4.7 Article

Pitting behavior of SLM 316L stainless steel exposed to chloride environments with different aggressiveness: Pitting mechanism induced by gas pores

Journal

CORROSION SCIENCE
Volume 167, Issue -, Pages -

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2020.108520

Keywords

Stainless steel; EIS; Mott-Schottky; Pitting corrosion; Passive film

Funding

  1. National Key Research and Development Program of China [2017YFB0702300]
  2. National Natural Science Foundation of China [51901216, 51871028]
  3. Fundamental Research Funds for the Central Universities [FRF-TP-17-002B]
  4. China Postdoctoral Science Foundation [2019M652471]

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In this study, the pitting behaviors of wrought and SLM 316L SSs (stainless steels) are comparatively investigated under the conditions of different aggressiveness. The experimental results show that SLM 316L SS exhibits higher sensitivity to pitting corrosion in extremely aggressive solutions, while the wrought sample is more vulnerable to pitting in conditions with low aggressiveness. Gas pores are the pitting-sensitive sites in SLM 316L SS, and metastable pits initiated at covered gas pores are easier to evolve to stable growth compared to open pores due to the greater diffusion resistance.

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