Journal
CORROSION SCIENCE
Volume 91, Issue -, Pages 232-244Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2014.11.018
Keywords
316L stainless steel; SEM; XPS; Pitting corrosion
Funding
- Hundred Talents Program of Chinese Academy of Sciences
- National Natural Science Foundation of China [51371182, U1460202]
- Fundamental Research Funds for the Central Universities [HEUCF201210001]
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The effect of pitting nucleation on critical pitting temperature (CPT) of 316L stainless steel is investigated by electrochemical measurements, morphology observation and XPS analysis. CPT increases dramatically after being passivated by nitric acid, which is mainly attributed to inclusions dissolution and Cr2O3 enrichment in passive film. However, the thickness of passive film is less influential. Pitting nucleation is suppressed through passivation, which leads to the increase of pitting nucleation temperature. Consequently, critical current density (GO shifts to higher temperatures, indicating the enhancement of CPT. In other words, CPT is influenced by both pitting growth chemistry and pitting nucleation. (C) 2014 Elsevier Ltd. All rights reserved.
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