Surface treatment method of Mg alloy

Abstract

This invention relates to magnesium alloy surface processing method, the procedures are that a. it is processed by the mixed solution of hydrofluoric acid and sulfuric acid. b. then it is cleaned by pure water to wash surface residual agent. c. it is processed by hydrofluoric acid. d. then it is washed by pure water to wash surface residual agent. e. it is processed by calcium carbonate water solution, so the magnesium alloy surface processing is finished. In this invention, simple etching solution is used to etch the alloy surface at room temperature to make material surface single face, and put an end of corrosion.

Description

technical field [0001] The present invention relates to a surface treatment method for magnesium alloys. The treatment result of the present invention is to remove other phases on the surface of magnesium alloys instead of forming a thin film on the surface, so no special removal procedures are required in the recovery process , has the advantages of no heavy metal pollution, no fluorine (fluorine will destroy the ozone layer and cause the greenhouse effect), and can effectively increase the corrosion resistance of magnesium alloys and facilitate the adhesion of subsequent coatings. Background technique [0002] Magnesium is abundant in nature (1.93% in the earth's crust and 0.13% in the ocean), ranking third in the commonly used structural metals after aluminum and iron, and the proportion of magnesium alloys is the highest among practical structural alloys The lightest (magnesium specific gravity 1.8, aluminum 2.7, titanium 4.5, iron 7.9, copper 8.9, zinc 7.1). Due to the...

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Problems solved by technology

[0013] 1. For the environment: heavy chromium metal wastewater and chromium sludge solidification are not easy to find and buried in the ground-the social and land cost load is too heavy;

[0014] 2. For the user: the heavy metal chromium remaining on the surface of the accessories is precipitated, causing serious pollution to the surrounding environment of the user

[0015] 3. In addition, in the traditional way, a chemical film containing heavy metals and phosphides grows from the surface of the test piece, which will cause heavy metal pollution, fluorine diffusion, etc., and fluorine will destroy the ozone layer and cause the greenhouse effect, etc.

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