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Preparation method of magnesium alloy corrosion resistant prevention coating

A protective coating, magnesium alloy technology, applied in pressure inorganic powder coating and other directions, can solve the problems of poor process reproducibility, micropores in the film layer, pollution of the environment, etc., and achieves easy control of thickness, low heating temperature, and spraying temperature. low effect

Active Publication Date: 2013-08-21
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the micro-arc oxidation technology breaks through the limitation of the working voltage of the traditional anodic oxidation technology. Its process is simple, high in efficiency, and pollution-free, but it has disadvantages such as poor process reproducibility, high price, and micropores and cracks in the film layer.
Electroplating and electroless plating are traditional surface treatment technologies, and their processes usually cause environmental pollution, etc.
The chemical conversion film treatment process contains hexavalent chromium, which is toxic, pollutes the environment, and the cost of waste liquid treatment is also high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The substrate is made of ZM6 magnesium alloy, the size of the workpiece is 100mm×50mm×5mm, and the size of the sprayed surface is 100mm×50mm. The coating material for low-temperature pneumatic spraying is spherical aluminum powder with a particle size in the range of 22-52 μm. Before spraying, the base material is sandblasted and cleaned, and the coating is prepared by low-temperature pneumatic spraying system within 1 hour. The aluminum coating is prepared and compressed under high pressure. The air is powder feeding gas and sweeping gas, the powder feeding pressure is 2.4Mpa, the carrier gas pressure is 2.2MPa; the gas temperature is 300°C; the spraying distance is 20mm; the powder feeding rate is 1.16g / s; the spraying distance is 2mm; The substrate moving speed was 30 mm / s. A coating with a thickness of 150-300 μm is obtained, and the coating is subjected to shot-peening post-treatment under a pressure of 0.06-0.08 MPa by using ceramic pellets with a particle size of...

Embodiment 2

[0032] The substrate is made of ZM6 magnesium alloy, the size of the sample is 100mm×50mm×5mm, and the size of the sprayed surface is 100mm×50mm. Coating materials for low-temperature pneumatic spraying are spherical aluminum powder with a particle size in the range of 22-52 μm and hard wear-resistant Al particles with a particle size in the range of 50-100 μm. 2 o 3 Mixed powder, spherical aluminum powder and hard wear-resistant particles Al 2 o 3 The weight percentage is 75%, 25%. Grind the mixed powder in a ball mill for 48 to 72 hours; sandblast and clean the base material before spraying, and use a low-temperature pneumatic spraying system to prepare the coating within 1 hour to prepare the aluminum coating, and the high-pressure compressed air is used as powder feeding gas and cleaning gas , the powder feeding pressure is 2.4Mpa, the carrier gas pressure is 2.0MPa; the gas temperature is 300°C; the spraying distance is 15mm; the powder feeding rate is 1.16g / s; the spr...

Embodiment 3

[0036] The substrate is made of ZM6 magnesium alloy, the size of the sample is 100mm×50mm×5mm, and the size of the sprayed surface is 100mm×50mm. The coating material for low-temperature pneumatic spraying is a mixed powder of spherical aluminum powder with a particle size in the range of 22-52 μm and hard wear-resistant particles SiC with a particle size in the range of 22-52 μm, spherical aluminum powder and hard wear-resistant particles Al 2 o 3The weight percentage is 90%, 10%. Grind the mixed powder in a ball mill for 48 to 72 hours; sandblast and clean the base material before spraying, and use a low-temperature pneumatic spraying system to prepare the coating within 1 hour to prepare the aluminum coating, and the high-pressure compressed air is used as powder feeding gas and cleaning gas , the powder feeding pressure is 2.4Mpa, the carrier gas pressure is 2.0MPa; the gas temperature is 300°C; the spraying distance is 15mm; the powder feeding rate is 1.16g / s; the sprayi...

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Abstract

The invention relates to a preparation method of a magnesium alloy corrosion resistant coating. The method is characterized in that spherical aluminum powder or spherical aluminum powder and SiC or Al2O3 powder are adopted, compressed air is used as an air source, and then a coating is prepared by a low-temperature pneumatic spraying method. The adopted powder comprises 100% of aluminum powder or 70-98wt% of aluminum powder and 30-2wt% of hard particles. After-treatment is performed by ceramic shot blasting or a 518 sealant produced by the Beijing Institute of Aeronautical Materials. Compared with the prior art, an aluminum coating prepared by the low-temperature pneumatic spraying method is dense with low porosity and high hardness, has good bonding strength with a base body, and has good corrosion resistance and wear resistance, thereby being a good protection coating for corrosion resistance of magnesium alloy.

Description

technical field [0001] The invention relates to a preparation method of a magnesium alloy anti-corrosion protective coating, which belongs to the technical field of surface treatment of metal materials. Background technique [0002] Magnesium alloy has the advantages of low density, high specific strength and specific stiffness, excellent electromagnetic shielding and easy recycling, and has broad application prospects in aviation, automobile, electronics and other fields. Magnesium alloy is 35% lighter than aluminum alloy, and has special toughness and damping ability, so its high strength-weight characteristics are used to manufacture combined parts of aircraft, such as transmission and gearbox of helicopters, gearboxes of fixed-wing aircraft, etc. However, the electrochemical activity of magnesium alloy is relatively high, and it is an anodic metal material compared with other metals. Therefore, in the component system with a combination of various metal materials, in ord...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/04
Inventor 张晓云石仲川刘德鑫陆峰孙志华汤智慧宇波
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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