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| IMPRESSED CURRENT CATHODIC PROTECTION IN ATMOSPHERIC ENVIRONMENT BY MEANS OE A SOLID-ELECTROLYTE-CONTAINING COATING |
| Ge Doufu Zhang Zongwang(East-China Oil Piping Administration)Zhang Chengdian and Xu Naixin(Shanghai Institute of Metallurgy Academia Sinica) |
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Abstract The application of conventional impressed current cathodic protection is restricted to metals which are exposed to aqueous environments. In order to protect cathodically metals against atmospheric corrosion, a special paint is formulated, which contains solid electrolyte sodium-β″(β)-alumina as electrolytically conducting component. The metal object to be protected is coated with the paint and sequentially covercd with auxiliary anode coating, which is an electronic conductor. The sandwich structure of the coating helps to carryout impressed current cathodic protection in atmospheric environments. The inner coating of high ionic conductivity serves as electrical path for protective current. A graphite reference electrode is installed to control the metal potential within a predetermined protective potential range. The additional advantage of the new arrangement is uniform potential distribution due to close proximity of cathodically protected surface to anode coating. The above considerations have been verified by laboratory testsThe practical effectiveness of the new technique has also been demonstrated by the significant suppression of atmospheric corrosion of an overhead pipe.
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Received: 25 April 1989
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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 Academia Sinica). IMPRESSED CURRENT CATHODIC PROTECTION IN ATMOSPHERIC ENVIRONMENT BY MEANS OE A SOLID-ELECTROLYTE-CONTAINING COATING. J Chin Soc Corr Pro, 1989, 9(2): 130-136.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1989/V9/I2/130
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