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,SO24-浓度对304不锈钢点蚀行为的影响.使用0.3V(vs SCE)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SO24-浓度为0.5％时,不锈钢的耐蚀性最差；当SO24-浓度低于1％时,不锈钢的耐蚀性较不存在SO24-时的耐蚀性差；当SO24-浓度高于1％时,不锈钢的耐蚀性较不存在SO24-时的耐蚀性好.在3.5 ％NaCl+0.5％Na2 SO4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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