某滨海核电厂在使用海水3 a后，鼓型滤网的大部分牺牲阳极仍溶解不足，甚至发生脱落。通过对鼓型滤网的防腐蚀设计、牺牲阳极的化学成分和电化学性能进行分析，研究了该牺牲阳极溶解不足的原因。结果表明：牺牲阳极内部存在铸造缺陷，海水从缺陷处进入牺牲阳极内部，母材优先发生腐蚀并完全溶解后，牺牲阳极发生脱落；牺牲阳极的电化学性能不符合标准规定，其铟含量较低是导致溶解不足的根本原因。

Three years after a coastal nuclear power plant using seawater, most of the sacrificial anodes of the drum filter screen were still insufficiently dissolved and even fell off. Through the analysis of the anti-corrosion design of drum filter screen, the chemical composition and electrochemical performance of sacrificial anode, the reasons for the insufficient dissolution of sacrificial anode were studied. The results showed that there were casting defects inside sacrificial anode, seawater entered the inside of sacrificial anode from defects, and the base material was corroded preferentially and completely dissolved, the sacrificial anode fell off. The electrochemical performance of sacrificial anode did not meet standard regulation, and its low indium content was the root cause of insufficient dissolution.