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The passivation behavior of 304 stainless steel in anhydrous propylene carbonate (PC) containing or was studied. The air‐formed film on 304SS is stable up to the oxidation potential of PC . Scratch tests show that the bared 304SS surface repassivates in the anhydrous PC solutions of either electrolyte by chemisorption of PC molecules below . In solutions, the 304SS is not passivated at potentials above . In solutions the 304SS is passive at potentials 400–500 mV above . This is attributed to the formation of a thin metastable perchlorate salt film or an adsorbed layer of perchlorate anions. When the perchlorate anions oxidize, the passivation becomes unstable and pitting occurs. Small (3–8 volume percent) additions of to solutions raises the passive range to the perchlorate oxidation potential. Small quantities of water, propylene glycol, and propylene oxide added to PC slightly improve the passive range of the 304 stainless steel.
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Shifler et al. (1992) studied this question.
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