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

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Abstract

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.

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Acknowledgments

The authors are grateful for financial support from the Natural Science and Engineering Research Council of Canada and AUTO21.

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Authors and Affiliations

  1. Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB, T6G 2V4, Canada

    Ning Fu, Xinhu Tang & D. Y. Li

  2. Suncor Energy Inc., Fort McMurray, AB, T9H 3E3, Canada

    L. Parent

  3. Metallurgical/Materials R&D, GIW Industries, Inc., Grovetown, GA, 30813-2842, USA

    H. Tian

Authors
  1. Ning Fu
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  2. Xinhu Tang
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  3. D. Y. Li
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  4. L. Parent
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  5. H. Tian
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Correspondence to D. Y. Li.

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Fu, N., Tang, X., Li, D.Y. et al. In situ investigation of local corrosion at interphase boundary under an electrochemical-atomic force microscope. J Solid State Electrochem 19, 337–344 (2015). https://doi.org/10.1007/s10008-014-2601-1

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  • DOI: https://doi.org/10.1007/s10008-014-2601-1

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