Chromium-free composite passivator for hot-dip galvanized steel sheet and preparation and application methods of composite passivator
A technology of hot-dip galvanized steel sheet and passivation agent, applied in the direction of metal material coating process, etc., can solve the problems of less corrosion resistance than chromate passivation, unable to meet industrial requirements, zinc layer corrosion, etc., to achieve uniform appearance, The effect of low manufacturing cost and stable quality
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Embodiment 1
[0033] The raw material composition of the passivating agent is based on the total mass of 100g, including: 2.20g of water-based phenolic resin, 2.58g of fluozirconic acid (concentration is 46%), 0.08g of KH5500, 0.06g of zirconium sulfate, and 0.10g of zirconium oxychloride octahydrate , nitric acid (concentration is 68%) 0.09g, all the other are distilled water.
[0034] The preparation method of passivating agent: put 80g of distilled water in a beaker, add KH550, stir for about 25 minutes until KH550 is completely hydrolyzed; add fluozirconic acid under stirring; add nitric acid after fluozirconic acid is completely dissolved; measure the solution after nitric acid dissolves pH value; add zirconium sulfate under stirring state, and stir for 10 minutes; after the zirconium sulfate is completely dissolved, add zirconium oxychloride octahydrate, and stir until completely dissolved; after standing for 30 minutes, add water-based phenolic resin, and stir until the resin is compl...
Embodiment 2
[0038] The raw material composition of the passivator is based on the total mass of 100g, including: 2.23g of water-based phenolic resin, 2.60g of fluozirconic acid (concentration is 46%), 0.10g of KH5500, 0.07g of zirconium sulfate, and 0.11g of zirconium oxychloride octahydrate , nitric acid (concentration is 68%) 0.10g, all the other are distilled water.
[0039] The preparation method of passivating agent: put 80g of distilled water in a beaker, add KH550, stir for about 25 minutes until KH550 is completely hydrolyzed; add fluozirconic acid under stirring; add nitric acid after fluozirconic acid is completely dissolved; measure the solution after nitric acid dissolves pH value; add zirconium sulfate under stirring state, and stir for 10 minutes; after the zirconium sulfate is completely dissolved, add zirconium oxychloride octahydrate, and stir until completely dissolved; after standing for 30 minutes, add water-based phenolic resin, and stir until the resin is completely d...
Embodiment 3
[0043] The raw material composition of the passivator is based on the total mass of 100g, including: 2.26g of water-based phenolic resin, 2.62g of fluozirconic acid (concentration is 46%), 0.12g of KH5500, 0.08g of zirconium sulfate, and 0.12g of zirconium oxychloride octahydrate , nitric acid (concentration is 68%) 0.11g, all the other are distilled water.
[0044] The preparation method of passivating agent: put 80g of distilled water in a beaker, add KH550, stir for about 25 minutes until KH550 is completely hydrolyzed; add fluozirconic acid under stirring; add nitric acid after fluozirconic acid is completely dissolved; measure the solution after nitric acid dissolves pH value; add zirconium sulfate under stirring state, and stir for 10 minutes; after the zirconium sulfate is completely dissolved, add zirconium oxychloride octahydrate, and stir until completely dissolved; after standing for 30 minutes, add water-based phenolic resin, and stir until the resin is completely d...
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