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Effects of Al and Cr Alloying Elements on the Corrosion Behavior of Fe-Al-Cr Alloy System  

Choe Han-Cheol (Department of Dental Materials & Research Center of Nano-Interface Activation for Biomaterials, College of Dentistry, Chosun University)
Publication Information
Journal of the Korean institute of surface engineering / v.38, no.6, 2005 , pp. 241-247 More about this Journal
Abstract
Effects of Al and Cr alloying elements on the corrosion behavior of Fe-Al-Cr alloy system was investigated using potentiodynamic and cyclic potentiodynamic polarization tests(CPPT) in the $H_2SO_4$ and HCI solutions. The corrosion morphologies in Fe-Al-Cr alloy were analysed by utilizing scanning electron microscopy(SEM) and EDX. It was found that the corrosion potential of Fe-20Cr-20Al was highest whereas the critical anodic current density and passive current density were lower than that of the other alloys in 0.1 M $H_2SO_4$ solution. The second anodic peak at 1000 mV disappeared in the case of alloys containing high Al and low Cr contents. Pitting potential increased with increasing Cr content and repassivation potential decreased with decreasing Al content in 0.1 M HCI solution. Fe-Al-Cr alloy containing high Al and Cr contents showed remarkably improved pitting resistance against $Cl^-$ attack from pit morphologies.
Keywords
Fe-Cr-Al Alloy; Potentiodynamic test; CPPT; SEM; EDX; Corrosion; pitting ond repassivation potention;
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