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Method for preparing cerium-containing zinc coating

A technology of zinc coating and plating solution, which is applied in the field of preparation of cerium-containing zinc coating, can solve problems such as difficult preparation of rare earth, and achieve the effect of easy maintenance of plating solution and high current efficiency

Inactive Publication Date: 2012-10-10
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problem is that the equilibrium potential of rare earth is far negative than the precipitation potential of zinc and hydrogen, which makes the preparation of rare earth in zinc coating more difficult; the complexing agent in different solutions has different deposition effects on rare earth, and further research is needed. further research

Method used

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  • Method for preparing cerium-containing zinc coating
  • Method for preparing cerium-containing zinc coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The preparation process and steps in this embodiment are as follows:

[0022] a. First prepare the sulfate solution of the ion to be plated, and dissolve 60g of crystalline zinc sulfate and 2g of cerous sulfate in distilled water to prepare a 1L plating solution.

[0023] b. Then add 20g of sodium citrate and 20g of sodium hypophosphite to dissolve completely; add dilute sulfuric acid to adjust the pH value to 2, and control the temperature of the plating solution to 55°C.

[0024] c. Electrodeposition is carried out by DC electroplating method; in the electroplating tank filled with the above-mentioned sulfate plating solution, the steel plate to be plated is used as the cathode, and the platinum sheet is used as the anode, and 0.6A / cm 2 The DC current was electroplated for 2 minutes; the Ce content in the coating was finally measured by AES to be 0.1wt%.

Embodiment 2

[0026] The preparation process and steps in this embodiment are as follows:

[0027] a. First prepare the sulfate solution of the ions to be plated. Dissolve 100g of crystalline zinc sulfate and 2g of cerous sulfate in distilled water to prepare a 1L plating solution.

[0028] b. Then add 20g of sodium citrate and 20g of sodium hypophosphite to dissolve completely; add dilute sulfuric acid to adjust the pH value to 2, and control the temperature of the plating solution to 55°C.

[0029] c. Electrodeposition is carried out by DC electroplating method; in the electroplating tank filled with the above-mentioned sulfate plating solution, the steel plate to be plated is used as the cathode, and the platinum sheet is used as the anode, and 1A / cm 2 The DC current was used for electroplating for 2 minutes; the Ce content in the coating was finally measured by AES to be 0.065wt%.

Embodiment 3

[0031] The preparation process and steps in this embodiment are as follows:

[0032] a. First prepare the sulfate solution of the ions to be plated. Dissolve 350g of crystalline zinc sulfate and 2g of cerous sulfate in distilled water to prepare a 1L plating solution.

[0033] b. Then add 30g of sodium citrate and 30g of sodium hypophosphite to dissolve completely; add dilute sulfuric acid to adjust the pH value to 2, and control the temperature of the plating solution to 25°C.

[0034] c. Electrodeposition is carried out by DC electroplating method; in the electroplating tank filled with the above-mentioned sulfate plating solution, the steel plate to be plated is used as the cathode, and the platinum sheet is used as the anode, and 2A / cm 2 The DC current was electroplated for 2 minutes; the Ce content in the coating was finally measured by AES to be 0.05wt%.

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Abstract

The invention discloses a method for preparing cerium-containing zinc coating. The method comprises the following main steps: (1) sulfate plating solution for ions to be plated is prepared, wherein the concentration of zinc sulfate is 50-300g / L, and the concentration of cerium sulfate is 0.2-4g / L; sodium citrate serving as rare earth complexing agent, with the concentration of 5-60g / L is added, and sodium hypophosphite with the concentration of 5-60g / L is added; dilute sulfuric acid is adopted to adjust the pH value of the plating solution to be 1-4; the temperature of the plating solution is controlled to be 15-60 DEG C; (2) the direct current electrodeposition method is adopted for plating; in a plating bath containing the plating solution, carbon steel used as the plated material is used as the cathode, a platinum sheet is adopted as the anode, direct current is introduced to the plating bath, the current density is 0.6-4 A / cm<2>, and the plating time is 1-6 min; and finally, the concentration of cerium in the prepared coating is 0.05-0.3 wt%. Aiming at the sulfate system of the DC (direct current) electrodeposition zinc coating, the sodium citrate and the sodium hypophosphite as the substances are adopted for promoting the deposition of cerium, so that the cathodic polarization behavior of cerium in deposition can be improved, the zinc coating containing trace cerium is finally obtained, and the corrosion resistance of the coating is obviously improved.

Description

technical field [0001] The invention relates to a method for preparing a cerium-containing zinc coating by DC electrodeposition in an acidic sulfate solution, in particular to a preparation method for a cerium-containing zinc coating, which belongs to the technical field of surface engineering and surface anticorrosion treatment. Background technique [0002] Corrosion of metal materials such as iron and steel not only leads to the scrapping of materials and equipment, but also causes huge indirect losses such as shutdown and production reduction, material loss, and environmental pollution, which hinders the development of the national economy. The surface treatment of materials is one of the most economical and effective means to solve the corrosion and protection of materials. Due to the advantages of simple process equipment, easy operation, and low cost, electroplating technology has become one of the most commonly used surface treatment technologies. [0003] At prese...

Claims

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Application Information

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IPC IPC(8): C25D3/56
Inventor 李谋成邬明钰王士栋
Owner SHANGHAI UNIV
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