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) C9-99 - C9-106
DOI http://dx.doi.org/10.1051/jp4:1993907

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) C9-99-C9-106

DOI: 10.1051/jp4:1993907

Protonic defects in oxides and their possible role in high temperature oxidation

Truls Norby

Center for Materials Research, Department of Chemistry, University of Oslo, Gaustadalleen 21, N-0371 Oslo, Norway


Abstract
Protons from hydrogen or water vapour may dissolve in oxides and other corrosion products, and may affect, and in some cases, dominate their defect structures. Defect-dependent properties like scale growth and plastic deformation then become dependent on the ambient hydrogen or water vapour pressure. Small concentrations of protons may enhance the transport of oxygen in the form of hydroxide ion diffusion. Furthermore, the transport of protons through a scale (dissolving as hydrogen in the metal), can replace the outward transport of electrons during scale growth. Recent literature results indicate that protons can be dominant defects in Y2O3, A2O3 and Cr2O3 under certain conditions.



© EDP Sciences 1993