目前,对Cl-和H2S共存条件下不锈钢的腐蚀尤其是点蚀行为鲜有研究.采用动电位扫描和交流阻抗测试研究了304,316L和2205 3种不锈钢在含有不同浓度Cl-和H2S的溶液中的电化学行为.结果表明:在含有1 200 mg/L Cl-的溶液中,随H2S浓度增大,304和316L的点蚀敏感性均增大,但此条件下的H2S浓度并未对2205双相不锈钢产生影响.当Cl-浓度增大到1 500 mg/L时,2205产生了点蚀现象,说明虽然H2S促进了不锈钢点蚀的发生,但Cl-是诱导不锈钢产生点蚀的关键因素.
Electrochemical behavior of 304,316L and 2205 stainless steel was studied by potentiodynamic polarization and alternating current impedance (EIS) in the solutions with different concentrations of C1-and H2 S.Results showed that with the increase of H2S concentration,the pitting sensitivity of 304 and 316L stainless steel was increased in the solution containing 1 200 mg/L Cl-.However,under this condition,H2S concentrations did not affect 2205 stainless steel.When the Cl-concentration was increased to 1 500 mg/L,pitting corrosion phenomenon occurred on the 2205 stainless steel,which illustrated that H2S promoted the occurrence of pitting corrosion of stainless steel,while Cl-was the key factor of inducing the pitting corrosion of stainless steel.
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