Abstract
The morphology and composition of oxide films formed on type 304 stainless steel surfaces exposed to 300°C water at pH 10 have been examined. Emphasis was placed on characterizing the initial stages of oxidation. A correlation was found between oxide film thickness and average crystallite size. The outer, crystalline, part of the oxide was found to be Fe-rich; the inner, amorphous, layer was Cr-rich. Increases in film thickness were found to occur via thickening of the Cr-rich layer. It was also found that chemically pickled surfaces, which were Cr-rich relative to mechanically polished surfaces, were less susceptible to crystallite deposition than the polished surfaces.
Published Version
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