Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 303, Issue 1-2, Pages 173-178Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0921-5093(00)01843-8
Keywords
electrochemical impedance; passive film conductivity; pitting; stainless steel
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The electrochemical impedance was measured over a large range of frequency and under straining condition in sodium chloride solution. The Mott-Schottky analysis, performed at high frequency, appears as very useful method to study the effect of an elastic stress on the capacitance values. The results obtained indicate that the semi-conductive properties of passive films formed on a type 316 L stainless steel (SS) are not markedly modified by an elastic stress when applied after ageing. In contrast, passive films formed in the presence of elastic stress have a higher donor and acceptor concentration than those formed in a stress-free state, suggesting that the passive film conductivity is increased. A decrease of the corrosion resistance of SS may be then expected. The potential barrier at the passive film/electrolyte interface is unchanged, suggesting that kinetics of charge transfer are kept constant. (C) 2001 Elsevier Science B.V. All rights reserved.
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