CN114292591B - Membrane treatment liquid and preparation method and application thereof - Google Patents

Abstract

The invention relates to a film layer treating fluid and a preparation method and application thereof, and aims to solve the problems of high cost, high toxicity and environmental pollution of a surface coating of an iron plate in the prior art. The invention provides a film layer treating fluid which is characterized by comprising the following components in parts by weight: 1-20 parts of tannic acid, 0.02-3 parts of hydrolyzed silane and 100-2000 parts of water; the hydrolyzed silane is obtained by hydrolyzing a silane coupling agent. The invention obviously improves the corrosion resistance of the iron plate by specific components and specific dosage and solves the problems of high toxicity, environmental pollution and the like.

Description

A kind of film layer treatment liquid and its preparation method and application

technical field

The invention relates to the technical field of base material anticorrosion, in particular to a film layer treatment liquid and its preparation method and application.

Background technique

The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art.

According to statistics, corrosion accidents account for about 31% of chemical accidents, which also cause great harm to the ecological environment, economy, and human life safety. According to estimates by foreign authoritative organizations, if the anti-corrosion technology is appropriate, 30%-40% of the corrosion loss can be recovered. Therefore, improving its safety, reliability and service life is of great significance for saving expenses, reducing costs, and improving production efficiency. Laminating technology is one of the most direct and cost-effective methods for steel protection. The traditional metal surface treatment process (phosphating and chromium treatment) has high toxicity and high protection cost. Therefore, it has become an important issue to develop an environmentally friendly, low-cost and easy-to-operate metal anti-corrosion technology.

Contents of the invention

The object of the present invention is to provide a film layer treatment solution and its preparation method and application, so as to solve the problems of high cost, high toxicity and environmental pollution of the iron plate surface coating in the prior art. The invention significantly improves the corrosion resistance of the iron plate through specific components and specific dosage, and solves the problems of high toxicity, environmental pollution and the like.

In order to solve the above technical problems, the following technical solutions are provided.

A film layer treatment solution, which consists of the following components by weight: 1-20 parts of tannic acid, 0.02-3 parts of hydrolyzed silane, 100-2000 parts of water; preferably, 10 parts of tannic acid, 0.05-1.5 1 part hydrolyzed silane and water;

The hydrolyzed silane is obtained by hydrolysis of a silane coupling agent.

Further, the hydrolyzed silane is obtained by hydrolyzing a silane coupling agent in a mixed solvent of ethanol and water.

Further, the amount of the silane coupling agent is 5 mL; the amount of the mixed solvent of ethanol and water is 95 mL; the weight ratio of ethanol and water is 1:4.

The preparation method of the above-mentioned membrane layer treatment solution comprises the steps of:

(1) The silane coupling agent is dissolved in a mixed solvent of ethanol and water, and hydrolyzed at room temperature to obtain hydrolyzed silane;

(2) take by weighing 10 parts of tannic acid and be dissolved in 1000 parts of water;

(3) Mix 0.05-1.5 parts of hydrolyzed silane with the solution obtained in step (2) evenly to prepare a membrane layer treatment solution.

Further, the hydrolysis time is 3-48h.

Further, the amount of hydrolyzed silane is 0.35 parts.

The anti-corrosion coating for the iron plate can be obtained by coating the above-mentioned film layer treatment solution on the iron plate requiring anti-corrosion.

The specific application method of the above coating is as follows:

(1) Carry out surface pretreatment to iron plate;

(2) Immerse the iron plate after the surface pretreatment into the film layer treatment liquid, leave standstill, and obtain the iron plate with the anti-corrosion coating on the surface;

(3) The iron plate coated with the anti-corrosion coating is taken out, rinsed, and dried to obtain the iron plate with the anti-corrosion coating.

Further, the surface pretreatment of the iron plate specifically includes sanding the iron plate with sandpaper, cleaning and drying the iron plate, and removing dust and sundries adsorbed on the inner wall of the pipeline.

The sandpaper used for grinding the board is 80 mesh sandpaper, 400 mesh sandpaper, 800 mesh sandpaper and 1200 mesh sandpaper.

Further, the standing time is 1-30min. Preferably, the standing time is 1 min.

The specific method for drying the plate coated with the anti-corrosion coating includes: hanging the plate coated with the anti-corrosion coating vertically after being rinsed, and standing to dry.

Stir the tannic acid, the hydrolyzed silane coupling agent and a certain quality of water evenly to obtain the anti-corrosion coating mixture; after polishing the iron plate with sandpaper, clean and dry; mix the anti-corrosion coating mixture until uniform Finally, the polished iron plate is immersed in it to obtain a plate coated with an anti-corrosion coating; the iron plate coated with an anti-corrosion coating is taken out, rinsed, and dried to obtain a plate with an anti-corrosion coating.

Beneficial effects of the present invention:

(1) Due to the introduction of tannic acid, the present invention replaces the toxic or polluting components in the traditional conversion coating layer, and realizes the preparation of an environmentally friendly coating. And the composition is simple, and the anticorrosion of the iron plate can be realized.

(2) The preparation process of the coating of the present invention is simple, easy to operate, and low in cost.

(3) The present invention significantly improves the corrosion resistance of iron plates through specific components and specific dosages, and solves the problems of high toxicity and environmental pollution.

Description of drawings

The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention, and the schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention.

Fig. 1 is the electrochemical impedance spectrum of the plates with anti-corrosion coating obtained in Examples 1 to 10 of the present invention in a solution containing 3.5% sodium chloride.

Detailed ways

It should be noted that the following detailed description is exemplary and intended to provide further explanation of the present invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Example 1

1. Dissolve 5mL of silane coupling agent in 95mL of ethanol and water mixed solvent (in the mixed solvent, the weight ratio of ethanol and water is 1:4), hydrolyze at room temperature for 24h.

2. Weigh 10 parts of tannic acid and dissolve in 1000 parts of water.

3. Take 0.05 part of hydrolyzed silane and mix with the above solution evenly to prepare the film layer treatment solution.

4. After polishing the iron plate with sandpaper, wash and dry to remove the dust and sundries adsorbed on the inner wall of the pipe.

5. Immerse the polished iron plate in it and let it stand for 10 minutes to obtain a plate coated with an anti-corrosion coating;

6. Taking out the plate coated with the anti-corrosion coating, rinsing, and drying to obtain the plate with the anti-corrosion coating.

The following is to test the protective performance of the plate prepared with anti-corrosion coating. All electrochemical measurements were performed on an electrochemical workstation (CHI 750) in a three-electrode cell with a large platinum plate as the counter electrode and an Ag-AgCl electrode as the reference electrode. The corrosion behavior of modified iron plates in 3.5wt.% NaCl solution was studied by electrochemical impedance spectroscopy.

Example 2

1. Dissolve 5mL of silane coupling agent in 95mL of ethanol and water mixed solvent (in the mixed solvent, the weight ratio of ethanol and water is 1:4), hydrolyze at room temperature for 24h.

2. Weigh 10 parts of tannic acid and dissolve in 1000 parts of water.

3. Take 0.1 part of hydrolyzed silane and mix it evenly with the above solution to prepare the film layer treatment solution.

4. After polishing the iron plate with sandpaper, wash and dry to remove the dust and sundries adsorbed on the inner wall of the pipe.

5. Immerse the polished iron plate in it and let it stand for 10 minutes to obtain a plate coated with an anti-corrosion coating;

6. Taking out the plate coated with the anti-corrosion coating, rinsing, and drying to obtain the plate with the anti-corrosion coating.

The following is to test the protective performance of the plate prepared with anti-corrosion coating. All electrochemical measurements were performed on an electrochemical workstation (CHI 750) in a three-electrode cell with a large platinum plate as the counter electrode and an Ag-AgCl electrode as the reference electrode. The corrosion behavior of modified iron plates in 3.5wt.% NaCl solution was studied by electrochemical impedance spectroscopy.

Example 3

1. Dissolve 5mL of silane coupling agent in 95mL of ethanol and water mixed solvent (in the mixed solvent, the weight ratio of ethanol and water is 1:4), hydrolyze at room temperature for 24h.

2. Weigh 10 parts of tannic acid and dissolve in 1000 parts of water.

3. Take 0.15 parts of hydrolyzed silane and mix with the above solution evenly to prepare the film layer treatment solution.

4. After polishing the iron plate with sandpaper, wash and dry to remove the dust and sundries adsorbed on the inner wall of the pipe.

5. Immerse the polished iron plate in it and let it stand for 10 minutes to obtain a plate coated with an anti-corrosion coating;

6. Taking out the plate coated with the anti-corrosion coating, rinsing, and drying to obtain the plate with the anti-corrosion coating.

The following is to test the protective performance of the plate prepared with anti-corrosion coating. All electrochemical measurements were performed on an electrochemical workstation (CHI 750) in a three-electrode cell with a large platinum plate as the counter electrode and an Ag-AgCl electrode as the reference electrode. The corrosion behavior of modified iron plates in 3.5wt.% NaCl solution was studied by electrochemical impedance spectroscopy.

Example 4

1. Dissolve 5mL of silane coupling agent in 95mL of ethanol and water mixed solvent (in the mixed solvent, the weight ratio of ethanol and water is 1:4), hydrolyze at room temperature for 24h.

2. Weigh 10 parts of tannic acid and dissolve in 1000 parts of water.

3. Take 0.35 parts of hydrolyzed silane and mix with the above solution evenly to prepare the film layer treatment solution.

4. After polishing the iron plate with sandpaper, wash and dry to remove the dust and sundries adsorbed on the inner wall of the pipe.

5. Immerse the polished iron plate in it and let it stand for 10 minutes to obtain a plate coated with an anti-corrosion coating;

6. Taking out the plate coated with the anti-corrosion coating, rinsing, and drying to obtain the plate with the anti-corrosion coating.

The following is to test the protective performance of the plate prepared with anti-corrosion coating. All electrochemical measurements were performed on an electrochemical workstation (CHI 750) in a three-electrode cell with a large platinum plate as the counter electrode and an Ag-AgCl electrode as the reference electrode. The corrosion behavior of modified iron plates in 3.5wt.% NaCl solution was studied by electrochemical impedance spectroscopy.

Example 5

1. Dissolve 5mL of silane coupling agent in 95mL of ethanol and water mixed solvent (in the mixed solvent, the weight ratio of ethanol and water is 1:4), hydrolyze at room temperature for 24h.

2. Weigh 10 parts of tannic acid and dissolve in 1000 parts of water.

3. Take 0.5 part of hydrolyzed silane and mix with the above solution evenly to prepare the film layer treatment solution.

4. After polishing the iron plate with sandpaper, wash and dry to remove the dust and sundries adsorbed on the inner wall of the pipe.

5. Immerse the polished iron plate in it and let it stand for 10 minutes to obtain a plate coated with an anti-corrosion coating;

6. Taking out the plate coated with the anti-corrosion coating, rinsing, and drying to obtain the plate with the anti-corrosion coating.

The following is to test the protective performance of the plate prepared with anti-corrosion coating. All electrochemical measurements were performed on an electrochemical workstation (CHI 750) in a three-electrode cell with a large platinum plate as the counter electrode and an Ag-AgCl electrode as the reference electrode. The corrosion behavior of modified iron plates in 3.5wt.% NaCl solution was studied by electrochemical impedance spectroscopy.

Example 6

1. Dissolve 5mL of silane coupling agent in 95mL of ethanol and water mixed solvent (in the mixed solvent, the weight ratio of ethanol and water is 1:4), hydrolyze at room temperature for 24h.

2. Weigh 10 parts of tannic acid and dissolve in 1000 parts of water.

3. Take 1 part of hydrolyzed silane and mix with the above solution evenly to prepare the film layer treatment solution.

4. After polishing the iron plate with sandpaper, wash and dry to remove the dust and sundries adsorbed on the inner wall of the pipe.

5. Immerse the polished iron plate in it and let it stand for 10 minutes to obtain a plate coated with an anti-corrosion coating;

6. Taking out the plate coated with the anti-corrosion coating, rinsing, and drying to obtain the plate with the anti-corrosion coating.

The following is to test the protective performance of the plate prepared with anti-corrosion coating. All electrochemical measurements were performed on an electrochemical workstation (CHI 750) in a three-electrode cell with a large platinum plate as the counter electrode and an Ag-AgCl electrode as the reference electrode. The corrosion behavior of modified iron plates in 3.5wt.% NaCl solution was studied by electrochemical impedance spectroscopy.

Example 7

1. Dissolve 5mL of silane coupling agent in 95mL of ethanol and water mixed solvent (in the mixed solvent, the weight ratio of ethanol and water is 1:4), hydrolyze at room temperature for 24h.

2. Weigh 10 parts of tannic acid and dissolve in 1000 parts of water.

3. Take 1.5 parts of hydrolyzed silane and mix with the above solution evenly to prepare the film treatment solution.

4. After polishing the iron plate with sandpaper, wash and dry to remove the dust and sundries adsorbed on the inner wall of the pipe.

5. Immerse the polished iron plate in it and let it stand for 10 minutes to obtain a plate coated with an anti-corrosion coating;

6. Taking out the plate coated with the anti-corrosion coating, rinsing, and drying to obtain the plate with the anti-corrosion coating.

The following is to test the protective performance of the plate prepared with anti-corrosion coating. All electrochemical measurements were performed on an electrochemical workstation (CHI 750) in a three-electrode cell with a large platinum plate as the counter electrode and an Ag-AgCl electrode as the reference electrode. The corrosion behavior of modified iron plates in 3.5wt.% NaCl solution was studied by electrochemical impedance spectroscopy.

Example 8

1. Dissolve 5mL of silane coupling agent in 95mL of ethanol and water mixed solvent (in the mixed solvent, the weight ratio of ethanol and water is 1:4), hydrolyze at room temperature for 24h.

2. Weigh 10 parts of tannic acid and dissolve in 1000 parts of water.

3. Take 0.35 parts of hydrolyzed silane and mix with the above solution evenly to prepare the film layer treatment solution.

4. After polishing the iron plate with sandpaper, wash and dry to remove the dust and sundries adsorbed on the inner wall of the pipe.

5. Immerse the polished iron plate in it and let it stand for 1 minute to obtain a plate coated with an anti-corrosion coating;

6. Taking out the plate coated with the anti-corrosion coating, rinsing, and drying to obtain the plate with the anti-corrosion coating.

The following is to test the protective performance of the plate prepared with anti-corrosion coating. All electrochemical measurements were performed on an electrochemical workstation (CHI 750) in a three-electrode cell with a large platinum plate as the counter electrode and an Ag-AgCl electrode as the reference electrode. The corrosion behavior of modified iron plates in 3.5wt.% NaCl solution was studied by electrochemical impedance spectroscopy.

Example 9

1. Dissolve 5mL of silane coupling agent in 95mL of ethanol and water mixed solvent (in the mixed solvent, the weight ratio of ethanol and water is 1:4), hydrolyze at room temperature for 24h.

2. Weigh 10 parts of tannic acid and dissolve in 1000 parts of water.

3. Take 0.35 parts of hydrolyzed silane and mix with the above solution evenly to prepare the film layer treatment solution.

4. After polishing the iron plate with sandpaper, wash and dry to remove the dust and sundries adsorbed on the inner wall of the pipe.

5. Immerse the polished iron plate in it and let it stand for 15 minutes to obtain a plate coated with an anti-corrosion coating;

6. Taking out the plate coated with the anti-corrosion coating, rinsing, and drying to obtain the plate with the anti-corrosion coating.

The following is to test the protective performance of the plate prepared with anti-corrosion coating. All electrochemical measurements were performed on an electrochemical workstation (CHI 750) in a three-electrode cell with a large platinum plate as the counter electrode and an Ag-AgCl electrode as the reference electrode. The corrosion behavior of modified iron plates in 3.5wt.% NaCl solution was studied by electrochemical impedance spectroscopy.

Example 10

1. Dissolve 5mL of silane coupling agent in 95mL of ethanol and water mixed solvent (in the mixed solvent, the weight ratio of ethanol and water is 1:4), hydrolyze at room temperature for 24h.

2. Weigh 10 parts of tannic acid and dissolve in 1000 parts of water.

3. Take 0.35 parts of hydrolyzed silane and mix with the above solution evenly to prepare the film layer treatment solution.

4. After polishing the iron plate with sandpaper, wash and dry to remove the dust and sundries adsorbed on the inner wall of the pipe.

5. Immerse the polished iron plate in it and let it stand for 30 minutes to obtain a plate coated with an anti-corrosion coating;

6. Taking out the plate coated with the anti-corrosion coating, rinsing, and drying to obtain the plate with the anti-corrosion coating.

The following is the protection performance test of the anti-corrosion coating plate prepared in Examples 1-10. All electrochemical measurements were performed on an electrochemical workstation (CHI 750) in a three-electrode cell with a large platinum plate as the counter electrode and an Ag-AgCl electrode as the reference electrode. The corrosion behavior of modified iron plates in 3.5wt.% NaCl solution was studied by electrochemical impedance spectroscopy.

Variation law: the electrochemical impedance spectra of different treatment concentrations (0.005%, 0.01%, 0.015%, 0.035%, 0.05%, 0.1%, 0.15%) are shown in Figure 1a. Under the same concentration of TA, as the concentration of APTES increases, the shape of the electrochemical impedance spectrum changes, and the corrosion protection effect first increases and then decreases, and the best anticorrosion effect is shown when the silane concentration is 0.035%. It can be seen that from the TA film to the TA/APTES film, the diffusion effect in the TA film disappears, indicating that APTES fills the defects of the TA film, prevents the transfer process of the reaction particles in the interfacial corrosion reaction, and the resistance of the film layer appears. As the concentration of APTES continued to increase, the anti-corrosion effect of the overall film layer came from a larger film resistance, indicating that the co-deposition of tannic acid and aminosilane increased the compactness of the film layer. Figure 1b shows the electrochemical impedance spectra of metal substrates immersed in the treatment solution for different treatment times (1 min, 10 min, 15 min, 30 min). It can be seen from the figure that after soaking for 1 min, the capacitance arc of the film layer is relatively large, which has a good corrosion resistance effect. As the treatment time increases, the resistance of the film layer drops sharply, which is due to the destruction of hydrogen ions in the treatment solution and the peeling off of the film layer.

Finally, it should be noted that the above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it is still The technical solutions described in the foregoing embodiments may be modified, or part of them may be equivalently replaced. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention. Although the specific implementation of the present invention has been described above, it is not a limitation to the protection scope of the present invention. Those skilled in the art should understand that on the basis of the technical solution of the present invention, those skilled in the art can do it without creative work. Various modifications or deformations are still within the protection scope of the present invention.

Claims (10)

1. A kind of anticorrosion coating that is used for iron plate is characterized in that, film treatment solution is coated on the iron plate that needs anticorrosion, to obtain final product; The film layer treatment solution is composed of the following components by weight: 1-20 parts of tannic acid, 0.02-3 parts of hydrolyzed silane, 100-2000 parts of water; the hydrolyzed silane is composed of a silane coupling agent in ethanol and water It is obtained by hydrolysis in a mixed solvent; The hydrolysis time is 3-48h; The amount of silane coupling agent is 5 mL; the amount of mixed solvent of ethanol and water is 95 mL; the weight ratio of ethanol and water is 1:4; The application method of the anti-corrosion coating: (1) Surface pretreatment of the iron plate; (2) Immerse the iron plate after surface pretreatment into the film layer treatment solution, and let it stand to obtain an iron plate with an anti-corrosion coating on the surface; the standing time is 1min; (3) taking out the iron plate coated with the anti-corrosion coating, rinsing, and drying to obtain the iron plate with the anti-corrosion coating; In step (3), the iron plate coated with the anti-corrosion coating on the surface is hung vertically after being rinsed, and left to dry. 2 . The anticorrosion coating according to claim 1 , wherein the film treatment liquid consists of the following components in parts by weight: 10 parts of tannic acid, 0.05-1.5 parts of hydrolyzed silane, and 1000 parts of water. 3. according to the preparation method of anticorrosion coating described in any one of the preceding claims, it is characterized in that, comprises the steps: (1) The silane coupling agent is dissolved in a mixed solvent of ethanol and water, and hydrolyzed at room temperature to obtain hydrolyzed silane; (2) Weigh 10 parts of tannic acid and dissolve in 1000 parts of water; (3) Take 0.05-1.5 parts of hydrolyzed silane and mix evenly with the solution obtained in step (2) to prepare a film layer treatment solution. 4. The preparation method according to claim 3, characterized in that the hydrolysis time is 3-48h. 5. The preparation method according to claim 3, characterized in that the amount of hydrolyzed silane is 0.35 parts. 6. the application method of anticorrosion coating as claimed in claim 1, is characterized in that, (1) Surface pretreatment of the iron plate; (2) Immerse the iron plate after surface pretreatment into the film layer treatment solution, and let it stand to obtain an iron plate coated with an anti-corrosion coating on the surface; (3) The iron plate with the anti-corrosion coating on the surface is taken out, rinsed, and dried to obtain the iron plate with the anti-corrosion coating. 7 . The application method according to claim 6 , wherein the surface pretreatment of the iron plate is specifically to polish the iron plate with sandpaper, and then wash and dry the iron plate to remove dust and sundries adsorbed on the inner wall of the pipeline. 8. The application method according to claim 7, wherein the sandpaper used for grinding the iron plate is 80 mesh sandpaper, 400 mesh sandpaper, 800 mesh sandpaper and 1200 mesh sandpaper. 9. The application method according to claim 6, characterized in that the standing time is 1 min. 10. The application method according to claim 6, characterized in that in step (3), the iron plate coated with anti-corrosion coating is hung vertically after being rinsed, and left to dry.

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