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为充分了解2205双相不锈钢在CO2-H2S-Cl--H2O环境下的耐蚀性能,尤其是其抗点蚀特性,借助计时电流和动电位循环极化测试等手段研究了其钝化动力学特征以及腐蚀特征参数如Ecorr、Epit、Epp、ΔE和Jpass的变化,分析了2205双相不锈钢在含CO2和CO2/H2S的Na Cl溶液中的点蚀差异,并对其点蚀和钝化机理进行了讨论。结果表明,2205双相不锈钢具有优越的抗CO2腐蚀性能,随Cl-浓度增大,发生点腐蚀敏感性提高;随H2S浓度增大,点蚀电位Epit和保护电位Epp均降低,钝化区域稳定性下降,点蚀敏感性进一步提高。
In order to fully understand the corrosion resistance of 2205 duplex stainless steel in CO2-H2S-Cl - H2O environment, especially its pitting corrosion resistance, the passivation kinetics was studied by means of chronoamperometry and potentiodynamic cyclic polarization test The characteristics of corrosion and corrosion parameters such as Ecorr, Epit, Epp, ΔE and Jpass were analyzed. The differences of pitting corrosion of 2205 duplex stainless steel in NaCl solution containing CO2 and CO2 / H2S were analyzed. And its pitting corrosion and passivation mechanism Discussed. The results show that 2205 duplex stainless steel possesses excellent anti-CO2 corrosion resistance. With the increase of Cl- concentration, the susceptibility to point corrosion increases. With the increase of H2S concentration, the pitting potential Epit and the protective potential Epp decrease, while the passivation area is stable Sex decline, pitting sensitivity further improved.