采用电化学阳极循环极化曲线、交流阻抗技术分别研究了3种镍基耐蚀合金在饱和CO2的NaCl溶液中和加入H2S的体系中的电化学腐蚀行为.结果表明：在Cl-浓度为
The corrosion behavior of three Ni-based alloys was investigated in 50 g/L NaCl solution containing H2S/CO2 by polarization curve,anodic circulation curve and electrochemical impedance.The results showed that the pitting potential of different materials had obvious difference in the test conditions,and the pitting potential of Inconel 625 was the highest.Form circulation curves it follows that the Inconel 625 has the least encircled area and higher protection potential,which indicated that the corrosion resistance of Inconel 625 was superior to the others.EIS measurements indicate that the Nyquist plot of the three alloys is composed of single capacitance loop in the solutions without H2S.When H2S coexists with CO2,the plot revealed the corrosion characteristics of diffuse control at low frequencies.The capacitance loop radius of Inconel 625 was correspondingly the biggest.
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