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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.48  No.11 (2007)  >  pp.2973-2977

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

Cheng Shun Wang1), Cheng Yao Tsai1), Chuen Guang Chao1) and Tzeng Feng Liu1)
1) Department of Materials Science and Engineering, National Chiao Tung University

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.

austenitic iron aluminum manganese chromium carbon alloys, corrosion resistance alloys, sodium chloride solution, electrochemical polarization

Received: June 20, 2007
Accepted: July 18, 2007 , Published online: October 25, 2007
Copyright (c) 2007 The Japan Institute of Metals



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