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Cl-和H2S对不锈钢电化学行为的协同影响

Zhi-guo JIANG,Hui-huang WANG,Li-hua GONG,Guo-ping CHEN,Jian-xin CHEN

Materials Protection（2017）

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Abstract
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.
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Key words
stainless steel,pitting corrosion,H2S,Cl-,electrochemical behavior,combined effects
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