CATHODIC PROTECTION WITH SACRIFICIAL ANODE FOR SEAWATER BALLAST TANK OF TAIZHOUHAI SHIP

J Chin Soc Corr Pro

1998, Vol. 18

Issue (4): 297-301 DOI:

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CATHODIC PROTECTION WITH SACRIFICIAL ANODE FOR SEAWATER BALLAST TANK OF TAIZHOUHAI SHIP

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Abstract A series of field experiments were made on Taizhouhai ship, whose wing water ballast tanks (WBT) were protected by zinc alloy sacrificial anodes. Various protection current densities were chosen according to the situation of coating, and the protection potentials were monitored by Zn/seawater reference electrodes during first two cycles of immersion. Variations of corrosion rate and protection percentage with protective current density during four year test were investigated. The results indicated that elevated temperature and stress accelerated corrosion. The higher was the protection current density, the lower was the corrosion rate. For the damaged coating, a protection current density of about 200 mA/m2 was suggested, while the protection potential would be lower than 0.15V(vs. Zn/seawater electrode). The higher protection current density for water ballast tank was recommanded.

Key words: Water ballast tank Cathodic protection Protective current density

Received: 25 August 1998

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WU Jian-hua CHEN Ren-xing LIU Guang-zhou CHEN Guang-zhang (Qingdao Branch; Luoyang Ship Material Research Institute; Qingdao 266071)WANG Zhi-xue GUO Wei-hua ZHANG Dian-ping YUN De-cai ZOU Li-qing (Qingdao Ocean Shipping Co.; Qingdao 266071). CATHODIC PROTECTION WITH SACRIFICIAL ANODE FOR SEAWATER BALLAST TANK OF TAIZHOUHAI SHIP. J Chin Soc Corr Pro, 1998, 18(4): 297-301.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1998/V18/I4/297

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