新型平衡舵阴极保护设计与保护效果评价  

Cathodic Protection Design and Protection Effect Evaluation of New Balanced Rudder

作　　者：吴正江[1] 李开伟 毛旭耀[1] 张润林 伍健 侯健 宋卿源 张迪 WU Zhengjiang;LI Kaiwei;MAO Xuyao;ZHANG Runlin;WU Jian;HOU Jian;SONG Qingyuan;ZHANG Di(Wuhan Second Ship Design and Research Institute,Wuhan 430064,China;National Key Laboratory of Marine Corrosion and Protection,Luoyang Ship Material Research Institute,Shandong Qingdao 266237,China)

机构地区：[1]武汉第二船舶设计研究所,武汉430064 [2]洛阳船舶材料研究所海洋腐蚀与防护全国重点实验室,山东青岛266237

出　　处：《装备环境工程》2024年第6期111-118,共8页Equipment Environmental Engineering

摘　　要：目的 针对新型平衡舵结构的电偶腐蚀薄弱区域,设计并优化牺牲阳极保护系统,并对保护效果进行评价。方法 基于边界元法,开展新型平衡舵电偶腐蚀仿真研究,分析电偶腐蚀薄弱区域。针对腐蚀薄弱区域,采用经验法设计牺牲阳极保护系统,开展服役初期和服役3 a后阴极保护效果仿真。从涂层破损率和阳极数量对阴极保护效果的影响出发,优化阴极保护系统。开展物理模型试验,对优化后阴极保护系统的保护效果进行评价。结果 电偶腐蚀主要发生在壳体和底座等支撑材料处,必须采取严格的防腐措施。采用经验法设计的牺牲阳极保护系统在服役初期可以使平衡舵保护电位均负于–800m V,处于良好的阴极保护状态。随着阳极的消耗,服役3 a后,阴极保护系统无法为平衡舵提供有效保护。涂层破损率的增加和阳极数量的减少,都会使平衡舵阴极保护电位正移。通过物理模型试验验证了优化后阴极保护模型的可靠性,对比试验结果,模型的预测误差在5%以内。结论 优化后的阴极保护方案为涂层+8块牺牲阳极,可以在服役3 a涂层破损率达20%的严苛工况下,为平衡舵提供有效阴极保护。优化后的阴极保护系统,铝阳极用量减少30%,有助于节省船舶动力。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.

关 键 词：新型平衡舵 电偶腐蚀 数值模拟 牺牲阳极阴极保护 边界元法 实海测试 

分 类 号：TG172[金属学及工艺—金属表面处理]