High resolution characterization of Pb-SCC in Alloy 800 exposed to 330 °C mildly caustic environments

S. Y. Persaud; J. M. Smith; C. D. Judge; F. Long; A. Korinek; B. Capell; M. D. Wright

doi:10.1016/j.corsci.2018.05.031

High resolution characterization of Pb-SCC in Alloy 800 exposed to 330 °C mildly caustic environments

S. Y. Persaud
, J. M. Smith
, C. D. Judge
, F. Long
, A. Korinek
, B. Capell
, M. D. Wright

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

25 Scopus citations

Abstract

Alloy 800 was exposed to a 330 °C Pb-containing, mildly caustic (pH_330°C 9.5) environment producing SCC. High resolution analytical TEM characterization of crack tips provided evidence to elucidate the Pb-caustic SCC mechanism and highlight a continuum of classical caustic SCC, facilitated at lower pH by the presence of Pb. Successive regions of Ni-enrichment and Cr-rich oxides were observed along the crack with selective Fe dissolution ahead of crack tips, de-alloying. Also, Pb is observed at oxide-metal interfaces. A hybrid film-rupture/de-alloying SCC mechanism is proposed, with Pb at oxide-metal interfaces acting to impair the passivity of the metastable Cr-rich oxide.

Original language	English
Pages (from-to)	333-348
Number of pages	16
Journal	Corrosion Science
Volume	140
DOIs	https://doi.org/10.1016/j.corsci.2018.05.031
State	Published - Aug 1 2018
Externally published	Yes

Keywords

Alloy
Nickel
PbSCC
Scanning transmission electron microscopy
Stress corrosion

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10.1016/j.corsci.2018.05.031

Cite this

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title = "High resolution characterization of Pb-SCC in Alloy 800 exposed to 330 °C mildly caustic environments",

abstract = "Alloy 800 was exposed to a 330 °C Pb-containing, mildly caustic (pH330°C 9.5) environment producing SCC. High resolution analytical TEM characterization of crack tips provided evidence to elucidate the Pb-caustic SCC mechanism and highlight a continuum of classical caustic SCC, facilitated at lower pH by the presence of Pb. Successive regions of Ni-enrichment and Cr-rich oxides were observed along the crack with selective Fe dissolution ahead of crack tips, de-alloying. Also, Pb is observed at oxide-metal interfaces. A hybrid film-rupture/de-alloying SCC mechanism is proposed, with Pb at oxide-metal interfaces acting to impair the passivity of the metastable Cr-rich oxide.",

keywords = "Alloy, Nickel, PbSCC, Scanning transmission electron microscopy, Stress corrosion",

author = "Persaud, \{S. Y.\} and Smith, \{J. M.\} and Judge, \{C. D.\} and F. Long and A. Korinek and B. Capell and Wright, \{M. D.\}",

note = "Publisher Copyright: {\textcopyright} 2018 Elsevier Ltd",

year = "2018",

month = aug,

day = "1",

doi = "10.1016/j.corsci.2018.05.031",

language = "English",

volume = "140",

pages = "333--348",

journal = "Corrosion Science",

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TY - JOUR

T1 - High resolution characterization of Pb-SCC in Alloy 800 exposed to 330 °C mildly caustic environments

AU - Persaud, S. Y.

AU - Smith, J. M.

AU - Judge, C. D.

AU - Long, F.

AU - Korinek, A.

AU - Capell, B.

AU - Wright, M. D.

PY - 2018/8/1

Y1 - 2018/8/1

N2 - Alloy 800 was exposed to a 330 °C Pb-containing, mildly caustic (pH330°C 9.5) environment producing SCC. High resolution analytical TEM characterization of crack tips provided evidence to elucidate the Pb-caustic SCC mechanism and highlight a continuum of classical caustic SCC, facilitated at lower pH by the presence of Pb. Successive regions of Ni-enrichment and Cr-rich oxides were observed along the crack with selective Fe dissolution ahead of crack tips, de-alloying. Also, Pb is observed at oxide-metal interfaces. A hybrid film-rupture/de-alloying SCC mechanism is proposed, with Pb at oxide-metal interfaces acting to impair the passivity of the metastable Cr-rich oxide.

AB - Alloy 800 was exposed to a 330 °C Pb-containing, mildly caustic (pH330°C 9.5) environment producing SCC. High resolution analytical TEM characterization of crack tips provided evidence to elucidate the Pb-caustic SCC mechanism and highlight a continuum of classical caustic SCC, facilitated at lower pH by the presence of Pb. Successive regions of Ni-enrichment and Cr-rich oxides were observed along the crack with selective Fe dissolution ahead of crack tips, de-alloying. Also, Pb is observed at oxide-metal interfaces. A hybrid film-rupture/de-alloying SCC mechanism is proposed, with Pb at oxide-metal interfaces acting to impair the passivity of the metastable Cr-rich oxide.

KW - Alloy

KW - Nickel

KW - PbSCC

KW - Scanning transmission electron microscopy

KW - Stress corrosion

UR - https://www.scopus.com/pages/publications/85048548526

U2 - 10.1016/j.corsci.2018.05.031

DO - 10.1016/j.corsci.2018.05.031

M3 - Article

AN - SCOPUS:85048548526

SN - 0010-938X

VL - 140

SP - 333

EP - 348

JO - Corrosion Science

JF - Corrosion Science

ER -

High resolution characterization of Pb-SCC in Alloy 800 exposed to 330 °C mildly caustic environments

Abstract

Keywords

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