A kind of nickel passivation liquid and its preparation method and the method for nickel surface passivation
A passivation solution, metal nickel technology, applied in the direction of metal material coating process, etc., can solve the problems of short salt spray resistance, environmental and human harm, and high hexavalent chromium content, so as to prolong the salt spray resistance time and improve the resistance to salt spray. The effect of acidity and alkalinity
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Embodiment 1
[0019] According to the following formula, first prepare the phosphoric acid aqueous solution, then add chromic anhydride to the phosphoric acid aqueous solution, stir until it is completely dissolved, then add dimethylformamide, stir until it dissolves and let stand, then add methyl triethoxy Silane, to obtain the nickel passivation solution S1 of the present embodiment, its composition is: chromic anhydride 6g / L, phosphoric acid 70g / L, dimethylformamide 40g / L, methyltriethoxysilane 5g / L.
Embodiment 2
[0021] First prepare phosphoric acid aqueous solution according to the following formula, then add chromic anhydride to the phosphoric acid aqueous solution, stir until completely dissolved, then add dimethylformamide, stir until dissolved and let stand, then add methyltriethoxysilane when ready to use , to obtain the nickel passivation solution S2 of the present embodiment, which is composed of: 1 g / L of chromic anhydride, 30 g / L of phosphoric acid, 20 g / L of dimethylformamide, and 1 g / L of methyltriethoxysilane.
Embodiment 3
[0023] First prepare phosphoric acid aqueous solution according to the following formula, then add chromic anhydride to the phosphoric acid aqueous solution, stir until completely dissolved, then add dimethylformamide, stir until dissolved and let stand, then add methyltriethoxysilane when ready to use , to obtain the nickel passivation solution S3 of the present embodiment, which is composed of: 10 g / L of chromic anhydride, 100 g / L of phosphoric acid, 50 g / L of dimethylformamide, and 10 g / L of methyltriethoxysilane.
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