2007•Gangtie yanjiu xuebaoRequires access
Modification and Corrosion Resistance of Molybdate Passivation Film on Hot Dip Galvanized Steel Sheet
LU Yan-ping
Open publisher page 0 citations
Abstract
In order to find out a environmental protection chromium-free passivator for hot dip galvanized steel sheet,molybdate passivation film was modified by adding proper H3PO4,SiO2,Ti(Ⅳ) salt addition agent.The surface morphology,component,composition and salt spray resistance were studied with SEM,EDS,XRD and NSS and the mechanism of film formation and corrosion resistance were discussed too.The results showed that modified molybdate passivation film was a kind of compound passivation film and its surface had good white rust resistance which could increase the corrosion resistance of galvanized steel sheet effectively,thereinto protection capability of passivation film formed from Mo-P-Si-Ti system is 5 times higher than hot dip galvanized plate,which is caused by collaboration effect of all components in the passivation film.