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在自制的微动磨损试验装置上研究了LGJI50/25型钢芯铝绞线(aluminium conductor steel reinforced,ACSR)在工业大气腐蚀环境、不同振幅条件下的微动腐蚀行为。结果表明:铝股线微动腐蚀斑基本保持了干态微动磨损斑的特征,但磨损面分布有腐蚀产物层,在磨损斑的边缘有腐蚀孔洞;微动腐蚀铝股线的抗拉强度更低,而电阻率更高,导线的损伤程度更大,且随微动振幅增加而增大国;微动腐蚀铝股线的断裂开始于磨损斑下的疲劳裂纹,磨损面下的Ⅰ型与Ⅱ型裂纹借助于电化学反应,促进了铝股线的微动腐蚀,形成腐蚀孔洞,成为ACSR导线在大气腐蚀条件下微动损伤的主要原因。
The fretting corrosion behavior of LGJI50 / 25 ACSR under industrial atmospheric corrosion and different amplitude conditions was studied in a homemade fretting wear tester. The results show that the fretting corrosion spots of aluminum strands basically maintain the characteristics of dry fretting wear spots, but corrosion products are distributed on the wear surface and corrosion holes are formed on the edges of the wear spots. The tensile strength of fretting corrosion aluminum strands Lower, and higher resistivity, greater damage to the wire, and increased with the increase of fretting amplitude. Breaking of fretting aluminum strands begins with fatigue cracks under the wear spot. Type I and Type Ⅱ cracks promote the fretting corrosion of aluminum strands and form corrosion holes by means of electrochemical reaction, which is the main reason for the fretting damage of ACSR wires under atmospheric corrosion.