Galvanic Effect between Ferrite and Austenite in 2205 Duplex Stainless Steel
摘 要
利用选择性腐蚀原理制备双相不锈钢(DSS)单相试样, 研究了在3.5% NaCl(质量分数)溶液和2 mol/L H2SO4+0.5 mol/L HCl溶液中铁素体(α)、奥氏体(γ)单相试样的电化学行为差异。结果表明: α相开路电位比γ相的低, 但钝化膜阻抗值比γ相的高;通过宏观电化学方法、微电极及XPS试验对双相不锈钢中α、γ单相间电偶作用进行了研究, 研究发现双相不锈钢两相间存在相互作用, α相促进γ相表面钝化膜稳定性的提升, 且这种作用效果与距离相关。
Abstract
The exclusive ferritic phase (α-phase) and austenitic phase (γ-phase) specimens were prepared on duplex stainless steel (DSS) on the basis of selective dissolution method. The electrochemical behaviors of α-phase and γ-phase in 3.5% NaCl solution and 2 mol/L H2SO4+0.5 mol/L HCl solution were investigated. The results show that the open circuit potential of α-phase was lower than that of γ-phase, while the impedance of α-phase was higher. An electrochemical method, a micro-electrolytic cell arrangement and XPS testing were used for the electrochemical measurements to study the galvanic effect between two phases in DSS. It was found that α-phase contributed to the formation of passive film on γ-phase, so as to improve the corrosion resistance of the duplex stainless steel. The effect between two phases was related to the distance between them.
中图分类号 TG171 DOI 10.11973/fsyfh-201512001
所属栏目 试验研究
基金项目 国家自然科学基金(51271023); 国家基础研究计划项目(2014CB643300)
收稿日期 2014/12/6
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备注程学群(1977-), 副教授, 博士, 从事耐蚀合金腐蚀机制研究,
引用该论文: GUO Qiu-shi,ZHAO Jin-bin,CHENG Xue-qun,WANG Yi. Galvanic Effect between Ferrite and Austenite in 2205 Duplex Stainless Steel[J]. Corrosion & Protection, 2015, 36(12): 1119
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参考文献
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【10】程学群,李晓刚,杜翠薇. 316L不锈钢在含氯高温醋酸溶液中的自钝化行为[J]. 北京科技大学学报,2006,28(9):840-844.
【2】CONRADIA M,SCHNB P M,KOCIJANA A. Surface analysis of localized corrosion of austenitic 316L and duplex 2205 stainless steels in simulated body solutions[J]. Mater Chem Phys,2011,130(1/2):708-713.
【3】ZOU D N,HAN Y,ZHANG W. Phase transformation and its effects on mechanical properties and pitting corrosion resistance of 2205 duplex stainless steel[J]. J Iron Steel Res Int,2010,17(11):67-72.
【4】VIGNAL V,ZHANG H,DELRUE O. Influence of long-term ageing in solution containing chloride ions on the passivity and the corrosion resistance of duplex stainless steels[J]. Corros Sci,2011,53(3):894-903.
【5】LUO H,DONG C F,LI X G, et al. The electrochemical behavior of 2205 duplex stainless steel in alkaline solutions with different pH in the presence of chloride[J]. Electrochim Acta,2012,64(1):211-220.
【6】NAMURATA S,RACHEL P,JINSHAN P. Depletion effects at phase boundaries in 2205 duplex stainless steel characterized with SKPFM and TEM EDS[J]. Corros Sci,2009,51(8):1850-1860.
【7】FEMENIA M,PAN J,LEYGRAF C. In situ study of selective dissolution of duplex stainless steel 2205 by electrochemical scanning tunneling microscopy[J]. Corros Sci,2001,43(1):1939-1951.
【8】I-HSUANG L,FU Y,LIN C J. Effect of electrolyte composition on the active-to-passive transition behavior of 2205 duplex stainless steel in H2SO4/HCl solutions[J]. Corros Sci,2006,48(7):696-708.
【9】TSAI W T,CHEN J R. Galvanic corrosion between the constituent phases in duplex stainless steel[J]. Corros Sci,2007,49(3):3659-3668.
【10】程学群,李晓刚,杜翠薇. 316L不锈钢在含氯高温醋酸溶液中的自钝化行为[J]. 北京科技大学学报,2006,28(9):840-844.
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