S22053不锈钢在6%FeCl_3溶液中的点蚀行为
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摘要
采用动电位电化学阻抗谱技术研究了不同电位条件下S22053不锈钢在6%(质量分数)FeCl_3溶液中的点蚀行为。结果表明,电位为0.3～0.9V(SCE,下同)时,S22053不锈钢处于稳定的钝化状态;电位为1.0V时,钝化膜上诱导点蚀;电位为1.1～1.2V时,蚀坑持续扩展,且以向蚀坑深处扩展为主;电位为1.3～1.4V时,新的点蚀在钝化部位诱导产生。点蚀发生后,电化学阻抗谱主要表征蚀坑处的特征。
Pitting behavior of S22053 stainless steel in 6%(mass fraction)FeCl_3 solution under different potential conditions was studied by potentiodynamic electrochemical impedance spectroscopy.The results show that when the potential was 0.3～0.9V(SCE,the same below),S22053 stainless steel was in a stable passivation state;and when the potential was 1.0V,pitting was induced on the passivation film.When the potential was 1.1～1.2V,the etch pit continued to expand,and mainly expanded to the depth of etch pit;and when the potential was 1.3～1.4V,new pitting was induced at the passivation site.After pitting occurred,the electrochemical impedance spectroscopy mainly characterized the characteristics of etch pit.
Pitting behavior of S22053 stainless steel in 6%(mass fraction)FeCl_3 solution under different potential conditions was studied by potentiodynamic electrochemical impedance spectroscopy.The results show that when the potential was 0.3～0.9V(SCE,the same below),S22053 stainless steel was in a stable passivation state;and when the potential was 1.0V,pitting was induced on the passivation film.When the potential was 1.1～1.2V,the etch pit continued to expand,and mainly expanded to the depth of etch pit;and when the potential was 1.3～1.4V,new pitting was induced at the passivation site.After pitting occurred,the electrochemical impedance spectroscopy mainly characterized the characteristics of etch pit.
引文
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[2]曹楚南.腐蚀电化学原理[M].北京:化学工业出版社,2008:237-256.
[3]曹楚南,张鉴清.电化学阻抗谱导论[M].北京:科学出版社,2002:188-191.
[4]杨武,顾濬祥,黎樵燊,等.金属的局部腐蚀[M].北京:化学工业出版社,1995:1-50.
[5]李久青,杜翠薇.腐蚀试验方法及监测技术[M].北京:中国石化出版社,2007:94-99.
[6]杜楠,叶超,田文明,等.304不锈钢点蚀行为的电化学阻抗谱研究[J].材料工程,2014(6):68-73.
[7]叶超.304不锈钢点蚀行为的电化学研究[D].南昌:南昌航空大学,2014.
[8]张胜寒,檀玉,梁可心.电化学阻抗谱法对304不锈钢孔蚀生长和再钝化阶段的原位研究[J].中国腐蚀与防护学报,2011,31(2):130-134.
[9] ASTM G48-11(2015)Standard test methods for pitting and crevice corrosion resistance of stainless steels and related alloys by use of ferric chloride solution[S].
[10] GB/T 17897-2016金属和合金的腐蚀不锈钢三氯化铁点腐蚀试验方法[S].
[11] GB/T 20878-2007不锈钢和耐热钢牌号及化学成分[S].
[12]赵卫民,王勇.电化学阻抗谱法研究热处理对低碳钢镍基合金涂层腐蚀行为的影响[J].金属学报,2008,44(9):1125-1130.
[13]王佳,曹楚南,林海潮.孔蚀发展期的电极阻抗频谱特征[J].中国腐蚀与防护学报,1989,9(4):271-279.
[14]雷永永,张宏玉.金属点蚀行为综述[J].全面腐蚀控制,2016,30(8):11-15.
[15]潘莹,张三平,周建龙,等.金属材料点蚀形核过程研究进展[J].装备环境工程,2010,7(4):67-80.
[16]邓博.多相合金组织演变与电化学失效行为的研究[D].上海:复旦大学,2010.
[17]邓博,蒋益明,龚佳,等.双相不锈钢临界点蚀温度和再钝化温度[J].中国有色金属学报,2007,17(1):47-53.
[18]孙道明,蒋益明,高娟,等.不锈钢点蚀花边盖脱落与稳定生长[J].郑州大学学报(工学版),2009,30(1):70-74.
[19]左禹,符适.非晶态镍合金表面亚稳态蚀孔生长的动力学特种[J].中国腐蚀与防护学报,1997,17(3):161-166.
[20]叶超,杜楠,赵倩,等.不锈钢点蚀行为及研究方法的进展[J].腐蚀与防护,2014,35(3):271-276.