Zr-Ti passive film treating agent for aluminum or aluminum alloy and treating method thereof

Abstract

The invention relates to a passive film treating agent for aluminum or aluminum alloy and a treating method thereof. The passive film treating agent for aluminum or aluminum alloy comprises the following components in parts by mass: 1 to 20 parts of inorganic acid, 1 to 20 parts of zirconate, 1 to 20 parts of titanate, 1 to 20 parts of aluminate and 0.2 to 1 part of a dispersing agent. According to the passive film treating agent for aluminum or aluminum alloy, relative to a traditional phosphorus-containing chromium-free passive film treating agent for aluminum or aluminum alloy which causes environmental pollution, the passive film treating agent for aluminum or aluminum alloy has the advantages that through 1 to 20 parts of inorganic acid, 1 to 20 parts of zirconate, 1 to 20 parts of titanate, 1 to 20 parts of aluminate and 0.2 to 1 part of the dispersing agent, a phosphorus-free chromium-free Zr-Ti passive film can be formed on the surface of aluminum or aluminum alloy, the passive film is good in adhesive force, high in corrosion resistance degree and good in salt spray resistance property and film uniformity, and the obtained passive film can be guaranteed to maintain the same silver white metal appearance as aluminum or aluminum alloy.

Description

technical field [0001] The invention relates to the technical field of passivation film treatment on aluminum or aluminum alloy surfaces, in particular to a passivation film treatment agent for aluminum or aluminum alloy and a treatment method thereof. Background technique [0002] At present, aluminum and aluminum alloys are one of the most widely used non-ferrous metal structural materials in industrial applications. Due to their advantages of low density, relatively light weight, and easy processing of various shapes of workpieces, they have been widely used in industrial production. application. For example, aluminum and aluminum alloy materials are often used in smartphone casings, smartphone mid-boards, tablet computer casings, tablet mid-boards, notebook computer casings, and car audio amplifiers that are used in daily life. [0003] Furthermore, chemical passivation film treatment is an indispensable and important link in the pretreatment process of aluminum and alu...

AI Technical Summary

Problems solved by technology

[0004] However, traditional aluminum and aluminum alloy passive film treatment agents usually contain hexavalent chromium and / or trivalent chromium, and during the treatment process, the discharged wastewater will contain hexavalent chromium and trivalent chromium

Because all chromium compounds are toxic, hexavalent chromium is the most toxic, hexavalent chromium is highly carcinogenic, and the toxicity of trivalent chromium is much less than that of hexavalent chromium. Vigorous hexavalent chromium can be transformed into each other during use and storage, which also seriously endangers human health and global biological health

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