在H2SO4+NaCl电解液中采用EPR法评价304不锈钢晶间腐蚀敏化度的变化
Evaluation of Degree of Sensation of 304 Stainless Steel by EPR Method in H2SO4+NaCl Electrolyte
摘 要
引入H2SO4+NaCl电解液采用EPR法测试304不锈钢的晶间腐蚀。通过田口方法对[H2SO4]、[NaCl]、回扫电位U和扫描速度率v等试验参数进行了研究,获得H2SO4+NaCl电解液的优化测试参数为:1.0 mol·L-1 H2SO4+0.5 mol·L-1 NaCl,v=60 mV·min-1,U=300 mV。与现行电解液0.5 mol·L-1 H2SO4+0.01 mol·L-1 KSCN在v=100 mV·min-1,U=300 mV条件下的试验结果进行比较,结合金相研究,结果表明,基于H2SO4+NaCl电解液的EPR法能评价304不锈钢的敏化度,且测试条件更接近304不锈钢的实际腐蚀条件。
晶间腐蚀
H2SO4+NaCl电解液
EPR法
304 stainless steel
intergranular corrosion
H2SO4+NaCl electrolyte
EPR method
Abstract
A new electrochemical potentiodynamie reactivation (EPR) method for evaluating the intergranular corrosion susceptibility of 304 stainless steel was introduced based on H2SO4 + NaCl electrolyte. Some experimental parameters including H2SO4 and NaCl concentration,reverse potential U and scan rate v were examined by Taguchi method. The optimal experimental condition was found to be 1.0 mol·L-1 H2SO4 + 0.5 mol·L-1 NaCl,v=60 mV·min-1,U=300 mV. Compared with the test results under experimental condition of 0.5 mol·L-1 H2SO4 + 0.01 mol·L-1 KSCN electrolyte,v=100 mV·min-1,U= 300 mV and in combination of metallurgical study,it is showed that in the new electrolyte,similar degree of sensation values can be obtained,and the test medium is closer to the practical corrosion environment.
中图分类号 TG174
所属栏目 试验研究
基金项目
收稿日期 2014/3/8
修改稿日期
网络出版日期
作者单位点击查看
备注张根元(1963-),副教授,硕士,从事金属腐蚀相关研究,13915027855.
引用该论文: XIONG Jia-long,ZHANG Gen-yuan,GENG Du-du,XUE Yan. Evaluation of Degree of Sensation of 304 Stainless Steel by EPR Method in H2SO4+NaCl Electrolyte[J]. Corrosion & Protection, 2015, 36(1): 63
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参考文献
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【4】WU T F,TSAI W T. Effect of KSCN and its concentration on the reactivation behavior of sensitized alloy 600 in sulfuric acid solution[J].Corrosion Science,2007,45:267-280.
【5】LOUEKA T,JANOST P. Adsorption and oxidation of thiocyanate on a platinum electrode[J].Elecrrochimica Acro,1996,41(3):405-410.
【6】孙秋霞. 材料腐蚀与防护[M].北京:冶金工业出版社,2001:3.
【7】AMADOU T,BRAHAM C,SIDHOM H. Double loop electrochemical potentiokinetic reactivation test optimization in checking of duplex stainless steel intergranular corrosion susceptibility[J].Metallurgical and Materials Transactions A,2004,35A:3499-3513.
【8】方可伟,刘飞华,李岩. EPR法在评价304L不锈钢晶间腐蚀敏感性中的应用[J].腐蚀与防护,2012,33(10):867-871.
【9】林秀雄. 田口方法实战技术[M].台北:海天出版社,2008:7.
【10】毕新民,曹楚南. pH值和氯离子浓度对铁在酸溶液中的腐蚀电化学行为的影响[J].中国腐蚀与防护学报,1983,3(4):199-216.
【11】梁峰,曹楚南. 铁在含SCN-的高氯酸钠及硫酸钠溶液中的腐蚀电化学行为[J].中国腐蚀与防护学报,1990,10(2):109-118.
【12】黄畯,刘小光,张晓云,等. 电化学动电位再活化法评定不锈钢晶间腐蚀敏感性的研究[J].腐蚀科学与防护技术,1992,4(4):242-249.
【13】金维松,郎宇平,荣凡,等. EPR法评价奥氏体不锈钢晶间腐蚀敏感性的研究[J].中国腐蚀与防护学报,2007,27(1):54-59.
【14】MOJTABA M,MOHAMMAD H M,ALI D. Tuning DOS measuring parameters based on double-loop EPR in H2SO4 containing KSCN by taguchi method[J].Corrosion Science,2010,52:2653-2660.
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