Repassivation underneath salt film on stainless steel pits

Li, Tianshu; Frankel, Gerald S.

doi:10.1016/j.corsci.2022.110353

Title: Repassivation underneath salt film on stainless steel pits

Journal Article · Wed May 04 00:00:00 EDT 2022 · Corrosion Science

DOI:https://doi.org/10.1016/j.corsci.2022.110353· OSTI ID:1977038

Li, Tianshu ^[1]; Frankel, Gerald S. ^[1]

The Ohio State Univ., Columbus, OH (United States)

The repassivation temperature (Trp) of one-dimensional artificial pits made from 316L stainless steel was investigated in 3.5 wt.% NaCl by downward temperature scanning. For a given pit depth, T_rp exhibited an unexpected “S” dependence on applied potential. Further analysis shows that this relationship is derived from repassivation underneath the salt film, which is different from repassivation that occurs when the concentration of metal cations at the pit surface decreases below a critical value. This indicates that there exists a reversal in the effect of the salt film on pit growth stability, which depends on temperature, applied potential, and pit depth.

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Research Organization:: The Ohio State Univ., Columbus, OH (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Performance and Design of Nuclear Waste Forms and Containers (WastePD)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0016584

OSTI ID:: 1977038

Alternate ID(s):: OSTI ID: 1867955

Journal Information:: Corrosion Science, Vol. 203, Issue C; ISSN 0010-938X

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

References (23)

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36 MATERIALS SCIENCE
pit growth stability
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critical pitting temperature one-dimensional artificial pit electrode

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