Microelectrochemistry on CrS and MnS inclusions and its relation with pitting potentials of stainless steels

Izumi Muto, Shimpei Kurokawa, Nobuyoshi Hara

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

1 Citation (Scopus)

Abstract

The anodic dissolution behavior of CrS inclusions was compared with that of MnS inclusions containing around 10 at% Cr, (Mn,Cr)S, using a microelectrochemical cell in NaCl solutions. CrS inclusions were resistant to pit initiation compared with (Mn,Cr)S inclusions. The dissolution potential of CrS inclusions was found to be in the transpassive region of stainless steels. Stable pits were initiated in this potential region. (Mn,Cr)S inclusions dissolved in the passive region of stainless steels, providing lower pitting potentials than those of CrS-containing stainless steels. AES analysis of the surface films on CrS inclusions indicated that chromium-containing oxide films were formed on the CrS inclusions and grew with electrode potential, which suggested the oxide films on CrS inclusions prevented the anodic dissolution of the inclusions, thereby leading to an increased resistance to pit initiation.

Original languageEnglish
Title of host publicationECS Transactions - Critical Factors in Localized Corrosion 6, in Honor of Professor Shibata - 214th ECS Meeting
Pages269-280
Number of pages12
Edition52
DOIs
Publication statusPublished - 2008 Dec 1
EventCritical Factors in Localized Corrosion 6, in Honor of Professor Shibata - 214th ECS Meeting - Honolulu, HI, United States
Duration: 2008 Oct 122008 Oct 17

Publication series

NameECS Transactions
Number52
Volume16
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Other

OtherCritical Factors in Localized Corrosion 6, in Honor of Professor Shibata - 214th ECS Meeting
CountryUnited States
CityHonolulu, HI
Period08/10/1208/10/17

ASJC Scopus subject areas

  • Engineering(all)

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