Abstract
The present work was undertaken with the aim of determining the factors that lead to pitting of stainless steels in the atmosphere. Specimens of Types 430, 304 and 316 stainless steels were inoculated with the solid contaminants alumina, carbon, sodium chloride, ammonium sulphate and ferrous sulphate and exposed to humid atmospheres containing high (100–3000 ppm) and low (0–0.15 ppm) levels of sulphur dioxide. A synergistic effect was found with sulphur dioxide and sodium chloride; in the absence of sulphur dioxide little pitting was found with any of the contaminants investigated, including sodium chloride.
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