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Method for preparing multilayer high corrosion resistant-wear resistant composite protective coating on magnesium alloy surface

A magnesium alloy, high corrosion resistance technology, applied in the field of metal surface treatment, to achieve the effect of high bonding

Inactive Publication Date: 2011-11-09
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The present invention aims at the defects of the single surface treatment technology of magnesium alloys at present, and provides a method for preparing a composite protective layer with good bonding force and high corrosion resistance and wear resistance on the surface of magnesium alloys, so as to meet the protection requirements of magnesium alloy parts in harsh environments. Require

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1. Material preparation: After AZ91D magnesium alloy is cut, polished and polished, it is cleaned and degreased by ultrasonic wave in acetone solution.

[0036] 2. Plasma oxidation: sodium hydroxide 3g / L, sodium silicate 8g / L, the rest is water, and the temperature is room temperature. Oxidation is carried out by pulse method, the pulse frequency is 800Hz, and the current density is 2A / dm 2 , the oxidation time is 60min, and the oxide film thickness is 15μm.

[0037] 3. Chromate sealing: Potassium dichromate 150g / L, sodium carbonate 100g / L, the rest is water. The temperature is 75°C, and the sealing time is 30 minutes.

[0038] 4. ABS resin spraying: Spray ABS resin on the surface of the sample after plasma oxidation, resin composition: ABS resin 250g / L, solvent is dimethyl sulfoxide. The spraying process parameters are as follows: the powder particle size is 400 mesh, the spraying pressure is 1.5MPa, the spraying distance is 30mm, and the thickness of the ABS resin ...

Embodiment 2

[0045] The difference from Example 1 is:

[0046] 1. Material preparation: After AZ31B magnesium alloy is cut, polished and polished, it is cleaned and degreased by ultrasonic wave in acetone solution.

[0047] 2. Plasma oxidation: sodium hydroxide 2g / L, sodium silicate 10g / L, the rest is water, the temperature is 30°C. Oxidation is carried out by pulse method, the pulse frequency is 1000Hz, and the current density is 3A / dm 2 , the oxidation time is 40min, and the oxide film thickness is 15μm.

[0048] 3. Chromate sealing: Potassium dichromate 150g / L, sodium carbonate 100g / L, the rest is water. The temperature is 80°C, and the sealing time is 30 minutes.

[0049] 4. ABS resin spraying: Spray ABS resin on the surface of the sample after plasma oxidation, resin composition: ABS resin 250g / L, solvent is dimethyl sulfoxide. The spraying process parameters are as follows: the powder particle size is 500 mesh, the spraying pressure is 2.0MPa, the spraying distance is 30mm, and t...

Embodiment 3

[0055] The difference from Example 1 is:

[0056] 1. Material preparation: After the ZM5 magnesium alloy is cut, polished and polished, it is cleaned and degreased by ultrasonic waves in acetone solution.

[0057] 2. Plasma oxidation: sodium hydroxide 3g / L, sodium silicate 20g / L, the rest is water, and the temperature is room temperature. Oxidation is carried out by pulse method, the pulse frequency is 500Hz, and the current density is 2.5A / dm 2 , the oxidation time is 50min, and the oxide film thickness is 15μm.

[0058] 3. Chromate sealing: Potassium dichromate 100g / L, sodium carbonate 100g / L, the rest is water. The temperature is 80°C, and the sealing time is 30 minutes.

[0059] 4. ABS resin spraying: Spray ABS resin on the surface of the sample after plasma oxidation, resin composition: ABS resin 250g / L, solvent is dimethyl sulfoxide. The spraying process parameters are as follows: the powder particle size is 600 mesh, the spraying pressure is 2.5MPa, the spraying dis...

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Abstract

The invention relates to a method for preparing a multilayer high corrosion resistant-wear resistant composite protective coating on a magnesium alloy surface, belonging to the technical field of metal surface treatment. The method comprises the following steps that: first, carrying out plasma anodization on a magnesium alloy to form a porous ceramic layer growing on the matrix surface, then, carrying out organic coating hole sealing treatment on the coating, carrying out chemical plating the treated coating to form an Ni-P coating, finally, carrying out electroplating to form a high corrosion resistant-wear resistant Ni-P coating. According to the invention, by the prepared composite protective coating comprising the ceramic layer, the organic coating and the nickel coating on the magnesium alloy surface, the high protection and high wear resistance of the magnesium alloy matrix are realized. According to the invention, the defect of single surface treatment technique of the magnesium alloy is overcome, and the multilayer composite coating formed on the magnesium alloy surface has characteristics of good bonding force, high rigidity, corrosion resistance and wear resistance, thusbeing an ideal protective coating for magnesium alloy, meeting the protective requirements of the magnesium alloy products in the harsh environment.

Description

technical field [0001] The invention relates to a method for preparing a multi-layer high corrosion-resistant and wear-resistant composite protective layer on the surface of a magnesium alloy, and belongs to the technical field of metal surface treatment. Background technique [0002] As a very important light metal material, magnesium alloy is the metal with the smallest density among metal structural materials. Compared with aluminum alloy, magnesium alloy can increase the weight reduction potential by 20-25%, which can meet the requirements of light weight for household appliances, communication electronic devices and automobiles. Quantitative requirements. Magnesium alloy also has superior properties such as high specific strength, high specific stiffness, good damping, good thermal conductivity, and good vibration damping. Wide application prospects. In recent years, the automobile industry has put forward more urgent requirements for the weight reduction of automobil...

Claims

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Application Information

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IPC IPC(8): C23C28/00C25D11/30C23C18/32C23C18/36C25D3/12
Inventor 张伟杜克勤严川伟王福会
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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