Study of Critical Pitting Temperature (CPT) of G3 Alloy under High Temperature and High H<sub>2</sub>S/CO<sub>2</sub> Pressure Environments

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Study of Critical Pitting Temperature (CPT) of G3 Alloy under High Temperature and High H2S/CO2 Pressure Environments
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                        Li DapengLi Dapeng
Institute of Advanced Materials and Technology,University of Science and Technology Beijing
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Zhang LeiZhang Lei
Institute of Advanced Materials and Technology,University of Science and Technology Beijing
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Yue XiaoqiYue Xiaoqi
Institute of Advanced Materials and Technology,University of Science and Technology Beijing
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Liu JiancangLiu Jiancang
Institute of Advanced Materials and Technology,University of Science and Technology Beijing
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Wang ZhuWang Zhu
Institute of Advanced Materials and Technology,University of Science and Technology Beijing
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Lu MinxuLu Minxu
Institute of Advanced Materials and Technology,University of Science and Technology Beijing
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Affiliation:Institute of Advanced Materials and Technology,University of Science and Technology Beijing,Institute of Advanced Materials and Technology,University of Science and Technology Beijing,Institute of Advanced Materials and Technology,University of Science and Technology Beijing,Institute of Advanced Materials and Technology,University of Science and Technology Beijing,Institute of Advanced Materials and Technology,University of Science and Technology Beijing,Institute of Advanced Materials and Technology,University of Science and Technology Beijing
Clc Number:TG174.2
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Abstract:

In this study, critical pitting temperature (CPT) of G3 alloy under high temperature and high H₂S/CO₂ pressure environments was assessed using potentiostatic and electrochemical impedance spectroscopy (EIS) techniques. EIS measurements were carried at anodic potential of 150 mV vs. E_corr and the results were compared with those of potentiostatic polarisation. The results revealed that the CPT of G3 Alloy under high temperature and high H₂S/CO₂ pressure environments was 58.5 _oC in potentiostatic method and between 50-60_oC in EIS method. Both potentiostatic polarization and EIS methods give an almost identical CPT value.

Key words:G3 Alloy; CPT; potentiostatic polarization; EIS

Reference

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[Li Dapeng, Zhang Lei, Yue Xiaoqi, Liu Jiancang, Wang Zhu, Lu Minxu. Study of Critical Pitting Temperature (CPT) of G3 Alloy under High Temperature and High H₂S/CO₂ Pressure Environments[J]. Rare Metal Materials and Engineering,2017,46(8):2144~2148.]
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Received:June 24,2016
Revised:October 30,2016
Adopted:November 11,2016
Online: November 16,2017
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