目的 利用冷镀锌层进行输电塔塔腿防护和损伤修复。方法 采用电化学腐蚀试验，并结合扫描电子显微镜等试验手段，研究输电塔塔腿镀锌层的耐腐蚀性能。结果 在NaCl和NaHSO3溶液中进行电化学腐蚀时，镀锌层的腐蚀速率随着溶液pH的增大而下降，腐蚀电流密度减小，耐腐蚀性能逐渐变好。在pH为4的酸性溶液中，锌层表面凹凸不平，腐蚀产物主要是ZnSO4。在中性和碱性溶液中，锌层溶解减弱，腐蚀后锌层表面较为平整，腐蚀产物呈针状或片状，腐蚀产物为ZnSO4和Zn5(OH)8C12?H2O。结论 在NaCl和NaHSO3酸性溶液中，镀锌层腐蚀电位较低，腐蚀速度较快，镀锌层发生晶界腐蚀而使表面凹凸不平。随着pH值的增大，镀锌层腐蚀速度快速降低，在pH值为10的碱性溶液中，镀锌层腐蚀速度显著降低，耐腐蚀性能增强。

The work aims to realize leg protection and damage repair of transmission tower using cold galvanized coating. Corrosion resistance of the cold galvanized coating on transmission tower legs was investigated by performing electrochemical experiments and using scanning electron microscopy (SEM). When completing electrochemical corrosion in NaCl and NaHSO3 solution, corrosion rate of galvanized coating decreased as solution pH increased, corrosion current density decreased, and corrosion resistance gradually improved. In acid solution with pH=4, surface of the zinc layer was rugged, and corrosion products were mainly ZnSO4. In neutral and alkaline solution, the zinc layer dissolved weakly, of the corroded zinc layer surface was relatively smooth, corrosion products were acicular or flake-like, corrosion products were ZnSO4 and Zn5(OH)8C12?H2O. In the NaCl and NaHSO3 acid solution, the corrosion potential is relatively low, the corrosion rate is relatively fast, and intergranular corrosion of galvanized layer makes the surface uneven. With the increase of pH value, the corrosion rate of galvanized layer decreases rapidly. In alkaline solution with pH=10, the corrosion rate of galvanized layer decreases significantly, and corrosion resistance improves.