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The corrosion behaviors of the as-quenched austenitic Fe-9%Al-30%Mn-(3,5,6.5,8)%Cr-1%C (in mass%) alloys in 3.5 % NaCl solution have been examined. Passivation could be observed for all of the four alloys. The corrosion potential (Ecorr) and pitting potential (Epp) increased pronouncedly as Cr content increased from 3 to 5%, and decreased as Cr content up to 6.5 and 8%. The decrease of Ecorr and Epp of alloys containing 6.5 and 8 % Cr was due to the formation of (Fe,Mn,Cr)7C3 carbides within the austenite matrix and on the grain boundaries. The present result indicates that the Fe-9%Al-30%Mn-5%Cr-1%C alloy exhibited the highest corrosion resistance in 3.5 % NaCl solution. It is worthy to note that the corrosion behaviors of the austenitic FeAlMnCrC alloys with higher Cr (  3%) content have never been reported in previous literature. [doi:10.2320/matertrans.MER2007138

Effect of Chromium Content on Corrosion Behaviors of Fe-9Al-30Mn-(3,5,6.5,8)Cr-1C Alloys