Differentiation of SCC Susceptibility with EIS of Alloy 182 in High Temperature Water

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Abstract

Electrochemical Impedance Spectroscopy (EIS) measurements were carried out in high tempera-ture water with Ni-based Alloy-182. The aim was to correlate the EIS results with differences in Stress Corrosion Cracking (SCC) susceptibility that is present around the Ni-NiO transition. There was a clear difference between the EIS results at and away from the Ni-NiO transition. To make a more quantitative correlation a simple equivalent circuit was used to fit the experimental data. A clear correlation between the CPE exponent (n) and the SCC susceptibility could be obtained. Ad-ditionally, it was shown that the high frequency arc of the EIS data was related to the diffuse double layer

Details

Original languageEnglish
Pages (from-to)341-359
Number of pages19
JournalCorrosion and Materials Degradation
Volume2
Issue number3
DOIs
Publication statusPublished - 16 Jun 2021

Keywords

  • EIS, Ni-based alloys, High temperature water, Oxide layer

ID: 7203380