钢芯线镀Zn层对钢芯铝绞线腐蚀行为的影响

摘要

In order to investigate the influence of galvanized layer on the corrosion behavior of aluminum conductor steel reinforced ( ACSR ) , salt spraying experiment of 45 cycles ( 1080 h ) was adopted to make faster corrosion simulation. The surface morphology of ACSR was tested in each 15 cycles corrosion, and the corrosion products had been collected for XRD phase identification. The results showed that there were three steps in the ACSR anode reaction. Some bad effects had been produced by the steel’s galvanized layer on the aluminum strand, although its sacrificial anode reaction could protect the steel core strands. Some Al2 O3 had come out. Moreover, the polarization characteristics of aluminum strands in the NaCl solution with Al2 O3 granule were investigated. The results showed that the existence of Al2 O3 granule can reduce the corrosion potential of aluminum strands, which leaded to the decrease of ACSR’s corrosion resistance.%为了探讨钢芯线镀Zn层对钢芯铝绞线(ACSR)腐蚀行为的影响，对ACSR进行了45个周期(1080 h)的NaCl盐雾加速腐蚀试验。在其过程中实时检测ACSR表面形貌的变化，并收集腐蚀产物进行XRD物相鉴定。研究结果表明： ACSR腐蚀反应分为三个阶段，在各阶段中钢芯线镀Zn层的阳极反应虽然保护了钢芯线，但加剧了铝股线的腐蚀，产生了Al2 O3。本文进而研究了铝股线在有Al2 O3颗粒的NaCl溶液中，极化曲线的特征，结果表明： NaCl溶液中Al2 O3颗粒的存在使铝股线的自腐蚀电位往负方向偏移，耐蚀性降低。