Hot Corrosion of Preoxidized Ni by a Thin Fused Na2 SO 4 Film at 900°C
- 1 January 1990
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 137 (1) , 46-52
- https://doi.org/10.1149/1.2086436
Abstract
The hot corrosion of preoxidized 99% and 99.99% pure Ni covered with a thin film in a gas atmosphere was investigated at 900°C by an electrochemical method using a sodium sensor and an oxygen probe. The preoxidation conditions were varied in order to affect the sulfidation of Ni, which resulted in an increase in salt basicity and thereafter catastrophic corrosion. The basicity gradient generated across the thin salt film supported a self‐sustaining basic fluxing and reprecipitation of the protective scale.Keywords
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