CORROSION RESISTANCE OF SILANE FILMS FORMED ON HOT-DIP GALVANZIED STEELS

The corrosion resistance of silane films on galvanized steel sheets pretreated by defferent processes was investigated.Salt spray test and polarization curve test results showed that a silane treatment containing 5.0 vol.% vinyltrimethoxysilane could prevent hot-dip galvanized(HDG) steel sheets from white rusting and decrease corrosion rate sharply.The corrosion resistance of the silane films on HDG steel sheets pretreated in NaOH and Ce(NO3)3 solutions was further improved.The films pretreated in Ce(NO3)3 solution could remarkably restrain cathodic and anodic reactions in the corrosion process simultaneously and result in the best corrosion resistance.