Journal of The Electrochemical Society · 1982 · 79 citations · 0 references
Natural SciencesMaterials EngineeringMaterials ScienceCorrosion ScienceSurface ChemistrySurface ScienceCorrosion EngineeringCorrosion KineticsCorrosion MechanismsCorrosion TestingCorrosion ThermodynamicsHigh-temperature CorrosionHigh-temperature Corrosion TestingHot CorrosionInduction PeriodOxide Layer FormationOxide Layer MorphologySulfate AttackThermogravimetric CurvesThermogravimetric Data Analysis
Sodium sulfate‐induced hot corrosion of preoxidized B‐1900 and NASA‐TRW VIA has been studied at 900°C with special emphasis placed on the chemical reactions occurring during and immediately after the induction period. Thermogravimetric tests were run for predetermined periods of time after which one set of samples was washed with water. Chemical analysis of the wash solutions yielded information about water‐soluble metal salts and residual sulfate. A second set of samples was run, cross‐sectioned dry, and polished in a nonaqueous medium. Element distributions within the oxide layer were obtained from electron microprobe x‐ray micrographs. A third set of samples was subjected to surface analysis by ESCA. Evolution of was monitored throughout many of the thermogravimetric tests. Results are interpreted in terms of acid‐base fluxing mechanisms.