| 摘要 |
PURPOSE: Provided is a chromate solution that can control zinc release from galvanized steel sheet by the addition of KCN to conventional chromate solution, thus improve stability of chromate solution. CONSTITUTION: In a chromate treatment solution containing chromium, nitric acid and sulfate for forming chromate layer on galvanized steel sheet, it is characterized in that KCN is added to chromate solution in amount of 1.0 to 5.0g/L so that zinc ion released to chromate solution is adsorbed onto chromate layer in the form of zinc cyanide complex.
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