Corrosion behavior of Ni-20Cr-18W-1Mo superalloy in supercritical water

Jingqing Zhang; Rui Hu; Jian Wang; Jinshan Li

doi:10.1007/s40195-014-0119-2

Corrosion behavior of Ni-20Cr-18W-1Mo superalloy in supercritical water

Jingqing Zhang, Rui Hu, Jian Wang, Jinshan Li

School of Materials Sience and Engineering

Northwestern Polytechnical University Xian

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

4 Scopus citations

Abstract

The corrosion behavior of Ni-20Cr-18 W-1Mo superalloy in supercritical water 500 °C/25 MPa for 200 h is investigated using gravimetry, SEM/EDS, XPS, and TEM. The oxide films show a layered structure with Ni rich in the outer layer, and Cr rich in the inner layer, consisting of an outer Ni(OH)₂ and NiO layer, including some Cr(OH)₃, and an inner Cr₂O₃, NiCr₂O₄, and WO₃ layer. Mo elements are not oxidized. The oxide films grow via a mixed mechanism, namely metal dissolution/oxide precipitation mechanism and solid-state growth mechanism. The effects of secondary and primary carbides on the weight-gain trend and oxide formation are discussed.

Original language	English
Pages (from-to)	1046-1056
Number of pages	11
Journal	Acta Metallurgica Sinica (English Letters)
Volume	27
Issue number	6
DOIs	https://doi.org/10.1007/s40195-014-0119-2
State	Published - 1 Dec 2014

Keywords

Corrosion behavior
Corrosion mechanism
Ni-20Cr-18 W-1Mo
Oxide film
Supercritical water

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10.1007/s40195-014-0119-2

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title = "Corrosion behavior of Ni-20Cr-18W-1Mo superalloy in supercritical water",

abstract = "The corrosion behavior of Ni-20Cr-18 W-1Mo superalloy in supercritical water 500 °C/25 MPa for 200 h is investigated using gravimetry, SEM/EDS, XPS, and TEM. The oxide films show a layered structure with Ni rich in the outer layer, and Cr rich in the inner layer, consisting of an outer Ni(OH)2 and NiO layer, including some Cr(OH)3, and an inner Cr2O3, NiCr2O4, and WO3 layer. Mo elements are not oxidized. The oxide films grow via a mixed mechanism, namely metal dissolution/oxide precipitation mechanism and solid-state growth mechanism. The effects of secondary and primary carbides on the weight-gain trend and oxide formation are discussed.",

keywords = "Corrosion behavior, Corrosion mechanism, Ni-20Cr-18 W-1Mo, Oxide film, Supercritical water",

author = "Jingqing Zhang and Rui Hu and Jian Wang and Jinshan Li",

note = "Publisher Copyright: {\textcopyright} The Chinese Society for Metals and Springer-Verlag Berlin Heidelberg 2014.",

year = "2014",

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doi = "10.1007/s40195-014-0119-2",

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T1 - Corrosion behavior of Ni-20Cr-18W-1Mo superalloy in supercritical water

AU - Zhang, Jingqing

AU - Hu, Rui

AU - Wang, Jian

AU - Li, Jinshan

N1 - Publisher Copyright: © The Chinese Society for Metals and Springer-Verlag Berlin Heidelberg 2014.

PY - 2014/12/1

Y1 - 2014/12/1

N2 - The corrosion behavior of Ni-20Cr-18 W-1Mo superalloy in supercritical water 500 °C/25 MPa for 200 h is investigated using gravimetry, SEM/EDS, XPS, and TEM. The oxide films show a layered structure with Ni rich in the outer layer, and Cr rich in the inner layer, consisting of an outer Ni(OH)2 and NiO layer, including some Cr(OH)3, and an inner Cr2O3, NiCr2O4, and WO3 layer. Mo elements are not oxidized. The oxide films grow via a mixed mechanism, namely metal dissolution/oxide precipitation mechanism and solid-state growth mechanism. The effects of secondary and primary carbides on the weight-gain trend and oxide formation are discussed.

AB - The corrosion behavior of Ni-20Cr-18 W-1Mo superalloy in supercritical water 500 °C/25 MPa for 200 h is investigated using gravimetry, SEM/EDS, XPS, and TEM. The oxide films show a layered structure with Ni rich in the outer layer, and Cr rich in the inner layer, consisting of an outer Ni(OH)2 and NiO layer, including some Cr(OH)3, and an inner Cr2O3, NiCr2O4, and WO3 layer. Mo elements are not oxidized. The oxide films grow via a mixed mechanism, namely metal dissolution/oxide precipitation mechanism and solid-state growth mechanism. The effects of secondary and primary carbides on the weight-gain trend and oxide formation are discussed.

KW - Corrosion behavior

KW - Corrosion mechanism

KW - Ni-20Cr-18 W-1Mo

KW - Oxide film

KW - Supercritical water

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U2 - 10.1007/s40195-014-0119-2

DO - 10.1007/s40195-014-0119-2

M3 - 文章

AN - SCOPUS:84912108712

SN - 1006-7191

VL - 27

SP - 1046

EP - 1056

JO - Acta Metallurgica Sinica (English Letters)

JF - Acta Metallurgica Sinica (English Letters)

IS - 6

ER -

Corrosion behavior of Ni-20Cr-18W-1Mo superalloy in supercritical water

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Keywords

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