Zirconium-manganese-vanadium passivation film treatment agent and treatment method for die-casting aluminum alloy

Abstract

The invention discloses a passive film treating agent for die cast aluminium alloy and a treatment method thereof. The passive film treating agent for die cast aluminium 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 vanadate, 1 to 20 parts of manganate, 1 to 20 parts of calciate and 0.2 to 10 parts of an activating agent. Relative to a traditional phosphorus-containing chromium-free passive film treating agent for die cast aluminium alloy, which causes pollution to the environment, the passive film treating agent for die cast aluminium alloy can form a phosphorus-free chromium-free Zr-Mn-V passive film on the surface of die cast aluminium alloy, the passive film has the advantages that the adhesive force is good, the corrosion resistance is high, and the salt mist resistance and film forming uniformity are good, and besides, the obtained passive film can be guaranteed to have a silver white metal appearance the same as the die cast aluminium alloy.

Description

technical field [0001] The invention relates to the technical field of surface passivation film treatment, in particular to a passivation film treatment agent for die-casting aluminum alloy and a treatment method thereof. Background technique [0002] At present, die-casting aluminum alloy is one of the most widely used non-ferrous metal structural materials in industrial applications. Because it can die-cast workpieces of various shapes and reduce the high cost of CNC engraving process, it has been widely used in industry. Especially the die-casting aluminum alloy of ADC12 model, its performance is even better. For example, the casings of smartphones, mid-boards of smartphones, tablet casings, mid-boards of tablet computers, laptop casings, car audio amplifiers, etc. used in daily life often require the use of die-casting aluminum alloy materials, such as ADC12 models Die-cast aluminum alloy material. [0003] Furthermore, the chemical passivation film treatment of die-ca...

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Problems solved by technology

[0004] However, traditional die-casting aluminum alloy passivation 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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