Blue-white passivator of high-salt-spray-tolerance zinc coating and preparation method and passivating treatment method of blue-white passivator
A technology of passivation treatment and passivating agent, which is applied in the coating process of metal materials, etc., can solve the problems of poor salt spray resistance, complicated process flow, difficult operation and control, etc., so as to prolong the service life, reduce production costs, and improve The effect of film formation speed
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Embodiment 1
[0016] A blue-white passivation agent for highly salt-spray-resistant galvanized layer, using 1L deionized water as solvent, the solute includes the following components: chromium nitrate 10g / L, oxalic acid 2.5g / L, malic acid 2g / L , nitrilotriacetic acid 1.5g / L, potassium hydroxide 3g / L, cobalt nitrate 3g / L, sodium tungstate 0.6g / L, lanthanum nitrate 0.3g / L, γ-aminopropyltriethoxysilane 4g / L .
[0017] The preparation method of the above-mentioned blue-white passivator for the high salt-spray resistant galvanized layer comprises the following steps: (1) first add 300mL deionized water in the reaction vessel, add 10g of chromium nitrate after heating to 55°C and stir until completely dissolved, then Add 2.5g of oxalic acid, 2g of malic acid, 1.5g of nitrilotriacetic acid in turn, and stir thoroughly; (2) Slowly add 3g of potassium hydroxide under constant stirring, then raise the temperature of the solution to 70°C, and stir for 1 hour, then add 3g of cobalt nitrate, 0.6g of s...
Embodiment 2
[0020] A blue-white passivation agent for highly salt-spray-resistant galvanized layer, with 1L deionized water as solvent, the solute includes the following components: chromium nitrate 12g / L, oxalic acid 3.5g / L, malic acid 3g / L , nitrilotriacetic acid 2.5g / L, potassium hydroxide 4g / L, cobalt nitrate 2.5g / L, sodium tungstate 0.6g / L, lanthanum nitrate 0.35g / L, γ-aminopropyltriethoxysilane 2g / L L.
[0021] The preparation method of the above-mentioned blue-white passivator for the high salt-spray resistant galvanized layer comprises the following steps: (1) first add 400mL deionized water in the reaction vessel, add 12g of chromium nitrate after heating to 55°C and stir until completely dissolved, then Add 3.5g oxalic acid, 3g malic acid, and 2.5g nitrilotriacetic acid in sequence, and stir thoroughly; (2) Slowly add 4g potassium hydroxide under constant stirring, then raise the temperature of the solution to 75°C, and stir for 1.5 hours under heat preservation , then add 2.5g...
Embodiment 3
[0024] A blue-white passivation agent for high salt-spray resistant galvanized layer, with 1L deionized water as solvent, the solute includes the following components: chromium nitrate 15g / L, oxalic acid 3g / L, malic acid 3g / L, Nitrilotriacetic acid 2g / L, potassium hydroxide 4g / L, cobalt nitrate 3g / L, sodium tungstate 0.5g / L, lanthanum nitrate 0.4g / L, γ-aminopropyltriethoxysilane 2.2g / L.
[0025] The preparation method of the above-mentioned blue-white passivator for the high salt-spray resistant galvanized layer comprises the following steps: (1) first add 500mL deionized water in the reaction vessel, add 15g of chromium nitrate after heating to 57°C and stir until completely dissolved, then Add 3g of oxalic acid, 3g of malic acid, 2g of nitrilotriacetic acid in sequence, and stir fully; (2) slowly add 4g of potassium hydroxide under continuous stirring, then heat the solution to 75°C, and stir for 2 hours under heat preservation, Then add 3g of cobalt nitrate, 0.5g of sodium ...
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