Potential Distribution Inside a Cathodically Protected Crevice

J Chin Soc Corr Pro

2000, Vol. 20

Issue (3): 129-134 DOI:

Research Report

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Potential Distribution Inside a Cathodically Protected Crevice

Zhengfeng Li;;

武汉大学化学与环境科学学院

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Abstract potential distributions inside a cathodically protected crevice configurated by a top plate and segmented mild steel electrodes were measured in diluted NaCl solutions. The effects of the control potential, solution conductivity and crevice thickness on the potential distribution were studied. The results showed that the potential gradient inside the crevice decreased with elapse of polarization time. In general, the more negative the control potential was and the greater the solution conductivity and crevice thickness were,the more negative the potential inside the crevice was. However, when the control potential was over negative, the cathodic polarization of the steel electrodes in the depth of the crevice might be less than that under a moderate control potential because of hydrogen evolution.

Key words: crevice corrosion carbon steel Cathodic protection potential distribution NaCl solution

Received: 08 July 1999

ZTFLH:

TG174.41

Corresponding Authors: Zhengfeng Li

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Cite this article:

Zhengfeng Li. Potential Distribution Inside a Cathodically Protected Crevice. J Chin Soc Corr Pro, 2000, 20(3): 129-134 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2000/V20/I3/129

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