The effect of sodium hydroxide on niobium carbide precipitates in thermally sensitised 20Cr-25Ni-Nb austenitic stainless steel

Ronald N. Clark; C. M. Chan; Tomas L. Martin; W. S. Walters; Dirk Engelberg; Robert Burrows; Geraint Williams

doi:10.1016/j.corsci.2020.108596

The effect of sodium hydroxide on niobium carbide precipitates in thermally sensitised 20Cr-25Ni-Nb austenitic stainless steel

Ronald N. Clark, C. M. Chan, Tomas L. Martin, W. S. Walters, Dirk Engelberg, Robert Burrows, Geraint Williams

Research output: Contribution to journal › Article (Academic Journal) › peer-review

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Abstract

Niobium-stabilised austenitic stainless steel (20Cr-25Ni-Nb) has been immersed in sodium hydroxide, which is used as a corrosion inhibitor. The work shows how NbC precipitates may be degraded by use of pH 13 NaOH. Initial electrochemical measurements indicate that there is no benefit to this pretreatment as regards long-term corrosion inhibition, and post corrosion imaging shows the initiation of pitting corrosion at Nb-rich precipitates still present in the microstructure.

Original language	English
Article number	108596
Journal	Corrosion Science
Volume	170
Early online date	16 Mar 2020
DOIs	https://doi.org/10.1016/j.corsci.2020.108596
Publication status	Published - 1 Jul 2020

Keywords

A Stainless steel
B AFM
B EIS
B Polarisation
B SEM
C Alkaline corrosion
C Inclusion
C Intergranular corrosion
C Pitting corrosion
SIMS

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title = "The effect of sodium hydroxide on niobium carbide precipitates in thermally sensitised 20Cr-25Ni-Nb austenitic stainless steel",

abstract = "Niobium-stabilised austenitic stainless steel (20Cr-25Ni-Nb) has been immersed in sodium hydroxide, which is used as a corrosion inhibitor. The work shows how NbC precipitates may be degraded by use of pH 13 NaOH. Initial electrochemical measurements indicate that there is no benefit to this pretreatment as regards long-term corrosion inhibition, and post corrosion imaging shows the initiation of pitting corrosion at Nb-rich precipitates still present in the microstructure.",

keywords = "A Stainless steel, B AFM, B EIS, B Polarisation, B SEM, C Alkaline corrosion, C Inclusion, C Intergranular corrosion, C Pitting corrosion, SIMS",

author = "Clark, {Ronald N.} and Chan, {C. M.} and Martin, {Tomas L.} and Walters, {W. S.} and Dirk Engelberg and Robert Burrows and Geraint Williams",

year = "2020",

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doi = "10.1016/j.corsci.2020.108596",

language = "English",

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journal = "Corrosion Science",

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TY - JOUR

T1 - The effect of sodium hydroxide on niobium carbide precipitates in thermally sensitised 20Cr-25Ni-Nb austenitic stainless steel

AU - Clark, Ronald N.

AU - Chan, C. M.

AU - Martin, Tomas L.

AU - Walters, W. S.

AU - Engelberg, Dirk

AU - Burrows, Robert

AU - Williams, Geraint

PY - 2020/7/1

Y1 - 2020/7/1

N2 - Niobium-stabilised austenitic stainless steel (20Cr-25Ni-Nb) has been immersed in sodium hydroxide, which is used as a corrosion inhibitor. The work shows how NbC precipitates may be degraded by use of pH 13 NaOH. Initial electrochemical measurements indicate that there is no benefit to this pretreatment as regards long-term corrosion inhibition, and post corrosion imaging shows the initiation of pitting corrosion at Nb-rich precipitates still present in the microstructure.

AB - Niobium-stabilised austenitic stainless steel (20Cr-25Ni-Nb) has been immersed in sodium hydroxide, which is used as a corrosion inhibitor. The work shows how NbC precipitates may be degraded by use of pH 13 NaOH. Initial electrochemical measurements indicate that there is no benefit to this pretreatment as regards long-term corrosion inhibition, and post corrosion imaging shows the initiation of pitting corrosion at Nb-rich precipitates still present in the microstructure.

KW - A Stainless steel

KW - B AFM

KW - B EIS

KW - B Polarisation

KW - B SEM

KW - C Alkaline corrosion

KW - C Inclusion

KW - C Intergranular corrosion

KW - C Pitting corrosion

KW - SIMS

UR - http://www.scopus.com/inward/record.url?scp=85083855755&partnerID=8YFLogxK

U2 - 10.1016/j.corsci.2020.108596

DO - 10.1016/j.corsci.2020.108596

M3 - Article (Academic Journal)

AN - SCOPUS:85083855755

SN - 0010-938X

VL - 170

JO - Corrosion Science

JF - Corrosion Science

M1 - 108596

ER -

The effect of sodium hydroxide on niobium carbide precipitates in thermally sensitised 20Cr-25Ni-Nb austenitic stainless steel

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The effect of sodium hydroxide on niobium carbide precipitates in thermally sensitised 20Cr-25Ni-Nb austenitic stainless steel

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