CORROSION RESISTANCE OF ENVIRONMENTAL BLUE PASSIVATION FILM ON Zn ELECTRO-DEPOSITED STEEL SHEETS

The chromate passivation solution was replaced by titanium salt solution to form passivation films on Zn electro-deposited steel sheets and the bright blue passivation film with good corrosion resistance was obtained.Effects of composition of the passivation solution and technical parameters of passivation on corrosion resistance of passivation film were studied by salt spray test,electrochemical test,etc.Corrosion resistance of the blue passivation film obtained in titanium salt solution was superior to that of the chromate passivation.