Cathode electrophoresis method for coating metallic nickel on magnesium alloy surface

A technology of cathodic electrophoresis and coating method, applied in electrolytic paint, electrophoretic plating, coating and other directions, can solve the problems of cyanide pollution of environmental process, complexity, etc., to improve surface performance, high bonding strength, and reduce environmental pollution Effect

Inactive Publication Date: 2009-07-08
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a coating method with high brightness, high wear resistance and strong corrosion resistance. This method does not need a pre-plating

Method used

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  • Cathode electrophoresis method for coating metallic nickel on magnesium alloy surface
  • Cathode electrophoresis method for coating metallic nickel on magnesium alloy surface
  • Cathode electrophoresis method for coating metallic nickel on magnesium alloy surface

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0019] Example 1

[0020] Take a 20×20×50 cast magnesium alloy sample.

[0021] 1. Conductivity: Electrolyze the prepared experimental water in a specific device to maintain the conductivity of the water at 3uS, and then add 0.5mg / LOP emulsifier.

[0022] 2. Degreasing: Use 5g / L NaOH (saponification) and 8g / L Na for degreasing liquid 2 CO 3 , 1g / L sodium pyrophosphate is an alkaline solution. The temperature during degreasing is required to be maintained at about 50°C, the degreasing time is about 15 minutes, and the degreasing solution is constantly stirred to make the sample fully degreased, so that the surface of the sample can be fully cleaned Oil stains attached.

[0023] 3. Hot water washing: immerse the chemically degreased sample in hot water (deionized water) at a temperature of about 60°C for 2.5 minutes.

[0024] 4. Cold water washing: Wash the above-mentioned hot water-washed sample with flowing deionized water for 2 minutes at room temperature.

[0025] 5. Neutralizat...

Example Embodiment

[0048] Example 2

[0049] Take a 20×20×50 cast magnesium alloy sample.

[0050] 1. Conductivity: Electrolyze the prepared experimental water in a specific device to maintain the conductivity of the water at 3.5uS, and then add 0.5mg / LOP emulsifier.

[0051] 2. Degreasing: select 6g / L NaOH (saponification) and 8g / L Na for degreasing liquid 2 CO 3 , 2g / L sodium pyrophosphate is an alkaline solution, the temperature should be kept at about 50℃ during degreasing, the degreasing time is about 15 minutes, and the degreasing solution should be continuously stirred to make the sample fully degreasing so that the surface of the sample can be cleaned sufficiently Oil stains attached.

[0052] 3. Hot water washing: immerse the chemically degreased sample in hot water (deionized water) at a temperature of about 60°C for 4 minutes.

[0053] 4. Cold water washing: Wash the above-mentioned hot water-washed sample with flowing deionized water for 2 minutes at room temperature.

[0054] 5. Neutral...

Example Embodiment

[0077] Example 3

[0078] Take a 20×20×50 cast magnesium alloy sample.

[0079] 1. Conductivity: Electrolyze the prepared experimental water in a specific device to maintain the conductivity of the water at 4uS, and then add 0.6mg / LOP emulsifier.

[0080] 2. Degreasing: Use 1g / L NaOH (saponification) and 11g / L Na for degreasing liquid 2 CO 3 , 1g / L sodium pyrophosphate is an alkaline solution. The temperature during degreasing is required to be maintained at about 50°C, the degreasing time is about 15 minutes, and the degreasing solution is constantly stirred to make the sample fully degreased, so that the surface of the sample can be fully cleaned Oil stains attached.

[0081] 3. Hot water washing: immerse the chemically degreased sample in hot water (deionized water) at a temperature of about 60°C for 2.5 minutes.

[0082] 4. Cold water washing: Wash the above-mentioned hot water sample at room temperature with flowing deionized water for 3 minutes.

[0083] 5. Neutralization: f...

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Abstract

The invention provides a method for electrophoretic painting metal nickel on magnesium alloy surface cathode which includes steps as follows: electrical conducting water, destressing, degreasing, neutralising, making new, help cleaning, surface adjusting, electrophoresis and mixing color, fixing film, placing film and post-processing procedures, except for fixing film and placing film, working piece needs to be washed between other each two working sequences. The method has characterisitics that the electrophoretic painting forms a metal ceramic layer rich in nickel on magnesium alloy surface, wherein, nickel weight is 8%-10%, remain is non-metal and impurity with 10-12 mum thickness. The electrophoretic solution reduces pollution to environment by using cyanogen-free medicinal solution; plating solution confecting and electrophoretic technique have strong maneuverability, normal technique person in the field can operate; the electrophoretic layer and magnesium alloy lining has strong combination ability, surface does not change and fall off after heat shock 1200 hours, wear rate is 12.02g/a.m(2); corrupt rate is 4.6g/a.m(2); the electrophoretic painting metal nickel layer can increase magnesium alloy surface ability efficiently, and greatly enlarge magnesium alloy application prospect.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to a coating method for cathodic electrophoresis metal on the surface of magnesium alloys, and in particular to a coating method for cathodic electrophoresis metal nickel on the surface of magnesium alloys. Background technique [0002] As a lightweight engineering structural material, magnesium alloy has high specific strength, high specific stiffness and superior shock absorption performance, and is widely used in transportation, communication, aviation, aerospace and other fields. However, the shortcomings of magnesium alloys such as low melting point, poor heat resistance, low surface hardness, wear resistance and corrosion resistance, and poor decoration limit its application fields. Due to the high chemical activity of magnesium and magnesium alloys, an inert oxide layer is easily formed on the surface in the atmospheric environment. Therefore, some conventiona...

Claims

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Application Information

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IPC IPC(8): C25D13/02C25D13/20
Inventor 王赫莹曹辉孙学雁
Owner SHENYANG POLYTECHNIC UNIV
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