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

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 ...

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.

Images