Austenitic stainless steels (alloys 304, 316, 310) have been immersed in acidified 15M LiCI 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 deal/oying is closely related. to the tendency for transgranular stress corrosion cracking (SCC) in 15M LiCI solution. The results are consistent with the view that SCC occurs by film induced cleavage, where the film is a dealloyed layer afew tens of nanometres in thickness.
|Original language||English (US)|
|Number of pages||6|
|Journal||British Corrosion Journal|
|State||Published - Jan 1989|
ASJC Scopus subject areas
- Materials Science(all)
- Metals and Alloys