Composition changes around sulphide inclusions in stainless steels, and implications for the initiation of pitting corrosion

David E. Williams; Matt R. Kilburn; John Cliff; Geoffrey I.N. Waterhouse

doi:10.1016/j.corsci.2010.07.021

Composition changes around sulphide inclusions in stainless steels, and implications for the initiation of pitting corrosion

David E. Williams
, Matt R. Kilburn
, John Cliff
, Geoffrey I.N. Waterhouse

Applied Materials Analysis

Research output: Contribution to journal › Article › peer-review

188 Scopus citations

Abstract

We report high-resolution SIMS microscopy measurements, which show that many 'MnS' inclusions have surrounding them a narrow 'halo' of half-width typically 100. nm that is strongly enriched in Fe, forcing consideration of the electrochemistry of FeS as a determinant of the behaviour of the inclusion boundary. We suggest that on exposure to water a very thin and porous metal-deficient polysulphide skin forms between the bulk of the inclusion and the steel, within which a pit can be triggered. The results resolve a controversy concerning the composition of the boundary region around inclusions in stainless steel and re-emphasise its potential significance.

Original language	English
Pages (from-to)	3702-3716
Number of pages	15
Journal	Corrosion Science
Volume	52
Issue number	11
DOIs	https://doi.org/10.1016/j.corsci.2010.07.021
State	Published - Nov 2010

Funding

This work was supported by the University of Auckland and by the Travel and Access Programme of the Australian Microscopy and Microanalysis Research Facility. The authors acknowledge the facilities, scientific and technical assistance of the Australian Microscopy & Microanalysis Research Facility at the Centre for Microscopy, Characterisation & Analysis, the University of Western Australia, a facility funded by The University, State and Commonwealth Governments.

Keywords

A. Stainless steel
B. SIMS
B. XPS
C. Inclusion
C. Pitting corrosion
C. Segregation

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10.1016/j.corsci.2010.07.021

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title = "Composition changes around sulphide inclusions in stainless steels, and implications for the initiation of pitting corrosion",

abstract = "We report high-resolution SIMS microscopy measurements, which show that many 'MnS' inclusions have surrounding them a narrow 'halo' of half-width typically 100. nm that is strongly enriched in Fe, forcing consideration of the electrochemistry of FeS as a determinant of the behaviour of the inclusion boundary. We suggest that on exposure to water a very thin and porous metal-deficient polysulphide skin forms between the bulk of the inclusion and the steel, within which a pit can be triggered. The results resolve a controversy concerning the composition of the boundary region around inclusions in stainless steel and re-emphasise its potential significance.",

keywords = "A. Stainless steel, B. SIMS, B. XPS, C. Inclusion, C. Pitting corrosion, C. Segregation",

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language = "English",

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journal = "Corrosion Science",

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T1 - Composition changes around sulphide inclusions in stainless steels, and implications for the initiation of pitting corrosion

AU - Williams, David E.

AU - Kilburn, Matt R.

AU - Cliff, John

AU - Waterhouse, Geoffrey I.N.

PY - 2010/11

Y1 - 2010/11

N2 - We report high-resolution SIMS microscopy measurements, which show that many 'MnS' inclusions have surrounding them a narrow 'halo' of half-width typically 100. nm that is strongly enriched in Fe, forcing consideration of the electrochemistry of FeS as a determinant of the behaviour of the inclusion boundary. We suggest that on exposure to water a very thin and porous metal-deficient polysulphide skin forms between the bulk of the inclusion and the steel, within which a pit can be triggered. The results resolve a controversy concerning the composition of the boundary region around inclusions in stainless steel and re-emphasise its potential significance.

AB - We report high-resolution SIMS microscopy measurements, which show that many 'MnS' inclusions have surrounding them a narrow 'halo' of half-width typically 100. nm that is strongly enriched in Fe, forcing consideration of the electrochemistry of FeS as a determinant of the behaviour of the inclusion boundary. We suggest that on exposure to water a very thin and porous metal-deficient polysulphide skin forms between the bulk of the inclusion and the steel, within which a pit can be triggered. The results resolve a controversy concerning the composition of the boundary region around inclusions in stainless steel and re-emphasise its potential significance.

KW - A. Stainless steel

KW - B. SIMS

KW - B. XPS

KW - C. Inclusion

KW - C. Pitting corrosion

KW - C. Segregation

UR - https://www.scopus.com/pages/publications/77956262647

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DO - 10.1016/j.corsci.2010.07.021

M3 - Article

AN - SCOPUS:77956262647

SN - 0010-938X

VL - 52

SP - 3702

EP - 3716

JO - Corrosion Science

JF - Corrosion Science

IS - 11

ER -

Composition changes around sulphide inclusions in stainless steels, and implications for the initiation of pitting corrosion

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