One-step method for making colour oxide film on surface of aluminium and aluminum alloy
A technology of aluminum alloy surface and oxide film, which is applied in the direction of surface reaction electrolytic coating, electrolytic coating, coating, etc., can solve the problems of complicated process and strict pretreatment requirements, and achieve simple process, uniform and dense surface, and high wear resistance effect on corrosion resistance
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Embodiment 1
[0016] Put pure aluminum directly in a solution containing sodium silicate concentration 3 g / L, sodium hydroxide concentration 1 g / L, potassium permanganate concentration 2 g / L, sodium molybdate concentration 0.9 g / L, sodium fluorosilicate concentration 3 gram / liter, sodium tungstate concentration 2 grams / liter aqueous solution for oxidation. The oxidation current density is 0.1 A / cm 2 , the temperature is 40°C, and the oxidation time is 0.5 hours, a yellow oxide film can be formed on the surface of pure aluminum.
Embodiment 2
[0018] Put pure aluminum directly in a solution containing sodium silicate concentration 3 g / L, sodium hydroxide concentration 1 g / L, potassium permanganate concentration 2 g / L, sodium molybdate concentration 0.9 g / L, sodium fluorosilicate concentration 3 gram / liter, sodium tungstate concentration 2 grams / liter aqueous solution for oxidation. The oxidation current density is 0.1 A / cm 2 , the temperature is 40°C, and the oxidation time is 1 hour, a brown oxide film can be formed on the surface of pure aluminum.
Embodiment 3
[0020] Put pure aluminum directly in a solution containing sodium silicate concentration 3 g / L, sodium hydroxide concentration 1 g / L, potassium permanganate concentration 2 g / L, sodium molybdate concentration 0.9 g / L, sodium fluorosilicate concentration 3 gram / liter, sodium tungstate concentration 2 grams / liter aqueous solution for oxidation. The oxidation current density is 0.1 A / cm 2 , the temperature is 40°C, and the oxidation time is 1.5 hours, a black oxide film can be formed on the surface of pure aluminum.
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