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Method for preparing high-corrosion-resistant hot spray coatings for magnesium alloy surfaces

A magnesium alloy and thermal spraying technology, which is applied in the direction of metal material coating process, coating, molten spraying, etc., can solve the problems of magnesium alloy substrate protection and easy corrosion, and achieve simple construction, improved corrosion resistance, high efficiency effect

Inactive Publication Date: 2017-02-22
BEIJING SATELLITE MFG FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low electrode potential of magnesium, about -2.37V, and active chemical properties, magnesium alloys are very easy to form oxide films in the natural atmosphere, and the naturally formed oxide films are loose and porous, which cannot effectively protect the magnesium alloy matrix. One characteristic makes magnesium alloy products prone to corrosion in the links of ground test, transportation, storage, etc.

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  • Method for preparing high-corrosion-resistant hot spray coatings for magnesium alloy surfaces

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preparation example Construction

[0038] Such as figure 1 Shown, a kind of preparation method of the high corrosion resistance thermal spraying coating on magnesium alloy surface, the step of this method comprises:

[0039] (1) Carry out degreasing treatment on the surface of the magnesium alloy material, which can be washed or wiped with gasoline or ethanol;

[0040] (2) Sandblasting the surface of the magnesium alloy material after the degreasing treatment in step (1), the sandblasting grains are corundum, and the particle size is 80 to 120 meshes; the sandblasting air pressure is controlled in the range of 0.2Mpa to 0.5Mpa;

[0041] (3) adopt the method for electric arc thermal spraying to carry out the thermal spraying preparation of metal coating on the magnesium alloy material surface that step (2) obtains;

[0042] The parameters during thermal spraying are: spraying voltage is 30-35V, spraying current is 90-110A, spraying air pressure is 0.7-0.9MPa, spraying distance is 150-350mm, spraying air source ...

Embodiment 1

[0056] A method for preparing a high-corrosion-resistant thermal spray coating on the surface of a magnesium alloy, the steps of the method comprising:

[0057] (1) Degreasing the surface of the magnesium alloy material, and wiping it with gasoline;

[0058] (2) Sandblasting the surface of the magnesium alloy material after the degreasing treatment in step (1), the sandblasting grains are corundum, and the particle size is 120 mesh; the sandblasting air pressure is controlled in the range of 0.3Mpa~0.5Mpa;

[0059] (3) adopt the method for electric arc thermal spraying to carry out the thermal spraying preparation of metal coating on the magnesium alloy material surface that step (2) obtains;

[0060] The parameters during the thermal spraying are: the spraying voltage is 32V, the spraying current is 90A, the spraying air pressure is 0.8MPa, the spraying distance is 250mm, and the spraying gas source is compressed air;

[0061] The raw material adopted in the metal coating is...

Embodiment 2

[0072] A method for preparing a high-corrosion-resistant thermal spray coating on the surface of a magnesium alloy, the steps of the method comprising:

[0073] (1) Degreasing the surface of the magnesium alloy material, and wiping it with gasoline;

[0074] (2) Sandblasting the surface of the magnesium alloy material after the degreasing treatment in step (1), the sandblasting grains are corundum, and the particle size is 100 mesh; the sandblasting air pressure is controlled in the range of 0.2Mpa~0.3Mpa;

[0075] (3) adopt the method for electric arc thermal spraying to carry out the thermal spraying preparation of metal coating on the magnesium alloy material surface that step (2) obtains;

[0076] The parameters during the thermal spraying are: the spraying voltage is 35V, the spraying current is 100A, the spraying air pressure is 0.9MPa, the spraying distance is 300mm, and the spraying gas source is compressed air;

[0077] The raw material used in the metal coating is a...

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Abstract

The invention relates to a method for preparing high-corrosion- resistant hot spray coatings for magnesium alloy surfaces. The method has the advantages that the method mainly aims to meet application requirements of lightweight designs of spacecrafts on magnesium alloy, and corrosion protection requirements on the magnesium alloy in ground test, storage and transportation procedures and the like can be met; the metal protective coatings are sprayed, prepared and formed on the surfaces of magnesium alloy materials by the aid of electric arc wire hot spraying processes and then are subjected to after-treatment and hot treatment, and accordingly the corrosion protection capacity of the coatings can be effectively enhanced.

Description

technical field [0001] The invention relates to a method for preparing a high-corrosion-resistant thermal spray coating on the surface of a magnesium alloy material. This technology is mainly aimed at the application requirements of magnesium alloys in the lightweight design of spacecraft, and meets the requirements of magnesium alloys in the process of ground testing, storage, and transportation. corrosion protection requirements. The metal protective coating is prepared by spraying on the surface of the magnesium alloy material by means of electric arc wire thermal spraying, and then the coating is post-treated and heat-treated to effectively improve the corrosion protection ability of the coating. Background technique [0002] Affected by launch costs, spacecraft structural materials are generally made of lightweight alloys, and commonly used materials are titanium alloys, aluminum alloys, and magnesium alloys. Among them, the density of magnesium alloy is about 1.78g / cm...

Claims

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Application Information

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IPC IPC(8): C23C4/131C23C4/08C23C4/18
CPCC23C4/08C23C4/18
Inventor 张家强白晶莹崔庆新王兵存吕伟娜杨铁山马刚于金花周华珍李力吴琼贺光辉张学
Owner BEIJING SATELLITE MFG FACTORY
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