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Spray coating technology of magnesium alloy surface protective layer

A protective layer and magnesium alloy technology, applied in the field of new surface spraying of magnesium alloy protective layer, can solve problems such as wear, magnesium alloy surface corrosion, environmental pollution, etc., and achieve the effect of low spraying temperature, compact structure and safe operation

Inactive Publication Date: 2008-07-30
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of the present invention comprehensively solves the above-mentioned shortcomings of the fast-setting coating preparation technology and the problems of corrosion and wear on the surface of the magnesium alloy, and at the same time avoids the thin oxide film of the micro-oxidation method, the environmental pollution of the electroplating method and the plasma spraying method. Oxidation and other existing problems in the manufacturing process of magnesium alloy surface protective layer

Method used

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  • Spray coating technology of magnesium alloy surface protective layer
  • Spray coating technology of magnesium alloy surface protective layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Coating process of the present invention divides following three steps:

[0022] (1) Preparation of powder. The 5wt% Al-95wt% Zn alloy is sprayed into fine powder with a particle size of 25-75 microns by supersonic atomization device, collected and sieved before being bottled;

[0023] (2) Treatment before spraying.

[0024] A. Take the zinc-aluminum alloy powder with a particle size of 25-75 microns, place it in a vacuum drying oven and dry it to remove moisture;

[0025] B. Soak the magnesium alloy base material in acetone to degrease, roughen the surface by shot peening, and then preheat the base material;

[0026] (3) Spray the protective layer. Put the dried zinc-aluminum alloy powder into the powder feeder, and fix the substrate parts at a certain distance (usually 5-40mm) from the nozzle, first turn on the gas heater, and the high-pressure gas is heated and sprayed onto the substrate surface, preheat the substrate. The temperature is about 150°C; then the po...

Embodiment 2

[0028] (1) Preparation of powder. The 30wt% Al-70wt% Zn alloy is made into fine powder with a particle size of 25-75 microns by laser evaporation method, collected and sieved before being bottled;

[0029] (2) Treatment before spraying.

[0030] A. Take the zinc-aluminum alloy powder with a particle size of 25-75 microns, place it in a vacuum drying oven and dry it to remove moisture;

[0031] B. Soak the magnesium alloy parts in alcohol to degrease, sandblast and roughen the surface, and then preheat the base material;

[0032] (3), spray protective layer. Put the dried zinc-aluminum alloy powder into the powder feeder, and fix the parts at a distance of 10mm from the nozzle. First turn on the gas heater to preheat the parts, and then turn on the powder feeder. At this time, the supersonic nozzle The jet effect will spray the powder on the surface of the substrate of the component at a high speed under a pressure of 2.5MPa, and form a zinc-aluminum alloy protective coating...

Embodiment 3

[0034] (1) Preparation of powder. Using a supersonic atomization device to make 15wt% Al-85wt% Zn alloy into fine powder with a particle size of 25-75 microns, collect and sieve it and bottle it;

[0035] (2) Treatment before spraying.

[0036] A. Take the zinc-aluminum alloy powder with a particle size of 25-75 microns, and dry it in a vacuum drying oven to remove moisture;

[0037] B. Soak the magnesium alloy parts in acetone or alcohol to degrease, and the surface is shot peened and roughened.

[0038] (3) Spray the protective layer. Put the dried zinc-aluminum alloy micro-powder into the powder feeder, and fix the substrate parts at a distance of 30mm from the nozzle, first turn on the gas heater to preheat the parts to 150°C, and then turn on the powder feeder And the nozzle switch, at this time, under the pressure of 2.0MPa, the supersonic nozzle will spray the micro powder on the surface of the parts by means of the jet effect. On the surface, a zinc-aluminum alloy ...

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Abstract

A process for spraying a protecting layer onto surface of Mg alloy includes such steps as washing basic material (substrate), blasting grits, preheating, preparing superfine ZnAl alloy powder, and spraying at 150-400 deg.C, under 1.5-2.5 MPa three times.

Description

technical field [0001] The invention belongs to the technical field of metal material coating technology, and provides a novel surface spraying technology of a magnesium alloy protective layer. Background technique [0002] At present, the plasma micro-arc anodic oxidation method is mostly used in the surface protection treatment technology of magnesium alloys. This method can not only play an anti-corrosion role, but also play a wear-resistant role. However, the surface oxide film formed by this method is relatively thin, and its wear resistance effect is extremely limited. In addition, magnesium alloys can also be protected by electroplating and electrochemical plating. There is Mg(OH) in the electroplating solution 2 and Cr(OH) 3 The Cr solution can improve the coating quality and provide neutral corrosion protection, but the Cr-containing compound is highly toxic and often causes pollution to the environment. Recent studies have reported that thermal spraying can be p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/08
Inventor 袁晓光刘彦学吕楠黄宏军赵惠
Owner SHENYANG POLYTECHNIC UNIV
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