Preparation method of electric co-depositing zinc magnesium alloy plating layer in aqueous solution

An alloy coating and co-deposition technology, which is applied in the field of metal surface corrosion protection, can solve the problems of reduced coating smoothness, easy blackening of the coating, and high current density, so as to reduce the deposition rate of zinc, improve corrosion resistance, and increase current density. efficiency effect

Inactive Publication Date: 2012-08-22
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in order to meet the needs of scientific research and production, it is required to quickly react on the surface of the steel plate to form a uniform and dense alloy coating that meets the requirements of corrosion resistance. A high current density is required, and excessive current density will cause burning, making the coating easy to Blackening, pulverization, decreased coating smoothness, and decreased corrosion resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The preparation steps of this embodiment are as follows:

[0025] a. Preparation of acidic plating solution: Weigh 100 g of zinc sulfate heptahydrate and 50 g of magnesium sulfate heptahydrate, dissolve them in distilled water, and prepare 1 L of plating solution.

[0026] b. Add 2.5g / L polyethylene glycol in the plating solution as a surfactant.

[0027] c. Add tartaric acid of 50g / L and sodium hypophosphite of 100g / L in the plating solution, then adjust the pH value of the plating solution to 1 with concentrated sulfuric acid. Place the plating solution in a water bath at 60°C. Magnetic stirring.

[0028] d. Deposit by direct current electroplating method; use cold-rolled low-carbon steel plate for automobiles as cathode electroplating material, use platinum electrode as anode, and feed 2A / cm 2 DC current; electroplating for 2 minutes; finally, an alloy coating of 0.878wt% magnesium was obtained through measurement and conversion.

Embodiment 2

[0030] The preparation steps of this embodiment are as follows:

[0031] a. Preparation of acidic plating solution: Weigh 150 g of zinc sulfate heptahydrate and 100 g of magnesium sulfate heptahydrate, dissolve them in distilled water, and prepare 1 L of plating solution.

[0032] b. Add 1g / L polyethylene glycol as a surfactant in the plating solution.

[0033] c. add the tartaric acid of 200g / L and the sodium hypophosphite of 500g / L again in the plating solution, then adjust the pH value of the plating solution to 1.5 with concentrated sulfuric acid. Place the plating solution in a water bath at 60°C. Magnetic stirring.

[0034] d. Deposit by DC electroplating method; use steel plate as cathodic electroplating material, use platinum electrode as anode, pass through 0.5A / cm 2 DC current; electroplating for 5 minutes; finally, an alloy coating of 1.024wt% magnesium was obtained through measurement and conversion.

Embodiment 3

[0036] The preparation steps of this embodiment are as follows:

[0037] a. Preparation of acidic plating solution: Weigh 350 g of zinc sulfate heptahydrate and 200 g of magnesium sulfate heptahydrate, dissolve them in distilled water, and prepare 1 L of plating solution.

[0038] b. Add 4g / L polyethylene glycol in the plating solution as a surfactant.

[0039] c. Add 120g / L of tartaric acid and 100g / L of sodium hypophosphite in the plating solution, then adjust the pH value of the plating solution to 2 with concentrated sulfuric acid. Place the plating solution in a water bath at 60°C. Magnetic stirring.

[0040] d. Deposit by direct current electroplating method; use cold-rolled low-carbon steel plate for automobiles as cathode electroplating material, use platinum electrode as anode, and feed 1A / cm 2 DC current; electroplating for 3.5min; and finally through measurement and conversion to obtain an alloy coating of 1.987wt% magnesium.

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Abstract

The invention relates to a preparation method of an electric co-depositing zinc magnesium alloy plating layer in an aqueous solution. The preparation method comprises the following steps of: a) preparing an acidic plating solution, preparing a certain amount of zinc sulfate into a solution with a concentration of 100-350g/L, preparing a certain amount of magnesium sulfate into a solution with a concentration of 50-200g/L, and adjusting PH value of the solution to be 1-3 by using sulfuric acid; b) adding polyvinyl glycol as a surface active agent, wherein the concentration of the polyvinyl glycol is 1-4g/L; c) adding complexing agent, namely, adding the complexing agent containing a tartaric acid and sodium monophosphate mixture, wherein the concentration of the tartaric acid is 50-200g/L and the concentration of the sodium monophosphate is 50-150g/L; and d) performing electric deposition by adopting a direct current plating method, thereby lastly obtaining the electric co-depositing zinc magnesium alloy plating layer, wherein the content of magnesium in the plating layer is between 0.8wt% and 2.0wt%. The preparation method provided by the invention has the advantages that the process is stable and is easily operated, and the corrosion resistance of the zinc magnesium alloy plating layer is increased by 3-10 times.

Description

technical field [0001] The invention relates to the technical field of metal surface corrosion protection, in particular to a method for preparing a zinc-magnesium alloy coating by electroplating in an aqueous solution. Background technique [0002] Cold-rolled electroplated sheet is a corrosion-resistant electroplated product. The existing large-scale production of cold-rolled electroplated sheet mainly includes electro-galvanized sheet, electro-galvanized zinc-nickel alloy sheet, etc. Such products are widely used in automobiles, home appliances and other industries because of their beautiful appearance, uniform coating distribution, and no stains. Compared with hot-dip products, electroplating products have thin coating, no spangles, good mechanical properties, easy processing, and good coating properties. Therefore, electroplating products have a wide range of application prospects. [0003] With the progress of production and life, people have put forward higher requir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/56
Inventor 何美凤胡文彬汤广瑞李俊黄胜标唐成龙
Owner SHANGHAI JIAO TONG UNIV
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