某输电线路工程所用钢芯铝绞线在未架空时便发生严重腐蚀。通过宏观观察、化学成分分析、扫描电镜分析、能谱分析以及红外光谱分析的方法，对该钢芯铝绞线进行了理化检验以分析其腐蚀原因，探究腐蚀机理。结果表明：空气中的含硫化合物是腐蚀产物中SO2-4的主要来源，基体中弥散分布的FeAl3第二相粒子加速了铝绞线的腐蚀。建议控制铝绞线化学成分中铁元素的含量，提高其耐蚀性，在运输或贮存过程中避免接触雨水和潮湿空气。

Serious corrosion appeared in steel-reinforced aluminum twisted wires used in one power transmission line project before setting up. Physical and chemical tests, such as macroscopic observation, chemical composition analysis, scanning electron microscope analysis, energy spectrum analysis and infrared spectral analysis, were carried out to analyze the corrosion cause and corrosion mechanism. The results show that the sulfur compounds in the air were the main source of SO2-4 in the corrosion product. Second-phase particles FeAl3 dispersed in the matrix accelerated the corrosion process of the wire. It was recommended that the content of iron element of aluminum twisted wires should be controlled to promote the corrosion resistance, and the aluminum twisted wires should be protected from the rain and wet air in the process of transportation or storage.