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Preparing method for composite coating integrating photocatalysis and protection performance of magnesium alloy surface

A technology of composite coating and magnesium alloy, which is applied in the direction of metal material coating process, coating, superimposed layer plating, etc., can solve the problems of limited protection performance and low electrode potential, so as to improve the protection performance and reduce the manufacturing cost , Excellent photocatalytic performance and the effect of anti-corrosion and wear resistance

Inactive Publication Date: 2017-05-10
XIAN TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on the above analysis, micro-arc oxidation technology can form a ceramic layer on the surface of magnesium alloy in situ to improve the performance of the substrate, but the porous structure of the surface of the ceramic layer and the low electrode potential of the ceramic oxide film itself lead to limited protection performance.

Method used

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  • Preparing method for composite coating integrating photocatalysis and protection performance of magnesium alloy surface
  • Preparing method for composite coating integrating photocatalysis and protection performance of magnesium alloy surface
  • Preparing method for composite coating integrating photocatalysis and protection performance of magnesium alloy surface

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Embodiment 1

[0028] In this embodiment, the composite coating on the surface of the magnesium alloy is a cold-sprayed Ti / MAO composite coating, that is, a Ti transition layer is first prepared on the surface of the magnesium alloy substrate and then subjected to micro-arc oxidation. The transition layer utilizes cold spray technology to make the magnesium alloy A Ti overcoating layer with uneven surface characteristics is formed on the surface of the substrate, and the thickness of the transition layer is about 200 µm, and the thickness of the MAO layer formed on the surface is about 10 µm.

[0029] The preparation method of the above-mentioned magnesium alloy surface composite coating comprises the following steps:

[0030] Step 1: The magnesium alloy substrate is mechanically polished, and the Ti coating is prepared by cold spraying process. The particle diameter of the Ti powder used is 6 µm, and nitrogen is the main powder feeding gas. The nitrogen is industrial-grade pure nitrogen, hea...

Embodiment 2

[0036] In this embodiment, the composite coating on the surface of the magnesium alloy is a cold sprayed Ti / V-MAO composite coating, that is, a Ti transition layer is prepared on the surface of the magnesium alloy substrate and then subjected to micro-arc oxidation. The transition layer utilizes cold spray technology to make A Ti overcoating layer with uneven surface characteristics is formed on the surface of the magnesium alloy substrate, and the thickness of the transition layer is about 150 µm. By preparing the micro-arc oxidation electrolyte, a V-doped MAO layer is formed on the surface with a thickness of about 15 µm.

[0037] The preparation method of the above-mentioned magnesium alloy surface composite coating comprises the following steps:

[0038] Step 1: The magnesium alloy substrate is mechanically polished, and the Ti coating is prepared by a cold spraying process. The particle diameter of the Ti powder used is 6 µm, and nitrogen is the main powder feeding gas. Th...

Embodiment 3

[0044] In this embodiment, the composite coating on the surface of the magnesium alloy is a cold sprayed Ti / Sn-MAO composite coating, that is, a Ti transition layer is prepared on the surface of the magnesium alloy substrate and then subjected to micro-arc oxidation. The transition layer utilizes cold spray technology to make A Ti overcoating layer with uneven surface characteristics is formed on the surface of the magnesium alloy substrate, and the thickness of the transition layer is about 250 µm. By preparing the micro-arc oxidation electrolyte, a Sn-doped MAO layer is formed on the surface with a thickness of about 20 µm. .

[0045] The preparation method of the above-mentioned magnesium alloy surface composite coating comprises the following steps:

[0046] Step 1: The magnesium alloy substrate is mechanically polished, and the Ti coating is prepared by cold spraying process. The particle diameter of the Ti powder used is 6 µm, and nitrogen is the main powder feeding gas....

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Abstract

The invention discloses a composite coating integrating photocatalysis and wear resistance of a magnesium alloy surface. The composite coating is composed of a cold spraying Ti coating located on the surface of a magnesium alloy matrix and a titanium oxide layer located on the surface of the Ti coating and prepared through micro-arc oxidation. The cold spraying technology is adopted in the Ti coating so that the Ti coating with the rough surface characteristic is formed on the surface of the magnesium alloy matrix, wherein the thickness of the Ti coating ranges from 100 microns to 300 microns. Micro-arc oxidation is used for preparing the titanium oxide layer with vanadium and tin or without doping of other metal elements, and the titanium oxide layer having photocatalytic activity is obtained through regulation on the electrolyte composition and technological parameters, wherein the thickness of the titanium oxide layer ranges from 6 microns to 20 microns. Compared with an existing magnesium alloy micro-arc oxide layer and a titanium surface micro-arc oxide layer, the composite coating is a film layer having more excellent corrosion-resisting and wear-resisting performance and photocatalytic performance, beneficial modification on the surface of the magnesium alloy matrix can be achieved, application of magnesium alloys in the photocatalytic field is promoted, and the technology can be popularized to modification of surfaces of aluminum alloys.

Description

technical field [0001] The invention relates to the technical field of protective and functional coatings on metal surfaces, in particular to a composite coating with photocatalytic and protective properties on the surface of a magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium alloy has many advantages such as low density, high specific strength and specific stiffness, good dimensional stability, good electromagnetic shielding and good shock absorption. Under the dual pressure of current energy and environment, it has become a high-performance light alloy at home and abroad. Research and development hotspots of materials. my country is rich in magnesium resources, and domestic high-tech fields such as aerospace, as well as automobile, hardware, sanitary ware, information products and other production and manufacturing enterprises have formed a broad application demand situation for magnesium alloy materials. It is obvious to carry out ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/08C25D11/26C23C28/00
CPCC23C24/087C23C28/322C23C28/3455C25D11/024C25D11/26
Inventor 杨巍陈建姚小飞吕煜昆
Owner XIAN TECH UNIV
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