Magnesium alloy Zr-Ga-V conversion film treating agent and magnesium alloy Zr-Ga-V conversion film treating method

Abstract

The invention relates to a magnesium alloy conversion film treating agent and a magnesium alloy conversion film treating method. The magnesium alloy conversion film treating agent comprises, by mass, 1-20 parts of inorganic acid, 1-20 parts of zirconate, 1-20 parts of calciate, 1-20 parts of vanadate and 0.2-1 part of a dispersing agent. Compared with a traditional phosphorus-containing chromium-free magnesium alloy conversion film treating agent which causes environmental pollution, the magnesium alloy conversion film treating agent adopts 1-20 parts of the inorganic acid, 1-20 parts of the zirconate, 1-20 parts of the calciate, 1-20 parts of the vanadate and 0.2-1 part of the dispersing agent, and thus a phosphorus-free chromium-free Zr-Ga-V conversion film can be formed on the surface of magnesium alloy; and the conversion film has the advantages of being good in adhesive force, high in corrosion resistance degree and good in salt fog resistance and film forming uniformity. The magnesium alloy conversion film treating agent is particularly suitable for a treatment process of a chemical conversion film of die casting magnesium alloy, such as AZ91D magnesium alloy.

Description

technical field [0001] The invention relates to the technical field of magnesium alloy surface conversion coating treatment, in particular to a magnesium alloy conversion coating treatment agent and a magnesium alloy conversion coating treatment method. Background technique [0002] At present, cast magnesium alloy is the most widely used non-ferrous metal structural material in industry, and it has been widely used in industry because of its ability to die-cast workpieces of various shapes. Among them, especially the AZ91D magnesium alloy, its casting performance is excellent. In daily life, the middle board of smart phone, the middle board of tablet computer, the shell of notebook computer, the power amplifier of car audio equipment, etc. often need to use AZ91D magnesium alloy as casting material. [0003] Among them, chemical conversion coating treatment is an indispensable and important link in the pretreatment process of magnesium alloys. However, the conversion coatin...

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Problems solved by technology

[0003] Among them, chemical conversion coating treatment is an indispensable and important link in the pretreatment process of magnesium alloys. However, at present, the conversion coatings of magnesium alloys in industrial production are chromium-free conversion coatings containing phosphoric acid, and a large amount of phosphate and phosphate are discharged in wastewater It is the "culprit" that causes the eutrophication of lakes and other water bodies. Eutrophication refers to the fact that the water contains a large amount of phosphorus, nitrogen and other nutrients needed for plant growth, causing the explosive reproduction of algae and other plankton. Oxygen drops, water quality deteriorates, and fish and other organisms die in large numbers

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