Cathodic protection of A1 hull ship |
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Authors: | Zhang Jinglei Sun Keliang Huang Xiuming Yin Jiande Peng Shujie |
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Institution: | (1) Institute of Oceanology, Academia Sinica, Qingdao |
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Abstract: | Heavy paint coating loss and localized corrosion of the Al alloy hull occur red after less than a year's service of a ship
at sea. Examination and analysis showed that the Mg-basic sacrificial anodes originally used for cathodic protection were
not suitable as the resulting −1.3V-plus (vs Ag/AgCl) protection potential for the hull was too negative for the purpose.
A new protection system was designed in which the protection current densities were 15mA/m2 for the hull and 350mA/m2 for the propeller. The hull protection potential under actual condition at sea was between −920mV and −1100mV (Ag/AgCl) and
the protection efficiency was over 90%. The protection areas were calculated by using the formulas A=1.8×LBP×D+BC×LB×B for
the hull and As=2Aas for the propeller.
Contribution No. 1640 from the Institute of Oceanology, Academia Sinica. |
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