Research On Whole Lifecycle Corrosion Prevention Design Of Ship

With the upsizing and complicated development tendency of ship,it's safety problem becomes more important.Ship faces corrosion problem during it's whole lifecycle and corrosion may cause serious accident.The two corrosion protection methods of ship are anticorrosive coating and cathodic protection. As time goes on,the performance of anticorrosive coating gets worse,weaken the anti-corrosion effect.Traditional cathodic protection usually uses empirical equation to design cathodic protection parameters. This design method can't make flexible and reliable design to adapt the change of anticorrosive coating condition.Therefore it is significant to scientifically design ship's whole lifecycle corrosion prevention.According to the cathodic protection's requirement to coating.designed cathodic protection system coating scheme.This paper studies ship coating's corrosion protection mechanism and common paint.Designed the target ship's anticorrosive coating scheme.According to the target ship's feature design impressed current cathodic protection system.The system is made up of two partsrprotection and control system, monitoring system.Control system automatically adjusts power supply through feedback regulation mechanism and keep the protection potential within a reasonable range.Through monitoring system we can get the real-time protection potential of each monitoring point,thus getting the cathodic protection result clearly.Through scale model test verified the reliability of cathodic protection and found the influence of coating damage rate's change to cathodic protection.In the end,using numerical simulation method to design the ship's whole lifecycle cathodic protection scheme.Using coating damage rate's change to simulate coating's anticorrosive condition during different period.The preliminary design adopts impressed current cathodic protection method,but the protection potential's uneven distribution phenomenon is very serious.The optimized design adopts the combined method of sacrificial anode cathodic protection and impressed current cathodic protection.The optimized design's cathodic protection result is economic and effective.