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微电化学技术研究双相不锈钢优选腐蚀行为
引用本文:付燕,林昌健,蔡文达.微电化学技术研究双相不锈钢优选腐蚀行为[J].金属学报,2005,41(3):302-306.
作者姓名:付燕  林昌健  蔡文达
作者单位:1. 厦门大学化学系固体表面物理化学国家重点实验室,厦门,361005
2. 成功大学材料科学及工程系,台南
基金项目:国家自然科学基金资助项目20127302
摘    要:利用自制的微参比电极定点测量了双相不锈钢中铁素体相与奥氏体相在NaCl水溶液中的腐蚀电位差异,并建立了微电化学测量系统,在HNO3和FeCl3混合溶液中对双相不锈钢铁素体和奥氏体相分别进行电化学行为和腐蚀差异性的研究.实验表明,铁素体相电位比奥氏体相电位低.微电化学技术的研究结果能够解释双相不锈钢宏观的优选腐蚀行为,有利于进一步深化对双相不锈钢的优选腐蚀机理的认识.

关 键 词:双相不锈钢  单相  微参比电极  优选腐蚀  微电化学系统
文章编号:0412-1961(2005)03-0302-05
收稿时间:2004-04-21
修稿时间:2004-08-20

A study of the selective dissolution behavior of duplex stainless steel by micro-electrochemical technique
FU Yan,LIN Changjian,TSAI Wen-Ta.A study of the selective dissolution behavior of duplex stainless steel by micro-electrochemical technique[J].Acta Metallurgica Sinica,2005,41(3):302-306.
Authors:FU Yan  LIN Changjian  TSAI Wen-Ta
Affiliation:State Key Laboratory for Physical Chemistry of Solid Surfaces, Department of Chemistry,Xiamen University, Xiamen
Abstract:The Ag-AgCl micro-reference electrodes were fabricated and used to determine the potentials of ferrite and austenite in duplex stainless steel in NaCl solutions separately. The result shows that ferrite has lower corrosion potential than that of austenite. To determine the corrosion behavior for the single phases accurately and obtain more information about the selective corrosion, a capillary-based micro electrochemical system was established. The electrochemical determinations of ferrite and austenite were performed respectively in solutions containing nitric acid and FeCl3. According to the results, ferrite has more noble corrosion potential and low current density in 1.5 mol/L HNO3 and 1.5 mol/L HNO3 + 0.5 mol/L FeCl3 solutions, thus selective corrosion occurred in austenite phase, while, in 1.5 mol/L HNO3+O.l mol/L FeCl3 solutions, the potential differences between two phases are not obvious, which result in little selective corrosion.
Keywords:duplex stainless steel  single phase  micro-reference electrode  selective dissolution  micro-electrochemical system
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