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| Cathodic Protection Design and Protection Effect Evaluation of New Balanced Rudder |
| Received:April 02, 2024 Revised:June 12, 2024 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2024.06.015 |
| KeyWord:new balanced rudder galvanic corrosion numerical simulation sacrificial anode cathodic protection boundary element method real sea test |
| Author | Institution |
| WU Zhengjiang |
Wuhan Second Ship Design and Research Institute, Wuhan , China |
| LI Kaiwei |
National Key Laboratory of Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Shandong Qingdao , China |
| MAO Xuyao |
Wuhan Second Ship Design and Research Institute, Wuhan , China |
| ZHANG Runlin |
Wuhan Second Ship Design and Research Institute, Wuhan , China |
| WU Jian |
Wuhan Second Ship Design and Research Institute, Wuhan , China |
| HOU Jian |
National Key Laboratory of Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Shandong Qingdao , China |
| SONG Qingyuan |
National Key Laboratory of Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Shandong Qingdao , China |
| ZHANG Di |
National Key Laboratory of Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Shandong Qingdao , China |
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| Abstract: |
| The work aims to design and optimize the sacrificial anode protection system for the weak area of galvanic corrosion in the new balanced rudder structure, and evaluate the protection effect. Based on the boundary element method, simulation research of galvanic corrosion of new balanced rudder was carried out to analyze the weak area of galvanic corrosion. The sacrificial anode protection system was designed by empirical method for weak corrosion areas, and the cathodic protection effect was simulated at the initial stage of service and three years after service. The cathodic protection system was optimized based on the effect of coating breakage rate and anode number on the cathodic protection effect. Physical model tests were carried out to evaluate the effect of cathodic protection after optimization. Galvanic corrosion mainly occurred in supporting materials such as shell and base, so strict anti-corrosion measures must be taken. The sacrificial anode protection system designed by the empirical method could make the protection potential of the balanced rudder less than -800 mV at the initial stage of service, and was in a good cathodic protection state. With the depletion of the anode, after three years of service, the cathodic protection system could not provide effective protection for the balanced rudder. The increase of coating breakage rate and the decrease of anode number made the cathodic protection potential of balanced rudder shift positively. The reliability of the optimized cathodic protection model was verified by physical model tests. Compared with the experimental results, the prediction error of the model was less than 5%. The optimized cathodic protection solution of coating +8 sacrificial anodes provides effective cathodic protection for the balanced rudder under harsh conditions with a coating failure rate of 20% over three years of service. The optimized cathodic protection system reduces the consumption of aluminum anode by 30%, helping to save ship power. |
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