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

2021 ◽  
Vol 2 (3) ◽  
pp. 341-359
Author(s):  
Rik-Wouter Bosch ◽  
Marc Vankeerberghen
Keyword(s):  
Experimental Data ◽  
High Temperature ◽  
High Frequency ◽  
Electrochemical Impedance ◽  
Clear Correlation ◽  
Diffuse Double Layer ◽  
Quantitative Correlation ◽  
High Temperature Water ◽  
Eis Measurements ◽  
Temperature Water

Electrochemical Impedance Spectroscopy (EIS) measurements were carried out in high temperature 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. Additionally, it was shown that the high frequency arc of the EIS data was related to the diffuse double layer

Data Compiling and Analysis of Oxide Film Growth on Nickel-Base Alloys in High Temperature Water

2017 ◽  
Author(s):  
Xiangkun Ru ◽  
Zhanpeng Lu ◽  
Junjie Chen ◽  
Hao Peng ◽  
Qi Xiong ◽  
...  
Keyword(s):  
Experimental Data ◽  
High Temperature ◽  
Oxide Film ◽  
Layer Thickness ◽  
Iron Content ◽  
Film Growth ◽  
Alloy Matrix ◽  
High Temperature Water ◽  
Logarithmic Relationship ◽  
Temperature Water

A logarithmic relationship for the oxide film thickness of Nickel-based alloys in high temperature water versus immersion time or dissolved hydrogen (DH) is identified based on the compilation and analysis of the experimental data reported in some literature. A theoretical equation is used to quantify the correlations between thickness and time or DH. The logarithmic correlation between inner layer thickness and iron content in alloy matrix and the linear correlation between outer layer thickness and iron content in alloy matrix are primary identified by fitting the experimental data in our own work. The correlation of oxidation kinetics and stress corrosion cracking growth rate is discussed.

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