Fe-Al-Cr계 합금의 부식거동에 미치는 Al 및 Cr 합금원소의 영향
Effects of Al and Cr Alloying Elements on the Corrosion Behavior of Fe-Al-Cr Alloy System
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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 H2SO4 and HCl 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 H2SO4 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 HCl solution. Fe-Al-Cr alloy containing high Al and Cr contents showed remarkably improved pitting resistance against Cl- attack from pit morphologies.
참고문헌 (4)
- "Atlas of Electrochemical Equilibria in Aqueous", pp.168~ (1974)
- "J. of Applied Electrochemistry", pp.803~ (1994)
- "Pitting Corrosion of Metals", pp.144~ (1986)
- "Pitting Corrosion of Metals", pp.136~ (1986)