EDP Sciences Journals List
Issue J. Phys. IV France
Volume 03, Number C9, Décembre 1993
Proceedings of the 3rd International Symposium on High Temperature Corrosion and Protection of Materials
Actes du 3ème Colloque International sur la Corrosion et la Protection des Matériaux à Haute Température
Page(s) C9-143 - C9-150
DOI http://dx.doi.org/10.1051/jp4:1993912

Proceedings of the 3rd International Symposium on High Temperature Corrosion and Protection of Materials
Actes du 3ème Colloque International sur la Corrosion et la Protection des Matériaux à Haute Température

J. Phys. IV France 03 (1993) C9-143-C9-150

DOI: 10.1051/jp4:1993912

Corrosion of chromium containing alloys in non-steady state environments containing oxygen, carbon, and chlorine

M.J. McNallan, S. Thongtem, J.C. Liu, Y.S. Park and P. Shyu

CEMM Dept., m/c 246, University of Illinois at Chicago, P.O. Box 4348, Chicago, IL 60680, U.S.A.


Abstract
Internal attack of chromium containing alloys in mixed oxygen-chlorine environments occurs by the formation of pores which penetrate down grain boundaries of the alloys. No internal attack was detected in a binary Fe-20 %Cr alloy at 1200 K in environments containing 2500 ppm Cl2. The rate of internal attack of alloy 800H in such environments was increased by replacing the O2 in the gas by CO2. In mixed oxygen-carbon-chlorine environments, the internal attack occurs by selective chlorination of chromium carbides which precipitate along the grain boundaries.



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