(1. 合肥工业大学 材料科学与工程学院，合肥 230009；
2. 安徽省电力科学研究院 材料所，合肥 230601)
摘 要: 在模拟大气腐蚀环境中，采用干/湿NaHSO3+NaCl水溶液盐雾试验研究钢芯铝绞(ACSR)导线腐蚀产物的相组成及腐蚀层结构，讨论其腐蚀机理。结果表明：ACSR导线中单股铝线或镀锌钢芯线的腐蚀主要表现为点蚀，腐蚀产物组成复杂，主要为锌和铝的氢氧化物、硫酸盐与氯化物的复式盐；在腐蚀初期，内外层铝股线及钢芯线表面镀锌层开始形成点蚀坑，逐步形成连续的腐蚀层；由于镀锌层和内层铝股线之间构成原电池，因为牺牲阳极效应，镀锌层腐蚀速率最大；而内层铝股线受到保护，腐蚀速率最小，外层铝股线腐蚀速率居中。
关键字: 钢芯铝绞导线；大气腐蚀；显微结构；腐蚀机理
atmospheric corrosion and corrosion mechanism
（1. School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China;
2. Materials Department, Anhui Institute of Electric Power Science, Hefei 230601, China）
Abstract:The dry/wet NaCl+NaHSO3 atmosphere-salt spraying experiment of the aluminum conductor steel reinforced (ACSR) conductor was carried out to study the phases and microstructures of corrosion products and the corrosion mechanism in simulated air corrosion condition. The results show that the ACSR conductor is mainly corroded by pitting corrosion. The corrosion layer mainly consists of hydroxides, sulfates and sulfate-chloride double salts and their hydrates of Zn and Al. At the initial corroding stage, the corrosion pits form on the Al strands and the galvanizing Zn layer, which are gradually replaced by the continuous corrosion layers as prolonging the spraying time. In the ACSR conductor, a primary cell is generated between the galvanizing Zn layer and the internal Al layer in the electrolyte. In the cell, as an anode, the galvanizing Zn layer is violently etched, contrarily, as a cathode, the internal Al layer is protected. In the ACSR conductor, the sequence of the corrosion rate from high to low is the galvanizing Zn layer, the external Al layer and the internal Al layer.
Key words: ACSR conductor; atmospheric corrosion; microstructure; corrosion mechanism
