Semiconducting properties of surface oxides formed on austenitic stainless steel

Sara Al Saadi, Yongsun Yi, Pyungyeon Cho, Changheui Jang, Philip Beeley

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


    Using Mott-Schottky analysis technique, semiconducting properties of surface films formed on 316L stainless steel samples that were potentiodynamically polarized up to different ending potentials (Eending) in Ch3COONa and NaCI solutions were investigated. A frequency dependence of Mott-Schottky curves was shown between 1 kHz and 10 kHz frequencies. Also, on the surface films formed on samples potentiodynamically polarized to - 50 and +100 mV (vs. SCE) in NaCI solution, unusual behavior displaying deflection on the curves was observed at 1 kHz frequency. This might be related to pitting initiation. Donor densities in the surface films were calculated by determining the slopes between 1/C2 and the sweep potential during Mott-Schottky analysis. Higher donor densities were obtained in NaCI than in CH3COONa solution. Also, the compositions of the surface films were analyzed by time-of-flight secondary ion mass spectrometry. In this analysis, the depth profiles of chloride ions and oxygen ions in the surface films were determined, which are discussed as a function of the ending potential during potentiodynamic polarization.

    Original languageBritish English
    Title of host publicationEuropean Corrosion Congress, EUROCORR 2015
    Number of pages10
    ISBN (Electronic)9781510837379
    StatePublished - 2015
    EventEuropean Corrosion Congress, EUROCORR 2015 - Graz, Austria
    Duration: 6 Sep 201510 Sep 2015

    Publication series

    NameEuropean Corrosion Congress, EUROCORR 2015


    ConferenceEuropean Corrosion Congress, EUROCORR 2015


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