HIGH PH ENVIRONMENT UNDER DEBONDED COATING ON CATHODIC PROTECTED PIPELINES

J Chin Soc Corr Pro

2004, Vol. 24

Issue (2): 95-99 DOI:

Research Report

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HIGH PH ENVIRONMENT UNDER DEBONDED COATING ON CATHODIC PROTECTED PIPELINES

Maocheng Yan;Yongji Weng

北京石油大学

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Abstract An occluded cell, a DIY antimony mini-electrode and a Ag/AgCl mini-electrode were used to investigate the high pH local environment under debonded coating on cathodic protected pipelines. The effects of the exterior protected potential, cathodic protected current density, blocked resistance, environmental temperature and time on formation of high pH local aqueous environment were analyzed according to the result of the simulation tests. A mathematical model of the pH change of local environment was obtained.

Key words: Cathodic protection pipeline steels debonded coating mini ion-selective electrode ion migration mode

Received: 17 December 2003

ZTFLH:

TG172.9

Corresponding Authors: 石油大学（北京）机电学院材料系 E-mail: yan_maoch@sina.com

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Cite this article:

Maocheng Yan; Yongji Weng. HIGH PH ENVIRONMENT UNDER DEBONDED COATING ON CATHODIC PROTECTED PIPELINES. J Chin Soc Corr Pro, 2004, 24(2): 95-99 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2004/V24/I2/95

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