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| IMPRESSED CURRENT CATHODIC PROTECTION OF EXTERNAL TANK BOTTOM WITH SOLID-ELECTROLYTE-CONTAINING COATING |
| Ge Doufu; Zhang Zongwang (East-China Oil Piping Administration) Zhang Chengdian and Xu Naixin (Shanghai Institute of Metallurgy;Chinese Academy of Sciences) |
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Abstract A new approach of impressed current cathodic protection for external tank bottom has been developed. An electronically conducting anode coating was applied on the bituminous sand base for above-ground storage tank, followed by a specially formulated CK coating, which contains the solid electrolyte sodiumβ(β″)alumina as an ionically conducting component. Graphite electrodes were embedded in the CK coating to control and/or monitor the cathode potential. The multilayer structure consisting of external tank bottom, CK coating and anode coating enables the completion of current circuit. An appropriate d.c. power source was used to provide current. Compared with conventional cathodic protection techniques, the new approach has significant advantages. Due to the close proximity of cathodically proretted urface to coating anode, the cathodic protection current would not be lost outwards. As a result, the tank to be protected is not necessarily isolated from neighbouring underground metallic structures. At the same time, it also leads to more uniform distribution of protective potential. The feasibility of the proposed technique has been verified both by small simulating tank and by practical applications. Such a cathodic protection system for an above-ground storage tank of 30-m in diameter by 15.8-m in height has already been in operation successfully for two years.
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Received: 25 April 1992
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Cite this article:
Ge Doufu; Zhang Zongwang (East-China Oil Piping Administration) Zhang Chengdian and Xu Naixin (Shanghai Institute of Metallurgy;Chinese Academy of Sciences). IMPRESSED CURRENT CATHODIC PROTECTION OF EXTERNAL TANK BOTTOM WITH SOLID-ELECTROLYTE-CONTAINING COATING. J Chin Soc Corr Pro, 1992, 12(2): 149-153.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1992/V12/I2/149
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