Cathodic Protection Design and Protection Effect Evaluation of New Balanced Rudder
The work aims to design and optimize the sacrificial anode protection system for the weak area of galvanic corro-sion 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 sacri-ficial 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 empiri-cal 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 pro-tection 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 pro-tection for the balanced rudder under harsh conditions with a coating failure rate of 20%over three years of service.The opti-mized cathodic protection system reduces the consumption of aluminum anode by 30%,helping to save ship power.
new balanced ruddergalvanic corrosionnumerical simulationsacrificial anode cathodic protectionboundary element methodreal sea test
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