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Magnesium alloy with zinc and nickel compound plating layers and preparation method thereof

A composite coating and magnesium alloy technology, applied in the field of metal corrosion and protection, can solve the problems of poor bonding between nickel coating and magnesium alloy substrate, difficulty in achieving satisfactory protection effect, and inability to guarantee high corrosion resistance of the coating, so as to achieve process stability, Beautiful metallic luster, low cost effect

Inactive Publication Date: 2009-09-09
SOUTHEAST UNIV
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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

[0021] The specific operation steps of electroplating zinc and nickel composite coating magnesium alloy are as follows:

[0022] 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;

[0023] 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;

[0024] The first step, pre-plating treatment: activation: activate the degreased magnesium alloy sample with acid solution at 15°C for 1 minute, the concentration of each component in the acid solution is 10ml / L phosphoric acid, 2g / L ammonium hydrogen ...

Embodiment 2

[0032] The specific operation steps of electroplating zinc and nickel composite coating magnesium alloy are as follows:

[0033] 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;

[0034] 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;

[0035] The first step, pre-plating treatment: activation: activate the degreased magnesium alloy sample with an acid solution at 50°C for 10 minutes, the concentration of each component in the acid solution is 5ml / L phosphoric acid, 25g / L ammonium hydr...

Embodiment 3

[0041] The specific operation steps of electroplating zinc and nickel composite coating magnesium alloy are as follows:

[0042] 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;

[0043] 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;

[0044] 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 15ml / L phosphoric acid, 15g / L ammonium hydro...

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Abstract

The invention discloses a magnesium alloy with zinc and nickel compound plating layers and a preparation method thereof. A zinc plating layer of the magnesium alloy is taken as a bottom layer with the width between 20 microns and 25 microns, a nickel plating layer is taken as a surface layer, and the total width of the zinc plating layer and the nickel plating layer is less than or equal to 40 microns. The method comprises the following steps: firstly, plating preliminary treatment, i.e. zinc is activated in an acid solution and then soaked in sulphate; secondly, zinc electrodeposition, i.e. after the zinc is soaked in the sulphate in the first step, the zinc layer of the magnesium alloy is electrodeposited; thirdly, nickel bright plating, i.e. the magnesium alloy which is nicely processed in the second step is brightly plated with nickel in a nickel plating solution; fourthly, sodium silicate water solution sealing. With the method, the obtained zinc plating layer is nicely combined with a base body, has uniform width and high corrosion resistance, can be taken as a protective plating layer to be singly used and can be also taken as a transition layer to carry out plating or chemical plating or other protective or decorative platings, and the nickel plating layer obtained from the zinc plating layer by plating is nicely combined with the zinc plating layer and is uniform, exquisite, bright and beautiful.

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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IPC IPC(8): C22C23/00C25D3/22C25D3/12C25D5/12C25D5/42C25D5/48
Inventor 薛烽王步美周健白晶孙扬善
Owner SOUTHEAST UNIV
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