为解决某油田4 000 m深井TP110-3Cr套管外腐蚀问题，研制了一种新型耐高温锌合金牺牲阳极。采用电化学技术对阳极材料进行了极化曲线和电流效率测试。结果表明：在80℃时，阳极极化曲线较平缓，开路电位较负，无高温"逆转"现象，电流效率大于80%，腐蚀均匀，腐蚀产物易脱落。在模拟某油田地层水条件下，评估了新型阳极的高温防腐蚀性能。结果表明：新型锌合金牺牲阳极在125℃以下，可有效保护套管；在130℃时，阳极发生断裂失效，无法继续使用。

To control the external corrosion of TP110-3Cr casing of a 4 000 m depth well in an oilfield, a new-type zinc alloy sacrificial anode at elevated temperature was developed. Measurements of polarization curves and current efficiency of the anode show that at 80℃, polarization curve was relatively flat, open circuit potential quite negative and no potential reversal phenomenon was observed, the current efficiency reached 80%, its corrosion morphology was uniform and corrosion products easily falled off. In simulated water of the oilfield site, the corrosion protection performance of the new-type sacrificial anode was evaluated at elevated temperature. It can be concluded that the new anode can protect the casing material efficiently below 125℃, while at 130℃cracking phenomenon might appear and the anode can not be used.