Chromium-free inactivating liquor for continuous galvanizing by hot-dip galvanized steel sheet
A technology of hot-dip galvanized steel sheet and chrome-free passivation, which is applied in the direction of metal material coating process, etc., can solve the problems of high cost, complicated plating solution replenishment and maintenance process, difficult industrialized production, etc., and achieves the effect of low cost.
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Embodiment 1
[0014] Sodium molybdate 3g / L, sodium tungstate 5g / L, tannic acid 3g / L, citric acid 5g / L, hydrogen peroxide 10g / L, sodium silicate 10g / L, phosphoric acid 21g / L as a pH regulator, The remainder is water, and the pH value of the obtained chromium-free passivation solution is 2.4.
Embodiment 2
[0016] Sodium molybdate 4g / L, sodium tungstate 10g / L, tannic acid 12g / L, citric acid 20g / L, hydrogen peroxide 20g / L, sodium silicate 30g / L, phosphoric acid 25g / L as a pH regulator, The remainder is water, and the pH value of the obtained chromium-free passivation solution is 2.0.
Embodiment 3
[0018] Potassium molybdate 5g / L, sodium tungstate 12g / L, tannic acid 15g / L, citric acid 15g / L, hydrogen peroxide 25g / L, potassium silicate 25g / L, phosphoric acid 28g / L, and the rest is water. The pH of the chromium-free passivation solution is 1.7.
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