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The passivation and breakdown behavior of 304 stainless steel in propylene carbonate (PC) or dimethoxyethane (DME) mixtures with water and containing 0.5 M LiAsF6 were studied. The air-formed film of 304 stainless steel provides a good passive film that resists breakdown. No pitting was observed in either PCH2O-0.5M LiAsF6 mixtures or mixed DMEH2O-0.5M LiAsF6 solutions if the polarizations were conducted below the oxidation potential [1800mV (sce)] of the hexafluoroarsenate electrolyte. It is apparent that even small amounts of water were sufficient to stabilize the passive film on stainless steel through a probable oxide-oxyhydroxide formation. Pitting of the 304 stainless steel was observed in both mixed organic-water solutions at potentials above the oxidation potential of AsF6− because of the lack of passivating mechanisms such as salt film formation, electropolymerization, or oxide-oxyhydroxide formation.
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Shifler et al. (1995) studied this question.
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