first cleaning is 40 khz 0.8A, the temperature of the first cleaning is 55° C., and the cleaning time is 4 minutes;

Step S103, taking the acidic cleaning agent in Preparation Example 1, and preparing it into a second cleaning agent; wherein the concentration of the acidic cleaning agent in the second cleaning agent is 8%;

Step S104, performing a second cleaning on the first cleaning workpiece in a second ultrasonic cleaning tank with a second cleaning agent to obtain a second cleaning workpiece; wherein the ultrasonic frequency of the second cleaning is 40 khz 0.8A, the temperature of the second cleaning is 55° C., and the cleaning time is 4 minutes;

Step S105, performing a triple water washing process on the second cleaned workpiece, and after washing, drying at a temperature of 85°C to obtain a fourth workpiece to be inspected.

Polishing liquid cleaning example 2

The process is basically the same as Example 1 of polishing liquid cleaning, except that:

The temperature of the first cleaning was 70°C, and the temperature of the second cleaning was 70°C.

Polishing liquid cleaning example 3

The process is basically the same as Example 1 of polishing liquid cleaning, except that:

The temperature of the first cleaning was 75°C, and the temperature of the second cleaning was 75°C.

Polishing liquid comparison

It is basically the same as the polishing liquid cleaning example 1, except that: the multi-purpose acid cleaning agent in the preparation comparative example is configured as the first cleaning agent; the multi-purpose acid cleaning agent in the preparation comparative example is configured as the second cleaning agent.

Example of cutting and cleaning of anodized film

Several anodized aluminum alloy mobile phone frames are cut to prepare several fifth parts to be cleaned, which are used to implement the following anodized film cutting and cleaning examples 1-4 and anodized film cutting comparative example.

Anodized film cutting and cleaning example 1

Step S101, taking the acidic cleaning agent in Preparation Example 1, and preparing it into a first cleaning agent; wherein the concentration of the acidic cleaning agent in the second cleaning agent is 8%;

Step S102, using a first cleaning agent to perform a first cleaning on the fifth workpiece to be cleaned in a first ultrasonic cleaning tank to obtain a first cleaned workpiece; wherein the ultrasonic frequency of the first cleaning is 40 khz 0.8A, the temperature of the first cleaning is 50° C., and the cleaning time is 4 minutes;

Step S103, taking the acidic cleaning agent in Preparation Example 1, and preparing it into a second cleaning agent; wherein the concentration of the acidic cleaning agent in the second cleaning agent is 8%;

Step S104, performing a second cleaning on the first cleaning workpiece in a second ultrasonic cleaning tank with a second cleaning agent to obtain a second cleaning workpiece; wherein the ultrasonic frequency of the second cleaning is 40 khz 0.8A, the temperature of the second cleaning is 50° C., and the cleaning time is 4 minutes;

Step S105, performing a triple water washing process on the second cleaned workpiece, and after washing, drying at a temperature of 85°C to obtain a fifth workpiece to be inspected.

Anodized film cutting and cleaning example 2

The process is basically the same as in Example 1, except that:

The temperature of the first cleaning was 55°C, and the temperature of the second cleaning was 55°C.

Anodized film cutting and cleaning example 3

The process is basically the same as in Example 1, except that:

The temperature of the first cleaning was 60°C, and the temperature of the second cleaning was 60°C.

Anodized film cutting and cleaning example 4

The process is basically the same as in Example 1, except that:

The temperature of the first cleaning was 65°C, and the temperature of the second cleaning was 65°C.

Anodized film cutting comparison

It is basically the same as Example 1 for cutting and cleaning anodized film, except that: the multi-purpose acid cleaning agent in the preparation comparative example is configured as a first cleaning agent; the multi-purpose acid cleaning agent in the preparation comparative example is configured as a second cleaning agent.

The cleaning methods described in the cutting cleaning examples and the comparative examples were applied to continuously perform cleaning operations within 48 hours, prepare a number of corresponding first workpieces to be inspected, test whether each first workpiece to be inspected was qualified, and calculate the yield rate of the first workpiece to be inspected produced by each cleaning example, as shown in Table 1.

The polishing wax cleaning method described in each cleaning example and the comparative example was used to continuously perform cleaning operations within 48 hours, prepare a number of corresponding second workpieces to be inspected, test whether each second workpiece to be inspected is qualified, and calculate the yield rate of the second workpiece to be inspected produced by each cleaning example, as shown in Table 1.

The grinding ash cleaning method described in each cleaning example and the comparative example was used to continuously perform cleaning operations within 48 hours, prepare a number of corresponding third workpieces to be inspected, test whether each third workpiece to be inspected is qualified, and calculate the yield rate of the third workpiece to be inspected produced by each cleaning example, as shown in Table 1.

The polishing liquid was used to clean the cleaning examples in the embodiment and the method described in the comparative example, and the cleaning operation was continuously performed within 48 hours to prepare a number of corresponding fourth workpieces to be inspected. The fourth workpieces to be inspected were tested to see whether they were qualified. The yield rate of the fourth workpieces to be inspected produced by each cleaning example was statistically analyzed, as shown in Table 1.

The cleaning operations were performed continuously within 48 hours according to the cleaning examples and comparative examples in the anodized film cutting cleaning embodiment, and a number of corresponding fifth workpieces to be inspected were prepared. The qualification of each fifth workpiece to be inspected was tested, and the yield rate of the fifth workpiece to be inspected produced by each cleaning example was statistically analyzed, as shown in Table 1.

It should be noted that the first workpiece to be inspected, the second workpiece to be inspected, the third workpiece to be inspected, and the fourth workpiece to be inspected need to pass the appearance cleanliness test to be qualified.

For the fifth workpiece to be inspected, in addition to meeting the requirements of the appearance cleanliness test, it also needs to meet the standards of the functional test to be qualified.

Appearance cleanliness test :

Visually observe the surface of the workpieces to be inspected (such as the first workpiece to be inspected, the second workpiece to be inspected, the third workpiece to be inspected, the fourth workpiece to be inspected and the fifth workpiece to be inspected) under white light to see if there is any dirt, whether the aluminum alloy is hazy or whitish, whether there are any watermarks, etc.; if there is no dirt, no haziness or whitishness, no watermarks, and the surface is bright and clean, it is qualified.

Functional test (only for workpieces with aluminum alloy anodized film):

① Closed test:

Use a Zebra No. 42 black marker to draw a dot with a diameter of about 2mm on the anode film, wait for 10 seconds, and then wipe the dot with a cloth dampened with pure water. The test is passed if the dot mark can be wiped off without any residue.

②Color difference test:

First, use a colorimeter to select a point on the workpiece to test the initial color difference value (L1, a1, b1), then soak the workpiece in 8% (mass ratio) precision cleaning agent dilution at the verification temperature for 30 minutes, take it out, rinse it with 4 layers of pure water, and dry it at 85℃. Then use a colorimeter to test the color difference value (L2, a2, b2) after immersion treatment at the same point, calculate the value variation before and after immersion treatment, and it is qualified if the variation is less than 0.2.

③Salt spray resistance test:

Immerse the workpiece in 8% (mass ratio) precision cleaning agent dilution at the verification temperature for 30 minutes, take it out and rinse it with 4 times of pure water, dry it at 85℃, and place it in 5% (mass ratio) sodium chloride salt spray for 48 hours. Observe whether there are corrosion spots on the surface of the anodized film. If there are no corrosion spots, it is qualified.

④Aluminum alloy anodized film boiling test:

Immerse all workpieces with aluminum alloy anodized film in 90℃ distilled water and boil them for 30 minutes. Take out the workpieces from the 90℃ distilled water and dry them at 85℃. Compare the boiled aluminum alloy with the non-boiled aluminum alloy. The boiled aluminum alloy anodized film is qualified if there is no change.

Table 1

It should be noted that the functional tests of the workpieces to be tested in Table 1 are completed by random inspection, that is, for each anodized film cutting and cleaning example, some workpieces to be tested are extracted from the corresponding 48-hour total cleaning quantity to test their functionality. Taking anodized film cutting and cleaning example 1 as an example, 5 pieces can be randomly selected from 10010 workpieces to be tested for functional testing. If all 5 pieces are qualified, it is considered that the workpieces to be tested prepared in anodized film cutting and cleaning example 1 have passed the functional test.

According to the results shown in Table 1, the acidic cleaning agent prepared by the embodiment of the present application can not only effectively clean the surface of the aluminum alloy workpiece due to the cutting fluid, polishing wax, grinding ash, polishing fluid and other dirt and residues generated during the processing; it can also clean the cutting fluid residue generated on the surface of the aluminum alloy anodized film due to cutting processing.

There is a great correlation between the cleaning yield and the cleaning temperature. Within a certain temperature range (50-75°C), as the cleaning temperature increases, the cleaning yield will also increase. The cleaning of aluminum alloys is generally at 75°C or below, which not only meets the cleaning requirements of aluminum alloys, but also ensures that the various functional indicators of aluminum alloys can meet the shipping requirements.

The cleaning agent of the embodiment of the present application can be continuously stable during the 48-hour production cycle and can meet the needs of actual production. In practical applications, most ultrasonic cleaning is used, but due to the characteristics of aluminum alloys, as the ultrasonic energy increases, aluminum alloys are more likely to be scratched, so the ultrasonic energy must be strictly controlled. The above verification strictly controls the ultrasonic energy, and the ultrasonic energy used is 0.8A. Under the ultrasonic energy of 0.8A, the workpiece can be completely cleaned without damaging the surface of the aluminum alloy. It is the more commonly used ultrasonic energy for cleaning aluminum alloys.

Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to specific details.

Claims (10)

1. An acidic cleaning agent, comprising: an acid agent, a first auxiliary agent, a second auxiliary agent, a corrosion inhibitor, an ash removal agent, a surfactant and a solvent; wherein,,

the acid agent is selected from one or a combination of more acids of nicotinic acid, citric acid, nitric acid, glycolic acid, acetic acid, tartaric acid and oleic acid;

the first auxiliary agent is one or more selected from sodium citrate, sodium gluconate, sodium potassium tartrate and sodium sulfate;

the second auxiliary agent is selected from one or more of polyethylene glycol 200, polyethylene glycol 400, polyethylene glycol 600, ethylene glycol, glycerol and alkyl diphenyl ether disulfonate;

the corrosion inhibitor is one or more selected from Lan86, urea, thiourea, imidazoline and hexamethylenetetramine;

the ash removing agent is one or more selected from fatty alcohol polyoxyethylene ether sodium sulfate, fatty alcohol methyl sodium sulfonate and secondary alkyl sodium sulfonate;

the surfactant is one or more selected from fatty alcohol polyoxyethylene ether, laurinol polyoxyethylene ether, isooctyl alcohol polyoxyethylene ether, xin Guichun polyoxyethylene ether, n-octyl alcohol polyoxyethylene ether and isomerism alcohol glucoside.

2. The acidic cleaning agent according to claim 1, further comprising an antifoaming agent, which is a silicon-free antifoaming agent.

3. The acidic cleaning agent according to claim 1, wherein the solvent is deionized pure water.

4. The acidic cleaning agent according to claim 1, wherein in the acidic cleaning agent, the concentration of the acidic agent is 1% to 8%, the concentration of the first auxiliary agent is 3% to 6%, the concentration of the second auxiliary agent is 3% to 15%, the concentration of the corrosion inhibitor is 0.1% to 2.5%, the concentration of the ash removing agent is 2% to 10%, and in the acidic cleaning agent, the concentration of the surfactant is 20% to 45%, and the concentration of the solvent is 25% to 45%.

5. The acidic cleaning agent according to claim 2, wherein the concentration of the antifoaming agent is 0.1% to 0.5%.

6. The acidic cleaning agent according to claim 2, wherein the solvent is deionized pure water; the acidic agent comprises nicotinic acid, citric acid and glycolic acid; the first auxiliary agent is sodium citrate; the second auxiliary agent is polyethylene glycol 400; the corrosion inhibitor is Lan86; the ash removing agent is sodium fatty alcohol polyoxyethylene ether sulfate; the surfactant comprises fatty alcohol polyoxyethylene ether, lauryl alcohol polyoxyethylene ether, isooctyl alcohol polyoxyethylene ether, xin Guichun polyoxyethylene ether, n-octyl alcohol polyoxyethylene ether and isomeric alcohol glucoside.

7. The acidic cleaning agent according to claim 2, wherein the solvent is deionized pure water; the acid agent comprises citric acid, nitric acid, acetic acid and oleic acid; the first auxiliary agent comprises sodium gluconate and sodium potassium tartrate; the second auxiliary agent comprises polyethylene glycol 400 and ethylene glycol; the corrosion inhibitor comprises urea and thiourea; the ash removing agent is sodium fatty alcohol polyoxyethylene ether sulfate; the surfactant comprises fatty alcohol polyoxyethylene ether, lauryl alcohol polyoxyethylene ether, isooctyl alcohol polyoxyethylene ether, xin Guichun polyoxyethylene ether, n-octyl alcohol polyoxyethylene ether and isomeric alcohol glucoside.

8. The preparation method of the acidic cleaning agent is characterized by comprising the following steps:

step one, taking a solvent, and keeping the temperature at 30-40 ℃;

step two, adding a first auxiliary agent into the solvent in the step one, and stirring and dissolving completely to obtain a first mixture; the first auxiliary agent is one or more selected from sodium citrate, sodium gluconate, sodium potassium tartrate and sodium sulfate;

step three, adding an acidic agent into the first mixture in the step two, and stirring and dissolving completely to obtain a second mixture; the acid agent is one or more selected from nicotinic acid, citric acid, nitric acid, glycolic acid, acetic acid, tartaric acid and oleic acid;

step four, adding a second auxiliary agent, a corrosion inhibitor, an ash removing agent and a surfactant into the second mixture of the step three to obtain an acidic cleaning agent; the second auxiliary agent is selected from one or more of polyethylene glycol 200, polyethylene glycol 400, polyethylene glycol 600, ethylene glycol, glycerol and alkyl diphenyl ether disulfonate; the corrosion inhibitor is one or more selected from Lan86, urea, thiourea, imidazoline and hexamethylenetetramine; the ash removing agent is one or more selected from fatty alcohol polyoxyethylene ether sodium sulfate, fatty alcohol methyl sodium sulfonate and secondary alkyl sodium sulfonate; the surfactant is one or more selected from fatty alcohol polyoxyethylene ether, laurinol polyoxyethylene ether, isooctyl alcohol polyoxyethylene ether, xin Guichun polyoxyethylene ether, n-octyl alcohol polyoxyethylene ether and isomerism alcohol glucoside.

9. The preparation method of the acidic cleaning agent is characterized by comprising the following steps:

step one, taking a solvent, and keeping the temperature at 30-40 ℃;

step two, adding a first auxiliary agent into the solvent in the step one, and stirring and dissolving completely to obtain a first mixture; the solvent is deionized pure water; the first auxiliary agent is one or more selected from sodium citrate, sodium gluconate, sodium potassium tartrate and sodium sulfate;

step three, adding an acidic agent into the first mixture in the step two, and stirring and dissolving completely to obtain a second mixture; the acid agent is one or more selected from nicotinic acid, citric acid, nitric acid, glycolic acid, acetic acid, tartaric acid and oleic acid;

step four, adding a second auxiliary agent, a corrosion inhibitor, an ash removing agent and a surfactant into the second mixture of the step three to obtain a third mixture; the second auxiliary agent is selected from one or more of polyethylene glycol 200, polyethylene glycol 400, polyethylene glycol 600, ethylene glycol, glycerol and alkyl diphenyl ether disulfonate; the corrosion inhibitor is one or more selected from Lan86, urea, thiourea, imidazoline and hexamethylenetetramine; the ash removing agent is one or more selected from fatty alcohol polyoxyethylene ether sodium sulfate, fatty alcohol methyl sodium sulfonate and secondary alkyl sodium sulfonate; the surfactant is one or more selected from fatty alcohol polyoxyethylene ether, laurinol polyoxyethylene ether, isooctyl alcohol polyoxyethylene ether, xin Guichun polyoxyethylene ether, n-octyl alcohol polyoxyethylene ether and isomerism alcohol glucoside;

step five, adding an antifoaming agent into the third mixture in the step four, and continuously stirring for 30min after stirring and completely dissolving to obtain an acidic cleaning agent; the defoamer is a silicon-free defoamer.

10. A method for cleaning a workpiece using the acidic cleaning agent according to any one of claims 1 to 7, comprising:

taking an acidic cleaning agent to prepare a first cleaning agent; wherein the concentration of the acidic cleaning agent in the first cleaning agent is 8%;

performing first cleaning on the workpiece to be cleaned in a first ultrasonic cleaning tank by using a first cleaning agent to obtain a first cleaned workpiece; wherein the piece to be washed is an aluminum alloy workpiece, the ultrasonic frequency of the first washing is 40khz0.8A, the temperature of the first washing is 50 ℃, and the washing time is 4min;

taking an acidic cleaning agent to prepare a second cleaning agent; wherein the concentration of the acid cleaning agent in the second cleaning agent is 8%;

performing second cleaning on the first cleaning workpiece in a second ultrasonic cleaning tank by using a second cleaning agent to obtain a second cleaning workpiece; wherein the ultrasonic frequency of the second cleaning is 40khz0.8A, the temperature of the second cleaning is 50 ℃, and the cleaning time is 4min;

and (3) performing triple water washing treatment on the second cleaning workpiece, and drying at the temperature of 85 ℃ after water washing to obtain the target workpiece.