Hydrogen embrittlement of 718 under cathodic polarization

Ramgopal Thodla; Ashwini Chandra; Xiaoji Li; Christopher D. Taylor; Huibin Ke; Narasi Sridhar

doi:10.1016/j.corsci.2019.108361

Hydrogen embrittlement of 718 under cathodic polarization

Ramgopal Thodla^*, Ashwini Chandra, Xiaoji Li, Christopher D. Taylor, Huibin Ke, Narasi Sridhar

^*Corresponding author for this work

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

17 Citations (Scopus)

Abstract

High strength nickel based alloys are extensively used in both O&G and Navy applications. 718 is one of the most commonly used alloys in these applications. Applied cathodic potential had a significant effect on the crack growth rate (CGR) of various grades of 718. Crevice geometry was used to estimate the crack tip pH and potential conditions under cathodic polarization. Density functional theory (DFT) modelling was performed to estimate the water coverage on fresh metal surfaces of 718 under the crack tip conditions. The CGR was related to the estimated water adsorption on fresh metal surfaces in the measured crack tip conditions.

Original language	English
Article number	108361
Journal	Corrosion Science
Volume	165
DOIs	https://doi.org/10.1016/j.corsci.2019.108361
Publication status	Published - 1 Apr 2020
Externally published	Yes

Keywords

718
Cathodic polarization
Crack Growth Rate
Crack tip chemistry
DFT modelling
Hydrogen embrittlement
Hydrogen generation

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10.1016/j.corsci.2019.108361

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title = "Hydrogen embrittlement of 718 under cathodic polarization",

abstract = "High strength nickel based alloys are extensively used in both O&G and Navy applications. 718 is one of the most commonly used alloys in these applications. Applied cathodic potential had a significant effect on the crack growth rate (CGR) of various grades of 718. Crevice geometry was used to estimate the crack tip pH and potential conditions under cathodic polarization. Density functional theory (DFT) modelling was performed to estimate the water coverage on fresh metal surfaces of 718 under the crack tip conditions. The CGR was related to the estimated water adsorption on fresh metal surfaces in the measured crack tip conditions.",

keywords = "718, Cathodic polarization, Crack Growth Rate, Crack tip chemistry, DFT modelling, Hydrogen embrittlement, Hydrogen generation",

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AU - Thodla, Ramgopal

AU - Chandra, Ashwini

AU - Li, Xiaoji

AU - Taylor, Christopher D.

AU - Ke, Huibin

AU - Sridhar, Narasi

PY - 2020/4/1

Y1 - 2020/4/1

N2 - High strength nickel based alloys are extensively used in both O&G and Navy applications. 718 is one of the most commonly used alloys in these applications. Applied cathodic potential had a significant effect on the crack growth rate (CGR) of various grades of 718. Crevice geometry was used to estimate the crack tip pH and potential conditions under cathodic polarization. Density functional theory (DFT) modelling was performed to estimate the water coverage on fresh metal surfaces of 718 under the crack tip conditions. The CGR was related to the estimated water adsorption on fresh metal surfaces in the measured crack tip conditions.

AB - High strength nickel based alloys are extensively used in both O&G and Navy applications. 718 is one of the most commonly used alloys in these applications. Applied cathodic potential had a significant effect on the crack growth rate (CGR) of various grades of 718. Crevice geometry was used to estimate the crack tip pH and potential conditions under cathodic polarization. Density functional theory (DFT) modelling was performed to estimate the water coverage on fresh metal surfaces of 718 under the crack tip conditions. The CGR was related to the estimated water adsorption on fresh metal surfaces in the measured crack tip conditions.

KW - 718

KW - Cathodic polarization

KW - Crack Growth Rate

KW - Crack tip chemistry

KW - DFT modelling

KW - Hydrogen embrittlement

KW - Hydrogen generation

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DO - 10.1016/j.corsci.2019.108361

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VL - 165

JO - Corrosion Science

JF - Corrosion Science

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ER -

Hydrogen embrittlement of 718 under cathodic polarization

Abstract

Keywords

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