Surface treatment and coating technology for magnesium alloy surface to resist neutral salt spray test

Abstract

The invention discloses a surface treatment and coating technology for a magnesium alloy surface to resist a neutral salt spray test. The technology comprises the steps of micro-arc oxidation, electrophoresis, spraying of acrylic primer and spraying of organosilicon ceramic composite finish paint, wherein the materials of the organosilicon ceramic composite finish paint include organosilicon coating and nano ceramic coating. In the invention, the magnesium alloy surface is subjected to the surface treatment and coating technology resisting the neutral salt spray test; after the micro-arc oxidation treatment, the electrochemical impedance of the magnesium alloy surface is remarkably improved; and meanwhile, the magnesium alloy micro-arc oxidation protection layer contains a high-temperature change phase, and the film layer has high hardness and toughness and good wear resistance. After the electrophoresis, the film has uniform thickness, strong cohesion and high corrosion resistance and is compatible with multiple finish paints. Particularly, the acrylic resin with strong adhesion, low pollution and low cost can be densely attached to the electrophoretic paint so as to further improve the impact resistance; and after the organosilicon ceramic composite finish paint is sprayed to the surface of the acrylic primer, the magnesium alloy obtains the characteristics of heat and cold resistance, wear resistance, high hardness and the like.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment and relates to a magnesium alloy surface protection technology, in particular to a surface treatment and coating process protection technology for the neutral salt spray test of the magnesium alloy surface. Background technique [0002] Magnesium and magnesium alloy materials have low density, high specific strength and specific stiffness, and excellent electromagnetic shielding and damping performance, etc., so they have been widely used in the automotive, aviation, and electronics industries. With the changes in the output of magnesium and magnesium alloy materials, the price of magnesium metal has dropped significantly, and the advantages of light weight and high strength of magnesium alloy have been highlighted again, making it gradually become the preferred material for lightweight automobiles and motorcycles in the industry. In recent years, although gratifying progress has b...

AI Technical Summary

Problems solved by technology

The purpose of the present invention is to provide a surface treatment and coating process protection technology for magnesium alloy surface resistance to neutral salt spray test, by performing micro-arc oxidation, electrophoresis, spraying acrylic low paint and spraying organic silicon ceramic composite on the surface of magnesium alloy Topcoat, to improve the adhesion of magnesium alloys, improve the hardness of magnesium alloys, corrosion resistance and electrochemical impedance of the film layer, and solve the technical problems that the existing magnesium alloy corrosion and protection have not been well resolved.