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Abstract

Austenitic stainless steels (alloys 304, 316, 310) have been immersed in acidified 15M LiCl solutions at 90°C and analysed by Auger electron spectroscopy. The tarnish films formed on the 304 and 316 steels contain some oxygen, but otherwise have compositiondepth profiles similar to those of dealloyed metallic layers. Minimal tarnishing occurs on the 310 alloy unless thiourea is added or the temperature is raised to 136°C. In all cases the tendency for dealloying is closely related to the tendency for transgranular stress corrosion cracking (SCC) in 15M LiCl solution. The results are consistent with the view that SCC occurs by film induced cleavage, where the film is a dealloyed layer a few tens of nanometres in thickness.

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Evidence for dealloying of austenitic stainless steels in simulated stress corrosion crack environments

Abstract

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