In situ investigation of local corrosion at interphase boundary under an electrochemical-atomic force microscope

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• 作者：Ning Fu (1)
  Xinhu Tang (1)
  D. Y. Li (1)
  L. Parent (2)
  H. Tian (3)
  
  1. Department of Chemical and Materials Engineering ; University of Alberta ; Edmonton ; AB ; T6G 2V4 ; Canada
  2. Suncor Energy Inc. ; Fort McMurray ; AB ; T9H 3E3 ; Canada
  3. Metallurgical/Materials R&D ; GIW Industries ; Inc. ; Grovetown ; GA ; 30813-2842 ; USA
  
• 关键词：Local corrosion ; EC ; AFM ; High ; Cr cast iron ; In situ investigation
• 刊名：Journal of Solid State Electrochemistry
• 出版年：2015
• 出版时间：February 2015
• 年：2015
• 卷：19
• 期：2
• 页码：337-344
• 全文大小：4,301 KB
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Physical Chemistry
  Analytical Chemistry
  Industrial Chemistry and Chemical Engineering
  Characterization and Evaluation Materials
  Condensed Matter
  Electronic and Computer Engineering
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1433-0768

文摘

Different phases in a multiphase alloy may act as micro-electrodes, resulting in local or internal galvanic corrosion. Using an electrochemical-atomic force microscope (EC-AFM), we investigated local aqueous corrosion of a high-Cr cast iron in spots at different distances from the primary carbide. Results of the study demonstrated that carbides in the cast iron may not act as effective cathodes due to their high electrical resistivity. Instead, the carbide/matrix interfacial mismatch makes the regions in vicinity of the interface highly anodic, which act as anodes while the regions away from the interface act as cathodes. As a result, the corrosion rate at the interface can be considerably larger than that of regions apart away from the interface. Efforts are made to elucidate relevant mechanisms.