摘要
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%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。
Effect of SO4^2- concentration on 304 stainless steel pitting corrosion in 3.5%NaCl solution was investigated by means of dynamic potential polarization, electrochemical impedance spectroscopy （EIS） and electronic speckle pattern interferometer （ESPI）. The pitting induction time τ under 0.3V （vs SCE） polarization was detected by means of ESPI and chronoamperometry. The results showed that the stainless steel corrosion resistance was the worst when the SO4^2- concentration was 0.5%. When the SO4^2- concentration was below 1%, the corrosion resistance was worse than that having no SO4^2- . When the SO4^2- concentration was beyond 1%, the corrosion resistance was better. The pitting induction time τ of the 304 stainless steel were 4s, 9s and 94s in 0.5%NaCl＋0.5%Na2SO4 solution, 3.5%NaCl solution and 3.5%NaCl＋4%Na2SO4 solution respectively.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2012年第7期64-70,共7页
Journal of Materials Engineering
基金
国家自然科学基金项目(51071083)
