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Title: Explanation for initiation of pitting corrosion of stainless steels at sulfide inclusions

Abstract

An explanation for the chemical changes which lead to high-rate dissolution of sulfide inclusions and hence to pit initiation is found in the composition changes induced in the sulfides as the steel cools from the melting temperature of the steel to the solidification temperature of the sulfide. In this temperature regime, on cooling, substantial chromium depletion of the steel may occur around the sulfide, and metallic phases rich in iron and depleted in chromium may precipitate within the inclusion. These chromium-depleted zones can provide the high-rate dissolution which triggers pitting corrosion. Experimental observations on artificial inclusions are supported by thermodynamic calculations.

Authors:
;
Publication Date:
Research Org.:
Univ. Coll. London (GB)
OSTI Identifier:
20080575
Resource Type:
Journal Article
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 147; Journal Issue: 5; Other Information: PBD: May 2000; Journal ID: ISSN 0013-4651
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; STAINLESS STEELS; PITTING CORROSION; INCLUSIONS; SULFIDES; DISSOLUTION; SOLIDIFICATION

Citation Formats

Williams, D.E., and Zhu, Y.Y. Explanation for initiation of pitting corrosion of stainless steels at sulfide inclusions. United States: N. p., 2000. Web. doi:10.1149/1.1393431.
Williams, D.E., & Zhu, Y.Y. Explanation for initiation of pitting corrosion of stainless steels at sulfide inclusions. United States. doi:10.1149/1.1393431.
Williams, D.E., and Zhu, Y.Y. Mon . "Explanation for initiation of pitting corrosion of stainless steels at sulfide inclusions". United States. doi:10.1149/1.1393431.
@article{osti_20080575,
title = {Explanation for initiation of pitting corrosion of stainless steels at sulfide inclusions},
author = {Williams, D.E. and Zhu, Y.Y.},
abstractNote = {An explanation for the chemical changes which lead to high-rate dissolution of sulfide inclusions and hence to pit initiation is found in the composition changes induced in the sulfides as the steel cools from the melting temperature of the steel to the solidification temperature of the sulfide. In this temperature regime, on cooling, substantial chromium depletion of the steel may occur around the sulfide, and metallic phases rich in iron and depleted in chromium may precipitate within the inclusion. These chromium-depleted zones can provide the high-rate dissolution which triggers pitting corrosion. Experimental observations on artificial inclusions are supported by thermodynamic calculations.},
doi = {10.1149/1.1393431},
journal = {Journal of the Electrochemical Society},
issn = {0013-4651},
number = 5,
volume = 147,
place = {United States},
year = {2000},
month = {5}
}