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SO42-浓度对304不锈钢在NaCl溶液中点蚀行为影响的研究
引用本文:杜楠,田文明,赵晴,孟保利.SO42-浓度对304不锈钢在NaCl溶液中点蚀行为影响的研究[J].材料工程,2012(7):64-70.
作者姓名:杜楠  田文明  赵晴  孟保利
作者单位:1. 南昌航空大学轻合金加工科学与技术国防重点学科实验室,南昌,330063
2. 中航工业西安飞机工业(集团)有限责任公司,西安,710089
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。

关 键 词:304不锈钢  点蚀  激光电子散斑干涉技术  硫酸根离子

Effect of SO42- Concentration on 304 Stainless Steel Pitting Corrosion in NaCl Solution
DU Nan , TIAN Wen-ming , ZHAO Qing , MENG Bao-li.Effect of SO42- Concentration on 304 Stainless Steel Pitting Corrosion in NaCl Solution[J].Journal of Materials Engineering,2012(7):64-70.
Authors:DU Nan  TIAN Wen-ming  ZHAO Qing  MENG Bao-li
Affiliation:1 National Defence Key Discipline Laboratory of Light Alloy Processing Science and Technology Institute,Nanchang Hangkong University,Nanchang 330063,China; 2 AVIC Xi’an Aircraft Industry(Group) Company Ltd.,Xi’an 710089,China)
Abstract:Effect of SO2-4 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 SO2-4 concentration was 0.5%.When the SO2-4 concentration was below 1%,the corrosion resistance was worse than that having no SO2-4.When the SO2-4 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.
Keywords:304 stainless steel  pitting  ESPI  SO2-4
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