Rare earth and silane as chromate replacers for corrosion protection on galvanized steel
来源期刊：JOURNAL OF RARE EARTHS2009年第1期
论文作者：PENG Tianlan MAN Ruilin
Key words：silane; corrosion; lanthanum; galvanized steel; rare earths;
Abstract: The present work aimed at using rare earth lanthanum salt and trimethoxy(viny)silance as chromate substitutes for galvanized steel passivation, in contrast to zinc coating samples treated with chromate. The corrosion resistance was assessed by electrochemical impedance spectroscopy (EIS) and neutral salt spray tests (NSS). Scanning electron microscopy (SEM) was used to characterize the sample surfaces. The organic coating adhesion on the panel was also investigated via varnishes-cross cut tests. The results indicated that rare earth and silane two-step treatment gave more effective anticorrosion performance than Cr, which also provided good paint adhesion. The coating formation mechanism was also discussed.
PENG Tianlan1，MAN Ruilin1
(1.School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China)
Abstract:The present work aimed at using rare earth lanthanum salt and trimethoxy(viny)silance as chromate substitutes for galvanized steel passivation, in contrast to zinc coating samples treated with chromate. The corrosion resistance was assessed by electrochemical impedance spectroscopy (EIS) and neutral salt spray tests (NSS). Scanning electron microscopy (SEM) was used to characterize the sample surfaces. The organic coating adhesion on the panel was also investigated via varnishes-cross cut tests. The results indicated that rare earth and silane two-step treatment gave more effective anticorrosion performance than Cr, which also provided good paint adhesion. The coating formation mechanism was also discussed.
Key words:silane; corrosion; lanthanum; galvanized steel; rare earths;
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