Preparation method of magnesium alloy surface anticorrosive coating

An anti-corrosion coating, magnesium alloy technology, applied in metal material coating process, coating, melting spray plating and other directions, can solve the problems of low corrosion resistance, can not meet the requirements of use, low hardness of aluminum coating and so on

Active Publication Date: 2019-04-19
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

However, the corrosion resistance and wear resistance of magnesium alloy itself are very poor, which cannot meet the requirements of harsh environments, which limits its application.
[0003] At present, the surface protection method of magnesium alloy is mainly to prepare pure aluminum coating on the surface of magnesium alloy by arc spraying method, but because the energy of arc spraying is too high, it will cause deformation of magnesium alloy components, and the hardness of aluminum coating is low, and the corrosion resistance performance is low. also lower

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  • Preparation method of magnesium alloy surface anticorrosive coating
  • Preparation method of magnesium alloy surface anticorrosive coating
  • Preparation method of magnesium alloy surface anticorrosive coating

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preparation example Construction

[0021] The invention provides a method for preparing a magnesium alloy surface anticorrosion coating, comprising the following steps:

[0022] (1) Pretreating the magnesium alloy matrix;

[0023] (2) heating up the magnesium alloy substrate pretreated in the step (1) to 60-100°C, then maintaining the temperature of the magnesium alloy substrate at 60-100°C, using iron-based amorphous alloy particles as the coating to be sprayed, Supersonic flame spraying is carried out on the surface of the magnesium alloy substrate, and an iron-based amorphous alloy anti-corrosion coating is obtained on the surface of the magnesium alloy substrate.

[0024] In the invention, the magnesium alloy substrate is pretreated.

[0025] In the present invention, the pretreatment preferably includes cleaning, sandblasting and grinding performed in sequence. In the present invention, the cleaning in the pretreatment process can remove the oil stain on the surface of the magnesium alloy substrate, and ...

Embodiment 1

[0041] (1) Place the AZ91 magnesium alloy substrate in ethanol for ultrasonic cleaning;

[0042] (2) 1 hour before spraying, the AZ91 magnesium alloy substrate after ultrasonic cleaning was subjected to dry sandblasting treatment, the abrasive used in the sandblasting treatment was 20# white corundum sand, and the pressure of the sandblasting treatment was 0.65MPa. The speed of sandblasting is 0.5cm / s, and the time of sandblasting is 5min;

[0043] (3) Use a steel brush to polish the surface of the AZ91 magnesium alloy substrate after dry blasting, remove particulate matter, and obtain a clean AZ91 magnesium alloy substrate;

[0044](4) Drying 250-300 mesh iron-based amorphous alloy particles under vacuum conditions at 100° C. for 1 hour to obtain dry iron-based amorphous alloy particles;

[0045] (5) fixing the AZ91 magnesium alloy substrate obtained in step (3); putting the dry iron-based amorphous alloy particles obtained in step (4) into supersonic flame spraying equipmen...

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Abstract

The invention belongs to the technical field of magnesium alloy corrosion prevention, specifically provides a preparation method of a magnesium alloy surface anticorrosive coating, comprising the following steps of: (1) pretreating a magnesium alloy matrix; (2) heating the magnesium alloy matrix pretreated in the step (1) to 60-100 DEG C, then maintaining the temperature of the magnesium alloy matrix at 60-100 DEG C, taking iron-based amorphous alloy particles as a paint to be sprayed, carrying out hypersonic flame spraying on the surface of the magnesium alloy matrix, and obtaining an iron-based amorphous alloy anticorrosive coating on the surface of the magnesium alloy matrix. The preparation method provided by the invention does not deform the magnesium alloy matrix, the surface hardness reaches 580 HV 0.2, the self-corrosion potential of the iron-based amorphous alloy anticorrosive coating is higher than that of AZ91 magnesium alloy, and the self-corrosion current density is lowerthan that of AZ91 magnesium alloy.

Description

technical field [0001] The invention relates to the field of magnesium alloy anticorrosion technology, in particular to a preparation method of a magnesium alloy surface anticorrosion coating. Background technique [0002] Among metal structural materials, magnesium alloy is one of the lighter alloys, with low density, good mechanical properties, and high specific strength and specific stiffness. Magnesium alloy also has the advantages of good dimensional stability, excellent thermal and electrical conductivity, and it is very difficult to form when it is cast into structural parts. Therefore, it is widely used in various aspects of the industrial field, especially in aerospace, electronics and other fields. However, the corrosion resistance and wear resistance of magnesium alloy itself are very poor, which cannot meet the requirements of harsh environments, which limits its application. [0003] At present, the surface protection method of magnesium alloy is mainly to pre...

Claims

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Application Information

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IPC IPC(8): C23C4/129C23C4/06
CPCC23C4/06C23C4/129
Inventor 王善林杨翔麟陈玉华李宏祥黄永德柯黎明张体明
Owner NANCHANG HANGKONG UNIVERSITY
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