In Situ Investigation of the Role of Hydrogen Evolution on the Estimated Metastable Pit Sizes in an Al-Mg Alloy

Gayathri Sridhar; Nick Birbilis; V. S. Raja

doi:10.5006/3688

In Situ Investigation of the Role of Hydrogen Evolution on the Estimated Metastable Pit Sizes in an Al-Mg Alloy

Gayathri Sridhar, Nick Birbilis, V. S. Raja^*

^*Corresponding author for this work

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

1 Citation (Scopus)

Abstract

The fraction of pit dissolution charge (C_pit) that contributes to hydrogen evolution (HE) occurring within the metastable pits (analyzed in real-time) was determined to evaluate the error it introduces in the metastable pit size estimations derived merely from the analysis of dissolution current. With in situ optical time-lapse imaging, the charge consumed by HE (C_HE) during the current transients was determined from the size of the hydrogen bubbles evolving at the real-time metastable pit locations in an aged Al-Mg alloy. The ratio C_HE/C_pit was observed to range between 0.019 and 0.052 depending on the charge of the transient. This difference was attributed to the catalytic nature of the pit surface that develops as a consequence of the pertinent pitting mechanism.

Original language	English
Pages (from-to)	923-932
Number of pages	10
Journal	Corrosion
Volume	77
Issue number	8
DOIs	https://doi.org/10.5006/3688
Publication status	Published - Aug 2021

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title = "In Situ Investigation of the Role of Hydrogen Evolution on the Estimated Metastable Pit Sizes in an Al-Mg Alloy",

abstract = "The fraction of pit dissolution charge (Cpit) that contributes to hydrogen evolution (HE) occurring within the metastable pits (analyzed in real-time) was determined to evaluate the error it introduces in the metastable pit size estimations derived merely from the analysis of dissolution current. With in situ optical time-lapse imaging, the charge consumed by HE (CHE) during the current transients was determined from the size of the hydrogen bubbles evolving at the real-time metastable pit locations in an aged Al-Mg alloy. The ratio CHE/Cpit was observed to range between 0.019 and 0.052 depending on the charge of the transient. This difference was attributed to the catalytic nature of the pit surface that develops as a consequence of the pertinent pitting mechanism.",

keywords = "aluminum alloy, hydrogen, in situ imaging, metastable pitting",

author = "Gayathri Sridhar and Nick Birbilis and Raja, {V. S.}",

year = "2021",

month = aug,

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language = "English",

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T1 - In Situ Investigation of the Role of Hydrogen Evolution on the Estimated Metastable Pit Sizes in an Al-Mg Alloy

AU - Sridhar, Gayathri

AU - Birbilis, Nick

AU - Raja, V. S.

PY - 2021/8

Y1 - 2021/8

N2 - The fraction of pit dissolution charge (Cpit) that contributes to hydrogen evolution (HE) occurring within the metastable pits (analyzed in real-time) was determined to evaluate the error it introduces in the metastable pit size estimations derived merely from the analysis of dissolution current. With in situ optical time-lapse imaging, the charge consumed by HE (CHE) during the current transients was determined from the size of the hydrogen bubbles evolving at the real-time metastable pit locations in an aged Al-Mg alloy. The ratio CHE/Cpit was observed to range between 0.019 and 0.052 depending on the charge of the transient. This difference was attributed to the catalytic nature of the pit surface that develops as a consequence of the pertinent pitting mechanism.

AB - The fraction of pit dissolution charge (Cpit) that contributes to hydrogen evolution (HE) occurring within the metastable pits (analyzed in real-time) was determined to evaluate the error it introduces in the metastable pit size estimations derived merely from the analysis of dissolution current. With in situ optical time-lapse imaging, the charge consumed by HE (CHE) during the current transients was determined from the size of the hydrogen bubbles evolving at the real-time metastable pit locations in an aged Al-Mg alloy. The ratio CHE/Cpit was observed to range between 0.019 and 0.052 depending on the charge of the transient. This difference was attributed to the catalytic nature of the pit surface that develops as a consequence of the pertinent pitting mechanism.

KW - aluminum alloy

KW - hydrogen

KW - in situ imaging

KW - metastable pitting

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DO - 10.5006/3688

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SN - 0010-9312

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EP - 932

JO - Corrosion

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ER -

In Situ Investigation of the Role of Hydrogen Evolution on the Estimated Metastable Pit Sizes in an Al-Mg Alloy

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