Localized corrosion of thermally aged Cu-containing Ni-13Cr-10Fe alloys: The role of Cu enrichment induced grain boundary sensitization

Karthikeyan Hariharan; Longsheng Feng; Kamalnath Kadirvel; Vignesh Karunakaran; Koushik Kosanam; Narasi Sridhar; Yunzhi Wang; Gerald S. Frankel; Eric J. Schindelholz

doi:10.1016/j.corsci.2024.112090

Localized corrosion of thermally aged Cu-containing Ni-13Cr-10Fe alloys: The role of Cu enrichment induced grain boundary sensitization

Karthikeyan Hariharan, Longsheng Feng, Kamalnath Kadirvel, Vignesh Karunakaran, Koushik Kosanam, Narasi Sridhar, Yunzhi Wang, Gerald S. Frankel, Eric J. Schindelholz

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4 Scopus citations

Abstract

This study reports a new mechanism of grain boundary (GB) sensitization without precipitation of Cr-rich phases at GBs in Cu-containing Ni-Cr-Fe alloys. Copper segregation at GBs during annealing can deplete the boundaries of Cr due to the repulsive interaction between Cr and Cu. The depletion of passivating Cr along GBs can cause intergranular corrosion susceptibility, as evidenced by electrochemical testing and post-mortem morphological characterization. The implications of this new sensitization mechanism on the localized corrosion resistance of Cu-containing commercial alloys are discussed.

Original language	English (US)
Article number	112090
Journal	Corrosion Science
Volume	233
DOIs	https://doi.org/10.1016/j.corsci.2024.112090
State	Published - Jun 2024
Externally published	Yes

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Publisher Copyright:
© 2024 The Authors

Keywords

Cu
Grain boundaries
Interfaces
Intergranular corrosion
Precipitates
Segregation

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10.1016/j.corsci.2024.112090

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@article{4a000eace0464ecf8589cf21749c3043,

title = "Localized corrosion of thermally aged Cu-containing Ni-13Cr-10Fe alloys: The role of Cu enrichment induced grain boundary sensitization",

abstract = "This study reports a new mechanism of grain boundary (GB) sensitization without precipitation of Cr-rich phases at GBs in Cu-containing Ni-Cr-Fe alloys. Copper segregation at GBs during annealing can deplete the boundaries of Cr due to the repulsive interaction between Cr and Cu. The depletion of passivating Cr along GBs can cause intergranular corrosion susceptibility, as evidenced by electrochemical testing and post-mortem morphological characterization. The implications of this new sensitization mechanism on the localized corrosion resistance of Cu-containing commercial alloys are discussed.",

keywords = "Cu, Grain boundaries, Interfaces, Intergranular corrosion, Precipitates, Segregation",

author = "Karthikeyan Hariharan and Longsheng Feng and Kamalnath Kadirvel and Vignesh Karunakaran and Koushik Kosanam and Narasi Sridhar and Yunzhi Wang and Frankel, \{Gerald S.\} and Schindelholz, \{Eric J.\}",

note = "Publisher Copyright: {\textcopyright} 2024 The Authors",

year = "2024",

month = jun,

doi = "10.1016/j.corsci.2024.112090",

language = "English (US)",

volume = "233",

journal = "Corrosion Science",

issn = "0010-938X",

publisher = "Elsevier Ltd",

}

TY - JOUR

T1 - Localized corrosion of thermally aged Cu-containing Ni-13Cr-10Fe alloys

T2 - The role of Cu enrichment induced grain boundary sensitization

AU - Hariharan, Karthikeyan

AU - Feng, Longsheng

AU - Kadirvel, Kamalnath

AU - Karunakaran, Vignesh

AU - Kosanam, Koushik

AU - Sridhar, Narasi

AU - Wang, Yunzhi

AU - Frankel, Gerald S.

AU - Schindelholz, Eric J.

PY - 2024/6

Y1 - 2024/6

N2 - This study reports a new mechanism of grain boundary (GB) sensitization without precipitation of Cr-rich phases at GBs in Cu-containing Ni-Cr-Fe alloys. Copper segregation at GBs during annealing can deplete the boundaries of Cr due to the repulsive interaction between Cr and Cu. The depletion of passivating Cr along GBs can cause intergranular corrosion susceptibility, as evidenced by electrochemical testing and post-mortem morphological characterization. The implications of this new sensitization mechanism on the localized corrosion resistance of Cu-containing commercial alloys are discussed.

AB - This study reports a new mechanism of grain boundary (GB) sensitization without precipitation of Cr-rich phases at GBs in Cu-containing Ni-Cr-Fe alloys. Copper segregation at GBs during annealing can deplete the boundaries of Cr due to the repulsive interaction between Cr and Cu. The depletion of passivating Cr along GBs can cause intergranular corrosion susceptibility, as evidenced by electrochemical testing and post-mortem morphological characterization. The implications of this new sensitization mechanism on the localized corrosion resistance of Cu-containing commercial alloys are discussed.

KW - Cu

KW - Grain boundaries

KW - Interfaces

KW - Intergranular corrosion

KW - Precipitates

KW - Segregation

UR - https://www.scopus.com/pages/publications/85192217957

UR - https://www.scopus.com/inward/citedby.url?scp=85192217957&partnerID=8YFLogxK

U2 - 10.1016/j.corsci.2024.112090

DO - 10.1016/j.corsci.2024.112090

M3 - Article

AN - SCOPUS:85192217957

SN - 0010-938X

VL - 233

JO - Corrosion Science

JF - Corrosion Science

M1 - 112090

ER -

Localized corrosion of thermally aged Cu-containing Ni-13Cr-10Fe alloys: The role of Cu enrichment induced grain boundary sensitization

Abstract

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