Magnesium-alloy surface pre-treatment

Abstract

A pre-treating method for the surface of Mg-alloy includes such steps as sand blasting and cleaning by flushing with clean water or high-pressure air.

Description

technical field [0001] The invention relates to a magnesium alloy surface pretreatment method, in particular to a magnesium alloy surface pretreatment method which is cheap, simple to operate, environmentally friendly and pollution-free, and can effectively improve the adhesion of a vacuum coating on the magnesium alloy surface. Background technique [0002] Due to its small specific gravity, high strength, good thermal conductivity, and good damping and shock absorption and electromagnetic shielding functions, magnesium alloys can replace plastics and be used as shell structural parts. They are used in mobile phones, notebook computers and other electronic products to meet the requirements Requirements for electronic products to be light, thin, short and small. [0003] After the magnesium alloy is die-casted, the surface of the rough blank will be uneven, and there will be burrs and sand holes, which must be processed by workers, such as grinding, deburring and filling san...

AI Technical Summary

Problems solved by technology

[0003] After the magnesium alloy is die-casted, the surface of the rough blank will be uneven, and there will be burrs and sand holes, which must be processed by workers, such as grinding, deburring and filling sand holes. The processing quality is not stable due to the different skills of workers. , and due to the presence of magnesium powder and magnesium chips, the working environment is relatively poor, which affects the health of workers

[0004] Magnesium alloys are very active, and the surface is easily oxidized. However, the oxide film naturally formed on the surface in the atmosphere is loose and porous, and basically has no protective effect. Oxide film, the conventional magnesium alloy adopts the solution containing hexavalent chromium, but the hexavalent chromium is a substance that is harmful to the human body and the environment, and the chromium passivation process will be prohibited.

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