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Preparation method of corrosion resistant coating layer on surface of magnesium alloy component

A corrosion-resistant coating, magnesium alloy technology, applied in heating inorganic powder coating, nanotechnology and other directions, can solve the problems of easy corrosion, limited application scope, phase transformation of magnesium alloys, etc., to improve corrosion resistance and improve technology Indicators, the effect of strengthening the protective effect

Inactive Publication Date: 2015-10-21
CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, magnesium is a very active metal with high chemical and electrochemical activity, and is easily corroded. Even if it is placed in the air, a very thin oxide film will be formed on its surface, which greatly limits Therefore, the protection of magnesium alloys has attracted more and more attention.
[0004] At present, methods such as plasma micro-arc anodic oxidation, electroplating, and electrochemical plating are mostly used for surface protection of magnesium alloys, but these methods not only play a protective role, but also produce some negative effects.
Such as electroplating and electrochemical plating often bring environmental pollution
[0005] Thermal spraying can also be carried out on the surface of magnesium alloy, such as thermal spraying aluminum alloy on the surface of magnesium alloy, etc., but due to the high temperature during thermal spraying, it will cause phase change of magnesium alloy, decomposition and volatilization of some elements, and oxidation, etc.

Method used

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  • Preparation method of corrosion resistant coating layer on surface of magnesium alloy component
  • Preparation method of corrosion resistant coating layer on surface of magnesium alloy component
  • Preparation method of corrosion resistant coating layer on surface of magnesium alloy component

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] ① Grooving plan Groove the magnesium alloy substrate. The grooves should be evenly distributed on the surface of the substrate and there is no interval between the grooves. V-shaped grooves are used. The groove width is 2.67mm, the groove depth is 5mm, and the included angle is 30°. Grit blast and clean with acetone.

[0027] ②Set the spraying process parameters:

[0028] Powder feeding gas: nitrogen; gas temperature: 500°C; spraying distance: 30mm; gas pressure: 3.5MPa; gas flow rate: 70m3 / hr; powder feeding volume: 2.8m3 / hr.

[0029] ③The magnesium alloy substrate processed in step ① is sprayed, such as figure 1 As shown, the magnesium alloy component 1 is fixed, and the spray gun 2 sprays it in a straight line.

[0030] ④ Use polyvinyl chloride to seal the coating in step ③. The thickness is 100 μm, and it is taken out after being heated in a drying oven at 170° C. for 60 minutes.

[0031] ⑤ combination figure 2 As shown, the prepared coatings were subjected to...

Embodiment 2

[0034] ① Grooving plan Groove the magnesium alloy substrate. The grooves should be evenly distributed on the surface of the substrate and there is no interval between the grooves. V-shaped grooves are used. The groove width is 2.67mm, the groove depth is 5mm, and the included angle is 30°. Grit blast and clean with acetone.

[0035] ②Set the spraying process parameters:

[0036] Powder feeding gas: nitrogen; gas temperature: 550°C; spraying distance: 30mm; gas pressure: 4.0MPa; gas flow rate: 65m3 / hr; powder feeding volume: 3.0m3 / hr.

[0037] ③The magnesium alloy substrate treated in step ① is sprayed, the magnesium alloy component is fixed, and the spray gun is sprayed on it in a straight line.

[0038] ④ Use polyvinyl chloride to seal the coating in step ③. The thickness is 100 μm, and it is taken out after being heated in a drying oven at 170° C. for 60 minutes.

[0039] ⑤ combination image 3 As shown, the prepared coatings were subjected to salt spray test and microst...

Embodiment 3

[0042] ① Grooving plan Groove the magnesium alloy substrate. The grooves should be evenly distributed on the surface of the substrate and there is no interval between the grooves. V-shaped grooves are used. The groove width is 2.67mm, the groove depth is 5mm, and the included angle is 30°. Grit blast and clean with acetone.

[0043] ②Set the spraying process parameters:

[0044] Powder feeding gas: nitrogen; gas temperature: 600°C; spraying distance: 30mm; gas pressure: 4.5MPa; gas flow rate: 60m3 / hr; powder feeding volume: 3.5m3 / hr.

[0045] ③The magnesium alloy substrate treated in step ① is sprayed, the magnesium alloy component is fixed, and the spray gun is sprayed on it in a straight line.

[0046] ④ Use polyvinyl chloride to seal the coating in step ③. The thickness is 100 μm, and it is taken out after being heated in a drying oven at 170° C. for 60 minutes.

[0047] ⑤ combination Figure 4 As shown, the prepared coatings were subjected to salt spray test and micros...

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Abstract

The invention discloses a preparation method of a corrosion resistant coating layer on a surface of a magnesium alloy component. The preparation method is characterized by comprising the following steps: surface pretreatment: a groove is carved in the surface of the magnesium alloy component; then, the sand blasting is performed; and then, acetone is used for cleaning; preparation of a coating layer: an Al-Zn alloy coating layer is prepared on the surface of the magnesium alloy component by cold spraying; and polyvinyl chloride hole sealing: polyvinyl chloride is flatly spread on the upper surface of the coating layer. The cold spraying process is adopted to completely retain a nanometer structure of nanometer Al-Zn alloy powder, so that excellent performances are remained. The hole sealing treatment is performed for the prepared Al-Zn alloy coating layer by polyvinyl chloride, so that the protection effect of the prepared composite coating layer on the basal body is further enhanced, and the corrosion resistance is further improved.

Description

technical field [0001] The invention relates to a magnesium alloy surface treatment method. Background technique [0002] Magnesium alloys have high specific strength, specific stiffness, and specific modulus of elasticity, and also have good thermal conductivity, electrical conductivity, dimensional stability, electromagnetic shielding, and machinability. They are used in aviation, aerospace, automobiles, machinery, etc. It has broad application prospects and is known as "the most potential and promising green engineering material in the 21st century". It is also one of the lightest metal structural materials in practical applications. [0003] However, magnesium is a very active metal with high chemical and electrochemical activity, and is easily corroded. Even if it is placed in the air, a very thin oxide film will be formed on its surface, which greatly limits Therefore, the protection of magnesium alloys has attracted more and more attention. [0004] At present, met...

Claims

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Application Information

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IPC IPC(8): C23C24/08B82Y40/00
Inventor 马冰贾利冯胜强刘光郑子云刘红伟崔烺陈杰李娜杨武林
Owner CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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