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Method for electroplating zinc-nickel coating on magnesium alloy electroplate surface

A technology for electroplating zinc-nickel and magnesium alloys, which is applied in the coating process of metal materials, etc., can solve the problems of poor bonding between the nickel coating and the magnesium alloy substrate, the inability to guarantee the high corrosion resistance of the coating, and the difficulty in achieving satisfactory protection effects, etc., to achieve Stable process, beautiful metallic luster, low cost effect

Inactive Publication Date: 2014-12-24
无锡市森信精密机械厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, electroless nickel plating is the most researched metal coating on magnesium alloys. Generally, basic nickel carbonate or nickel acetate is used as the main salt. However, due to the high chemical activity of magnesium alloys, strong corrosion and replacement will occur after entering the electroless nickel plating solution. reaction, accompanied by a large amount of hydrogen evolution, resulting in poor bonding between the deposited nickel coating and the magnesium alloy substrate, local blistering or convex peeling, these defects cannot guarantee the high corrosion resistance of the coating, and it is difficult to achieve a satisfactory protective effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The specific operation steps of electroplating zinc and nickel composite coating magnesium alloy are as follows:

[0023] Mechanical pretreatment: rough grinding with sandpaper to remove burrs, oxides, lubricants for extrusion, release agents and other foreign matter on the surface of the sample to reduce surface roughness;

[0024] Alkaline washing and degreasing: use the compound solution to remove general oil stains and lubricants on the surface of the sample, where the concentrations of the components in the compound solution are 25g / L sodium hydroxide, 20g / L sodium phosphate, 20g / L sodium carbonate, 0.05g / L sodium lauryl sulfate, the operating temperature is 70-80°C, and the processing time is generally 10 minutes;

[0025] The first step, pre-plating treatment: activation: use acid solution to activate the degreased magnesium alloy sample at 30°C for 1 minute, the concentration of each component in the acid solution is 12g / L oxalic acid, 50g / L sodium fluoride, Th...

Embodiment 2

[0033] The specific operation steps of electroplating zinc and nickel composite coating magnesium alloy are as follows:

[0034] Mechanical pretreatment: rough grinding with sandpaper to remove burrs, oxides, lubricants for extrusion, release agents and other foreign matter on the surface of the sample to reduce surface roughness;

[0035] Alkaline washing and degreasing: use the compound solution to remove general oil stains and lubricants on the surface of the sample, where the concentrations of the components in the compound solution are 25g / L sodium hydroxide, 20g / L sodium phosphate, 20g / L sodium carbonate, 0.05g / L sodium lauryl sulfate, the operating temperature is 70-80°C, and the processing time is generally 10 minutes;

[0036] The first step, pre-plating treatment: activation: use acid solution to activate the degreased magnesium alloy sample at 35°C for 1 minute, the concentration of each component in the acid solution is 14g / L oxalic acid, 60g / L sodium fluoride, Th...

Embodiment 3

[0042] The specific operation steps of electroplating zinc and nickel composite coating magnesium alloy are as follows:

[0043] Mechanical pretreatment: rough grinding with sandpaper to remove burrs, oxides, lubricants for extrusion, release agents and other foreign matter on the surface of the sample to reduce surface roughness;

[0044] Alkaline washing and degreasing: use the compound solution to remove general oil stains and lubricants on the surface of the sample, where the concentrations of the components in the compound solution are 25g / L sodium hydroxide, 20g / L sodium phosphate, 20g / L sodium carbonate, 0.05g / L sodium lauryl sulfate, the operating temperature is 70-80°C, and the processing time is generally 10 minutes;

[0045] The first step, pre-plating treatment: activation: use acid solution to activate the degreased magnesium alloy sample at 25°C for 4 minutes, the concentration of each component in the acid solution is 10g / L oxalic acid, 40g / L sodium fluoride, T...

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Abstract

The invention relates to a method for electroplating a zinc-nickel coating on a magnesium alloy electroplate surface. The method employs a novel pickling activation and zinc immersion pre-treatment technology, wherein an acid solution is the complex formulation solution, the acid solution comprises 10-14g / L oxalic acid, 40-60g / L sodium fluoride, 5-25ml / L phosphoric acid, 2-25g / L ammonium bifluoride and 0.005-5g / L sodium dodecanesulphonate. The activation temperature is 25-35 DEG C, the activation time is 1-5 minutes; wherein the sulfate zinc-immersion technology comprises the following steps: immersing in a zinc-immersion solution comprising 30g of 20-40g / L of zinc sulfate, 5g of 3-7g / L sodium carbonate or potash, 7g of 2-4g / L potassium fluoride and 150g of 100-120g / L potassium pyrophosphate for zinc immersion, wherein the pH of the zinc-immersion solution is between 10.2 and 10.4, the zinc immersion temperature is from 30 DEG C to 70-80 DEG C, wherein the zinc immersion time is 10-15 minutes, and then obtaining the compact and uniform zinc-immersion layer as a base coat for subsequent electroplating. The combination capacity of the coating and a matrix can be increased.

Description

technical field [0001] The invention relates to a method for electroplating zinc and nickel composite coatings on magnesium alloys, belonging to the technical field of metal corrosion and protection. Background technique [0002] Due to its small specific gravity, high electrical and thermal conductivity, good shock resistance, and good processing performance, magnesium alloys are widely used in electronic and electrical industries such as automobiles, motorcycles, computers, communications, instrumentation, home appliances, light industry, chemical industry, and metallurgy. , Aerospace, national defense and other sectors have been more widely used. In the past ten years, the market share of die-casting magnesium alloys has been growing rapidly at an annual rate of about 18%. It is estimated that by 2010, the output of magnesium alloys will reach 850,000 tons. [0003] The use of magnesium alloys as structural materials has broad prospects. However, so far, the application ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/12C25D5/42C23C22/60
Inventor 华兆红
Owner 无锡市森信精密机械厂
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