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材料工程  2012 

SO42-浓度对304不锈钢在NaCl溶液中点蚀行为影响的研究

, PP. 64-70

Keywords: 304不锈钢,点蚀,激光电子散斑干涉技术,硫酸根离子

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Abstract:

利用动电位极化、电化学阻抗谱(EIS)和激光电子散斑干涉(ESPI)研究了3.5%NaCl溶液中,SO42-浓度对304不锈钢点蚀行为的影响。使用0.3V(vsSCE)极化条件下的计时电流法结合ESPI确定了点蚀诱导时间。结果表明当SO42-浓度为0.5%时,不锈钢的耐蚀性最差;当SO42-浓度低于1%时,不锈钢的耐蚀性较不存在SO42-时的耐蚀性差;当SO42-浓度高于1%时,不锈钢的耐蚀性较不存在SO42-时的耐蚀性好。在3.5%NaCl+0.5%Na2SO4溶液中,点蚀诱导时间是4s,在3.5%NaCl溶液中和3.5%NaCl+4%Na2SO4溶液中点蚀诱导时间分别是9s和94s。

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