AN EIS STUDY AND AUGER ANALYSIS ON 304L STAINLESS-STEEL IN HOT CHLORIDE MEDIA BEFORE AND AFTER A SAMPLE STRAINING

Interface development of 304L stainless steel in Scheil reagent has be en studied on non-strained samples or on samples subjected to a plasti c straining. Electrochemical impedance spectroscopy (EIS) was used for this work. Continuous changes in the layer formed on the material hav e been observed in this electrolyte. The Auger analyses have shown a v ery different film constitution and thickness before and after straini ng. Inhomogeneities of the film displayed by EIS diagrams have been co nfirmed by the formation of pits observed by SEM.