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Magnesium alloy surface composite coating and preparation method thereof

A surface composite, magnesium alloy technology, applied in the direction of surface reaction electrolytic coating, metal material coating process, coating, etc., can solve the problems of affecting fatigue wear life, corrosion and degradation of parts by diffusion of corrosive medium matrix interface, etc. The effect of load carrying capacity and friction and wear resistance, inhibition of galvanic corrosion, good reliability and service life

Inactive Publication Date: 2019-10-08
UNIV OF SCI & TECH LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the tensile stress state at the interface between the MAO coating and the substrate seriously affects its fatigue wear life, and the porous microstructure of the coating is also very easy to induce the interface diffusion of the corrosive medium substrate and lead to corrosion degradation of parts.

Method used

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  • Magnesium alloy surface composite coating and preparation method thereof
  • Magnesium alloy surface composite coating and preparation method thereof
  • Magnesium alloy surface composite coating and preparation method thereof

Examples

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preparation example Construction

[0036] A method for preparing a composite coating on a magnesium alloy surface, characterized in that it comprises the steps of:

[0037] 1) Grind and polish the sample with metallographic sandpaper to remove surface oxides and pollutants, clean the sample ultrasonically with alcohol for 10 minutes, and then dry it for later use;

[0038] 2) Before spraying, the sample needs to be sandblasted, and the sandblasting particle size is 30 mesh;

[0039] 3) The metal aluminum layer adopts low-pressure supersonic spraying equipment, which does not need to melt the sprayed metal particles, and the temperature generated on the surface of the sprayed substrate does not exceed 150°C;

[0040] The main spraying parameters are as follows: the particle size of aluminum powder is 200-400 mesh, the voltage is 220V, and the pressure is 0.7Pa-0.9Pa.

[0041] 4) Use micro-arc oxidation technology to in-situ grow micro-arc oxidation ceramic coating on the surface of aluminum metal layer. The pre...

Embodiment 1

[0043] The following examples will disclose a gradient composite coating on the surface of a magnesium alloy, including a bottom cold-sprayed intermediate layer as a corrosion medium barrier and a stress buffer zone. The surface is grown in-situ on the intermediate layer by micro-arc oxidation technology with high chemical inertness and mechanical properties. Ceramic coating for strong wear and corrosion protection.

[0044]As a preferred option of the graded composite coating on the surface of the magnesium alloy of the present invention, the bottom middle layer is a cold-sprayed pure metal aluminum layer with a thickness of 300 μm-500 μm.

[0045] As a preferred option of the graded composite coating on the surface of the magnesium alloy of the present invention, the surface carrying layer is a micro-arc oxidation layer with a thickness of 8 μm-12 μm.

[0046] The method for preparing the gradient composite coating on the surface of magnesium alloy in this embodiment compris...

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Abstract

The invention belongs to the technical field of magnesium alloy surface modification, and particularly relates to a magnesium alloy surface composite coating and a preparation method thereof. The magnesium alloy surface composite coating is characterized by comprising an aluminum metal layer and a micro-arc oxidation ceramic coating, wherein the aluminum metal layer is sprayed on the surface of amagnesium alloy matrix through cold spraying technology, and the micro-arc oxidation ceramic coating grows in situ on the aluminum metal layer through micro-arc oxidation technology. According to themagnesium alloy surface composite coating and preparation method thereof, the design of preparing a high-performance AL-MAO composite coating through aluminum cold spraying- micro-arc oxidation composite technology is adopted, the AL-MAO composite coating has a better hardness value than a single pure aluminum coating and a MAO coating, the mechanical property and the bearing capacity of the matrix are obviously improved, and the bearing capacity and the friction and wear resistance ability of the magnesium alloy can be effectively improved; the AL-MAO composite coating has relatively high hardness bearing capacity and better friction and wear resistance ability, is more obvious in improving the friction and wear characteristic of the matrix, and shows better reliability and longer servicelife; and a pure aluminum metal layer is introduced between the matrix and the MAO coating, so that the comprehensive performance of the composite coating is improved.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy surface modification, and in particular relates to a magnesium alloy surface composite coating and a preparation method thereof. Background technique [0002] Magnesium alloy is recognized as the most promising lightweight metal material in the world today. It has a series of advantages such as low density, high strength ratio, good thermal conductivity, excellent damping and shock absorption, electromagnetic shielding, abundant reserves and easy recycling. As the most promising green engineering material in the 21st century, it is being gradually used in automobile manufacturing, electronic communication, aerospace, weapon industry and other fields. However, the high chemical activity of magnesium alloys determines its poor electrochemical corrosion resistance; the low hardness of magnesium alloys determines its weak load-carrying capacity, which easily causes surface wear and failure of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/08C23C28/00C25D11/06
CPCC23C24/087C23C28/322C23C28/345C25D11/026C25D11/06
Inventor 解志文高旭郭锋陈永君冯博吕建建王立宇燕峰胡素影吴迪
Owner UNIV OF SCI & TECH LIAONING
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