Magnesium alloy no-chromium passivant and use method

Abstract

The invention discloses a magnesium alloy no-chromium passivant and a use method. The passivant comprises a compound and derivative of titanium, a compound and derivative of zirconium, nano particles, thiocarbamide and a silane coupling agent. The compound and derivative of titanium is on or combination of diethanolamine titanate diisopropyl ester and triethanolamine titanate diisopropyl ester, and compound and derivative of zirconium is one or combination of hexafluorozirconic acid, fluotitanic acid and triethanolamine zirconium zirconate, and the silane coupling agent is one or combination of a titanate coupling agent, a zirconic acid coupling agent, a molybdate coupling agent and a vanadate coupling agent. According to the magnesium alloy no-chromium passivant and the use method, the problem that traditional chromium washing causes a large amount of wastewater pollution, and meanwhile the problem that the anti-corrosion protection performance of the no-chromium product to metal and the attaching force performance of a coating cannot achieve the chromizing product effect is solved.

Description

technical field [0001] The invention relates to a passivator and a use method, in particular to a magnesium alloy chromium-free passivator and a use method. Background technique [0002] Magnesium alloy is currently the lightest metal structural material, and its strength is close to that of aluminum alloy. The specific strength is higher than aluminum alloy and steel, slightly lower than the fiber reinforced plastic with the highest specific strength. It has good shock absorption and can withstand large shock and vibration loads. Magnesium alloy is known as the ideal electronic product casing and alternative material for light vehicles in the 21st century. However, magnesium is an extremely active metal with poor corrosion resistance, which restricts the use of magnesium alloys. Therefore, when magnesium alloy is used as a structural material, it must be properly treated to improve its corrosion resistance. [0003] The chemical conversion treatment in the anti-corrosio...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a chromium-free passivator for magnesium alloys and its use method, which can not only solve the problem of a large amount of waste water pollution caused by traditional chromium washing, but also solve the anti-corrosion protection performance of chromium-free products on metals And the problem that the adhesion performance with the coating cannot reach the effect of chromized products

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