借助数值模拟技术预测了某海管更换阳极前及采用不同牺牲阳极更换方案后的阴保电位分布及原有牺牲阳极的剩余寿命。结果表明：阳极更换前，海管的阴保电位达标（负于-800 mV），但牺牲阳极寿命不足10 a，这与水下机器人（ROV）的检测结果一致；采用方案2（9支块状牺牲阳极）更换阳极后的防护效果最佳，连续两次ROV检测结果表明海管得到有效保护。

With the help of numerical simulation technology, the distributions of the cathodic potential and the remaining life of the original sacrificial anode were predicted before replacing the anode of a submarine pipeline and after using different sacrificial anode replacement schemes. The results showed that before the anode was replaced, the cathodic protection potential of the submarine pipeline reached the standard (negative -800 mV), but the sacrificial anode life was less than 10 a, which was consistent with the detection results of the underwater robot (ROV). Scheme 2 (9 massive sacrificial anodes) had the best protection effect after the anode was replaced. The results of two consecutive ROV tests indicated that the subsea pipe had been effectively protected.