Effect of Cr content on pit initiation behavior at MnS inclusions in Fe-Cr steels

Shinpei Asano, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

A microelectrochemical technique was applied to make clear the effect of Cr on the pit initiation behavior at MnS inclusions in Fe- Cr steels. MnS inclusions in Fe-5Cr, 12Cr, and 18Cr steels dissolved around 0 V (vs. Ag/AgCl, 3.33 M KCl), and their dissolution potential regions were independent of Cr contents in the steels. A stable pit was initiated at the inclusions around 0 V on Fe-5Cr and 12Cr in 0.1 M NaCl. In the case of Fe-5Cr, after the stable pit initiation, the surface dissolution was started from the pit. In contrast, no surface dissolution was observed on Fe-12Cr, even though the stable pit was generated. In micro-scale polarization, no stable pit was initiated at MnS inclusions on Fe-18Cr. Only metastable pitting was observed around 0 V. The repassivation ability of Fe-Cr alloys has an important role in the pitting events at MnS inclusions.

Original languageEnglish
Title of host publicationECS Transactions
EditorsH. Habazaki, K. Azumi, A. W. Hassel, K. Hebert
PublisherElectrochemical Society Inc.
Pages9-20
Number of pages12
Edition27
ISBN (Electronic)9781607687764
DOIs
Publication statusPublished - 2016
EventOxide Films: A Symposium in Honor of Masahiro Seo - PRiME 2016/230th ECS Meeting - Honolulu, United States
Duration: 2016 Oct 22016 Oct 7

Publication series

NameECS Transactions
Number27
Volume75
ISSN (Print)1938-6737
ISSN (Electronic)1938-5862

Other

OtherOxide Films: A Symposium in Honor of Masahiro Seo - PRiME 2016/230th ECS Meeting
Country/TerritoryUnited States
CityHonolulu
Period16/10/216/10/7

ASJC Scopus subject areas

  • Engineering(all)

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