舰船铜合金海水管路铁基牺牲阳极阴极保护研究

Research on Cathodic Protection by Sacrificial Anodes of Copper Alloy Pipes in Seawater Environment for Shipboard

采用电化学测试、电偶腐蚀试验和腐蚀仿真计算方法综合研究了铁基牺牲阳极在海水环境下对铜合金管路提供阴极保护的效果。研究结果表明,海水环境下铁合金牺牲阳极与铜合金开路电位差值合理,在提供充分的阴极保护驱动电位的前提下,能够有效降低阳极材料的溶解速率,比锌合金阳极更适合于铜合金的阴极保护;铁基牺牲阳极在铜合金管路阴极保护过程中,保护电流发散受管路尺寸影响,一般可保护10倍管径范围区域。研究成果对于提高海水环境下铜合金管路的腐蚀安全性具有参考意义,具有良好的工程应用价值。

The cathodic protection by sacrificial anodes of couper alloy pipes in seawater environment were investigated by electrochemical test,galvanic corrosion test and corrosion simulation. The results showed that a proper potential gap existed between iron-based sacrificial anodes and copper alloy,indicating that iron-based anodes could have a better cathodic protection behavior and lower consumption rate than zinc-based anodes could. The cathodic protection properties of iron-based alloy were affected by the sizes of the pipes needing protection,and the effective area were about 10 times of the diameter. Results of the reseach presents significance in protecting the copper alloy pipes from corrosion and substantial engineering value in cathodic protection design for copper alloy pipes in seawater environment.