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Effects of cathodic potential on the local electrochemical environment under a disbonded coating

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Abstract

A rectangular crevice assembly was used to investigate the effects of cathodic protection (CP) potential, bubbling CO2 and surface condition on the crevice corrosion of X70 steel under a disbonded coating. The solution within the crevice becomes more alkaline due to the reduction of dissolved O2. As a result, the potential of the steel reaches the protected potential range and thus the protection distance becomes longer when the applied CP potential is more negative. Potential drop (IR) mainly occurs in the vicinity of the opening. However, the introduction of CO2 into the solution prevents the formation of an alkaline environment but gives rise to an environment with a nearly neutral pH and a uniform potential distribution in the crevice. In addition, it is found that the pre-corrosion product layer significantly decreases the polarization rate in the crevice.

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Abbreviations

CP:

Cathodic protection

SCC:

Stress corrosion cracking

SCE:

Saturated calomel electrode

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Acknowledgements

The authors are grateful for the financial support of National R&D Infrastructure and Facility Development Program of China, whose registered number is 2005DKA10400. The correction of English language by Dr. Chris Marsh is gratefully acknowledged.

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Authors and Affiliations

  1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Xu Chen, Cuiwei Du & Xiaogang Li

  2. Department of Materials, University of Oxford, Oxford, OX1 3PH, UK

    Yizhong Huang

Authors
  1. Xu Chen
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  2. Cuiwei Du
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  3. Xiaogang Li
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  4. Yizhong Huang
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Correspondence to Cuiwei Du.

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Chen, X., Du, C., Li, X. et al. Effects of cathodic potential on the local electrochemical environment under a disbonded coating. J Appl Electrochem 39, 697–704 (2009). https://doi.org/10.1007/s10800-008-9711-3

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