TY - GEN
T1 - Semiconducting properties of surface oxides formed on austenitic stainless steel
AU - Saadi, Sara Al
AU - Yi, Yongsun
AU - Cho, Pyungyeon
AU - Jang, Changheui
AU - Beeley, Philip
PY - 2015
Y1 - 2015
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85025615990&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:85025615990
T3 - European Corrosion Congress, EUROCORR 2015
SP - 575
EP - 584
BT - European Corrosion Congress, EUROCORR 2015
T2 - European Corrosion Congress, EUROCORR 2015
Y2 - 6 September 2015 through 10 September 2015
ER -