G3合金在高温高H2S/CO2环境下临界点蚀温度研究

Study of Critical Pitting Temperature (CPT) of G3 Alloy under High Temperature and High H2S/CO2 Pressure Environments

摘要:

利用恒电位极化和EIS技术研究G3合金在高温高H₂S/CO₂分压环境下的临界点蚀温度。结果表明,利用恒电位极化技术测试G3合金在高温高H₂S/CO₂分压环境下的临界点蚀温度为58.5℃,而利用EIS方法测试得到G3合金在模拟环境下的临界点蚀温度在50-60℃之间,分别利用恒电位极化和EIS方法测试所得G3合金在模拟环境下的的临界点蚀温度基本一致。

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.