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中国腐蚀与防护学报  2010, Vol. 30 Issue (5): 403-409    
  研究报告 本期目录 | 过刊浏览 |
激光电子散斑干涉技术监测奥氏体不锈钢在NaCl溶液中的点蚀敏感性
徐珊,杜楠,赵晴,叶明阳
南昌航空大学无损检测技术教育部重点实验室 南昌 330063
MONITORING THE PITTING SUSCEPTIBILITY OF AUSTENITIC STAINLESS STEEL IN NaCl SOLUTION BY ELECTRONIC SPECKLE PATTERN INTERFEROMETRY
XU Shan,DU Nan,ZHAO Qing,YE Mingyang
Key Laboratory for NDT Technology of the Ministry of Education, Nanchang Hangkong University, Nanchang 330063
全文: PDF(1413 KB)  
摘要: 用动电位极化和电化学阻抗等方法检测1Cr18Ni9Ti、304和316三种奥氏体不锈钢在3.5%NaCl溶液中的点蚀敏感性;用恒电位下的计时电流法结合激光电子散斑干涉技术(ESPI)实时监测这三种材料在3.5%NaCl溶液中阳极极化过程的表面动态变化及点蚀感应时间(τ)。结果表明,当电极表面发生点蚀时,激光电子散斑干涉图上会出现由点蚀产物扩散引起的亮斑。1Cr18Ni9Ti和 304不锈钢的τ值分别是1 s和9 s,316不锈钢的τ值大于50 s。由此可以判断1Cr18Ni9Ti的点蚀敏感性最大,304居中,316的点蚀敏感性最小。此结果与动电位极化和电化学阻抗等电化学方法得出的结果一致。激光电子散斑干涉技术可以做为一种实验室方法监测金属早期点蚀敏感性。
关键词 奥氏体不锈钢点蚀激光电子散斑干涉技术电化学方法    
Abstract:The pitting susceptibility of 1Cr18Ni9Ti、304 and 316 austenitic stainless steel in 3.5 %NaCl solution was monitored by potential dynamic polarization and electrochemical impedance spectroscope. The pitting induction time (τ) and in-situ changes of electrode surface for the three types of materials in 3.5 %NaCl solution were monitered by electronic speckle pattern interferometry (ESPI) and the chrono amperometry. The results indicated that, bright speckles in ESPI images show pitting corrosion occurring on metal surface. The speckles in ESPI were caused by the pitting corrosion products. The value of pitting induction time (τ) for 1Cr18Ni9Ti and 304 steel were 1 s and 9 s. The value of pitting induction time (τ) for 316 steel was more than 50 s. The results of ESPI showed that, in the 3.5 %NaCl solution, the pitting susceptibility of 1Cr18Ni9Ti was the worst of the three types of materials, and the 316 steel was the best. The result of ESPI was in agreement with that of potential dynamic polarization and electrochemical impedance spectroscope. ESPI can be used as a laboratory technique to monitor the initial pitting susceptibility of metals.
Key wordsaustenitic stainless steel    pitting corrosion    electronic speckle pattern interferometry (ESPI)    electrochemical method
收稿日期: 2009-08-11     
ZTFLH: 

TG142

 
基金资助:

国家自然科学基金项目(50461002)资助

通讯作者: 徐珊     E-mail: d_unan@sina.com
作者简介: 徐珊,女,1984年生,硕士生,研究方向为腐蚀与防护

引用本文:

徐珊,杜楠,赵晴,叶明阳. 激光电子散斑干涉技术监测奥氏体不锈钢在NaCl溶液中的点蚀敏感性[J]. 中国腐蚀与防护学报, 2010, 30(5): 403-409.
XU Shan, DIAO Qing, DU Nan, YE Ming-Yang. MONITORING THE PITTING SUSCEPTIBILITY OF AUSTENITIC STAINLESS STEEL IN NaCl SOLUTION BY ELECTRONIC SPECKLE PATTERN INTERFEROMETRY. J Chin Soc Corr Pro, 2010, 30(5): 403-409.

链接本文:

https://www.jcscp.org/CN/      或      https://www.jcscp.org/CN/Y2010/V30/I5/403

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