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Journal Articles Electrochimica Acta Year : 2011

Single pit initiation on 316L austenitic stainless steel using scanning electrochemical microscopy

Abstract

Scanning electrochemical microscopy was used to locally release a controlled amount of chloride ions close to a 316L austenitic stainless steel (SS) substrate in sulphuric acid medium to generate a single pit. Then, usual electrochemical techniques were applied for studying the early stages of pit initiation and propagation. The amount of chloride ions needed to reach the requisite threshold concentration for pit initiation was determined. It was found to be higher for SS than for pure iron. The amount of dissolved cations was also determined as a function of the substrate potential. Different pit shapes and depths were observed depending on the potential applied to the substrate. Following the pit repassivation, it was observed that a part of the dissolved products precipitated at the bottom of the pit.

Dates and versions

hal-00824129 , version 1 (21-05-2013)

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Cite

Nizar Aouina, F. Balbaud-Célérier, François Huet, Suzanne Joiret, Hubert Perrot, et al.. Single pit initiation on 316L austenitic stainless steel using scanning electrochemical microscopy. Electrochimica Acta, 2011, 56 (24), pp.8589-8596. ⟨10.1016/j.electacta.2011.07.044⟩. ⟨hal-00824129⟩
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