CN1259459C - Alkaline solution electroplating zinc-nickel alloy, brass additive components and its preparation method - Google Patents

Abstract

The present invention relates to an additive agent for electroplating zinc-nickel alloy and brass in alkaline solutions and a preparation method thereof, which belongs to the technical field of electroplating. The additive agent comprises the following ingredients: 32 to 36.5 wt% of primary brightening agent, 62.5 to 67 wt% of secondary brightening agent and 0.5 to 1 wt% of surface active agent. The preparation method of the additive agent comprises the following steps: firstly, triethanolmine, vanillin and ethanolamine are measured and taken by a graduated cylinder, the ethanolamine, the vanillin and the triethanolmine are mixed according to the order of the ethanolamine, the vanillin and the triethanolmine and uniformly stirred, and a mixed solution is obtained; then, a small amount of absolute alcohol is used to dissolve coumarin and thiourea, a small amount of distilled water is added, p-toluene sulfonic acid amine, sodium benzenesulfinate, sodium dodecyl sulfate or sodium dodecanesulphonate is added, and a mixed solution is obtained; finally, the two mixed solutions are mixed to be used. The present invention is used for electroplating zinc-nickel alloy and brass by alkaline solutions; the dispersibility and the throwing power are enhanced, and the cost of the additive agent for electroplating liquids is reduced; the uniformity, the compactness and the brightness of plating are greatly improved, and the bonding strength between the plating and a base is greatly enhanced.

Description

Alkaline solution electroplating zinc-nickel alloy, brass additive combination and its preparation method

technical field

The invention relates to an electroplating zinc-nickel alloy and brass additive component and a preparation method thereof, in particular to an alkaline solution electroplating zinc-nickel alloy and brass additive component and a preparation method thereof, belonging to the technical field of electroplating.

Background technique

In alkaline solution, the additive affects the surface roughness, uniformity, dispersion ability and deep plating ability of electroplated zinc-nickel alloy and brass coating. The additive improves the cathode polarization and refines the grains. When the grains of the coating are refined to less than the wavelength of visible light, the light cannot be diffused, making the coating look very bright. Zinc-nickel alloy additives mainly use the principle of alkaline solution zinc plating additives and nickel plating additives, and the alkaline solution prepared by optimizing the combination of zinc-nickel alloy and brass additives, so as to achieve zinc-nickel alloy and brass in alkaline solution To achieve the purpose of light during electroplating. After literature search, it was found that Zhou Xiaorong, Li Huafeng, Liu Liming, etc. in "Research on Electroplating Black Bright Zinc-Nickel Alloy in Alkaline System", (Material Protection, vol.32, No.5, 1999, 1-3) and Zhang Baocheng Editor-in-Chief "Electroplating Technology" (Beijing University of Aeronautics and Astronautics Press, Beijing, 1993) page 199 all uses triethanolamine as an additive for electroplating zinc-nickel alloys in alkaline solution, but the deficiency of triethanolamine additive in the electroplating process is that the coating is not Even, the coating is loose, the bonding strength is poor, the brightness of the coating is not high, and the throwing ability of the solution is poor.

Contents of the invention

The object of the present invention overcomes the above-mentioned defect of prior art, provides a kind of alkaline solution electroplating zinc-nickel alloy, the additive component of brass and its preparation method, make the uniformity, compactness and luminance of coating, the combination with matrix The strength has been greatly improved, and the cost of additives has been reduced.

The present invention is achieved through the following technical solutions, the electroplating solution component weight percent of the present invention is: primary brightener: 32-36.5%, primary brightener is coumarin, 1,4 butynediol, p-toluenesulfonamide, Sodium benzene sulfinate and thiourea are mixed according to the ratio of 1:1:1:1:1. The secondary brightener: 62.5-67%. The secondary brightener is triethanolamine, ethanolamine and vanillin. The mixture obtained by mixing the volume ratio of 10:1-4:10-12, the surfactant: 0.5-1%, the surfactant is sodium dodecyl sulfate or sodium dodecylbenzenesulfonate.

The zinc-nickel alloy additive for alkaline solution electroplating of the present invention is added last in the preparation process of the alkaline zinc-nickel alloy and brass electroplating solution. The additive is realized by using the action of electric field to adsorb on the surface of the metal substrate and affect the deposition process of zinc, nickel and copper ions. Adding it to alkaline electroplating zinc-nickel alloy and brass plating solution can get bright, dense and uniform zinc-nickel alloy and brass coating.

The preparation method of alkaline solution electroplating zinc-nickel alloy of the present invention, brass additive is specifically as follows: at first measure triethanolamine, vanillin, ethanolamine by the volume ratio of 10: 1-4: 10-12 with measuring cylinder, then according to ethanolamine, Mix the three in the order of vanillin and triethanolamine, stir until uniform, and obtain a mixed solution; then weigh coumarin, 1,4-butynediol, and p-toluenesulfonate in a weight ratio of 1:1:1:1:1 Amide, sodium benzenesulfinate, thiourea, dissolve coumarin and thiourea with a small amount of absolute ethanol, add a small amount of distilled water, then add ammonium p-toluenesulfonate, sodium benzenesulfinate, sodium lauryl sulfate or Sodium dialkylsulfonate to obtain a mixed solution; finally the above two mixed solutions are mixed for later use. When preparing the electroplating solution, add it according to the calculated amount.

The calculated amounts of triethanolamine, vanillin and ethanolamine are measured with a measuring cylinder at a volume ratio of 10:1-4:10-12 of triethanolamine:vanillin:ethanolamine. A small amount of absolute ethanol is used to dissolve coumarin and thiourea, and the weight ratio of coumarin and thiourea is 1:2. The temperature of the added distilled water is above 80°C. The weight ratio of adding ammonium p-toluenesulfonate, sodium benzenesulfinate, sodium dodecylsulfate or sodium dodecylsulfonate is 200-300:200-300:1. The two mixed solutions are mixed at a volume ratio of 1:4-6 for use.

The present invention has substantive features and significant progress. The present invention adopts the principle of alkaline solution zinc-plating additive and nickel-plating additive, and the alkaline solution zinc-nickel alloy and brass additive prepared by optimizing combination, thereby reducing the zinc-nickel alloy 1. The cost of additives when electroplating brass in alkaline solution improves the efficiency, and the uniformity, compactness, brightness, and bonding strength of the coating are greatly improved, and a small amount of additives has a higher effect .

Detailed ways

The following examples are provided in conjunction with the content of the additive component of the present invention and its preparation method:

The invention is used for electroplating zinc-nickel alloy and brass in alkaline solution, which improves the dispersion ability and depth ability of the solution, reduces the cost of plating solution additives, and the uniformity, compactness and brightness of the plating layer, and the combination with the substrate The strength has been greatly improved.

Example 1

First, measure triethanolamine, vanillin, and ethanolamine in sequence with a measuring cylinder to 100mL, 10mL, and 100mL respectively, and mix them uniformly in this order as No. 1 solution for later use. Dissolve 10g of coumarin and 20g of thiourea in 10mL of absolute ethanol, then add 100mL of distilled water above 80°C, then add 20g of p-toluenesulfonate, 20g of sodium benzenesulfinate, and 0.1g of sodium dodecyl sulfate, and mix Uniformly used as No. 2 solution. Take 12mL of No. 1 solution and add the mixed No. 2 solution and mix well. After standing still for 24 hours, add 10g/L to the alkaline electroplating brass solution, at 20°C, take the zinc-impregnated ZK60 magnesium alloy as the cathode and stainless steel as the anode, and treat it with a current of 2A/ ^dm2 for 10 minutes. Get a bright, dense and uniform brass coating over 10 microns.

Example 2

First, measure triethanolamine, vanillin, and ethanolamine in sequence with a measuring cylinder to 100mL, 40mL, and 120mL respectively, and mix them uniformly in this order as No. 1 solution for later use. Dissolve 20g of coumarin and 60g of thiourea in 20mL of absolute ethanol, then add 200mL of distilled water above 80°C, then add 60g of amine p-toluenesulfonate, 60g of sodium benzenesulfinate, and 0.2g of sodium dodecyl sulfate, mix Uniformly used as No. 2 solution. Take 30mL of No. 1 solution and add the mixed No. 2 solution and mix well. After standing still for 24 hours, take 10g/L and add it to the alkaline electroplating zinc-nickel alloy solution. At 40°C, take the zinc-impregnated ZL20 aluminum alloy as the cathode and stainless steel as the anode, and treat it with a current of 1A/ ^dm2 for 10 minutes. A bright, dense and uniform zinc-nickel alloy coating of more than 12 microns can be obtained.

Example 3

First, measure triethanolamine, vanillin, and ethanolamine in sequence with a measuring cylinder to 50mL, 5mL, and 50mL respectively, and mix them uniformly in this order as No. 1 solution for later use. Dissolve 10g of coumarin and 30g of thiourea in 10mL of absolute ethanol, then add 100mL of distilled water above 80°C, then add 30g of p-toluenesulfonate, 30g of sodium benzenesulfinate, and 0.1g of sodium dodecyl sulfate, mix Uniformly used as No. 2 solution. Take 25mL of No. 1 solution and add the mixed No. 2 solution and mix well. After standing still for 24 hours, take 10g/L and add it to the alkaline electroplating zinc-nickel alloy solution. At 25°C, take the zinc-impregnated AZ91 magnesium alloy as the cathode and stainless steel as the anode, and treat it with a current of 4A/ ^dm2 for 10 minutes. Bright, dense and uniform zinc-nickel alloy coatings above 18 microns can be obtained.

Claims (6)

1, a kind of basic solution electroplated zinc nickel alloy, the additive of brass, it is characterized in that, the electroplating solution weight percentages of components is: elementary brightening agent: 32-36.5%, elementary brightening agent is a tonka bean camphor, 1,4 butynediol, para toluene sulfonamide, benzene sulfinic acid sodium salt, five kinds of thiocarbamides were by 1: 1: 1: mix the mixture that obtains at 1: 1, second-class brightener: 62.5-67%, second-class brightener is a trolamine, three kinds of thanomin and Vanillins are by 10: the volume ratio of 1-4: 10-12 is mixed the mixture that obtains, tensio-active agent: 0.5-1%, tensio-active agent are sodium lauryl sulphate or Sodium dodecylbenzene sulfonate.

2, the additive compound method of a kind of basic solution electroplated zinc nickel alloy, brass, it is characterized in that, method is as follows: at first with graduated cylinder by 10: the volume ratio of 1-4: 10-12 is measured trolamine, Vanillin, thanomin is again according to thanomin, Vanillin, the order of trolamine mixes the three, is stirred to evenly, obtains mixing solutions; Then by 1: 1: 1: weight ratio was distinguished weighing tonka bean camphor, 1 in 1: 1,4 butynediol, para toluene sulfonamide, benzene sulfinic acid sodium salt, thiocarbamide, with a small amount of anhydrous alcohol solution tonka bean camphor and thiocarbamide, add a small amount of distilled water, add tosic acid amine again, benzene sulfinic acid sodium salt, sodium lauryl sulphate or sodium laurylsulfonate obtain mixing solutions; Mix above-mentioned two mixing solutionss stand-by at last.

3, the additive compound method of basic solution electroplated zinc nickel alloy according to claim 2, brass is characterized in that, a small amount of anhydrous alcohol solution tonka bean camphor of described usefulness and thiocarbamide, and tonka bean camphor and thiocarbamide weight ratio are 1: 2.

4, the additive compound method of basic solution electroplated zinc nickel alloy according to claim 2, brass is characterized in that, the distilled water of described adding is more than 80 ℃.

5, the additive compound method of basic solution electroplated zinc nickel alloy according to claim 2, brass, it is characterized in that the weight ratio of described adding tosic acid amine and benzene sulfinic acid sodium salt and sodium lauryl sulphate or sodium laurylsulfonate is 200-300: 200-300: 1.

6, the additive compound method of basic solution electroplated zinc nickel alloy according to claim 2, brass is characterized in that, two mixing solutionss by volume 1: 4-6 mixes stand-by.