钢芯铝绞线的铝线在NaCl溶液中的腐蚀行为  

Corrosion Behavior of Steel-Cored Aluminum Strand Wire in Aqueous Sodium Chloride

作　　者：宗庆彬[1] 黎学明[1] 杨萍[1] 李勇 吴高林 邓帮飞 

机构地区：[1]重庆大学化学化工学院,重庆400044 [2]重庆电力科学试验研究院,重庆401123

出　　处：《材料保护》2012年第3期33-36,40,共5页Materials Protection

基　　金：重庆市电力公司重点科技项目(2010渝电科技30);重庆市交通委员会科技计划项目;重庆市自然科学基金(2004BB6065)

摘　　要：钢芯铝绞线正常运行温度达80℃,受到环境中盐离子的严重腐蚀。采用Tafel直线外推法、电化学阻抗谱法及加速腐蚀试验法,研究了钢芯铝绞线的铝线在不同浓度NaCl溶液中的腐蚀行为,利用SEM和XRD等表征了其腐蚀表面状态及产物形貌。结果表明:随着NaCl浓度的升高,铝线的自腐蚀电位负移,极化电阻变小,腐蚀速率增大,当NaCl为70 mg/L时腐蚀速率急剧增加,是10 mg/L NaCl时的40倍;腐蚀产物及钢芯表面镀锌层可抑制铝线的腐蚀,铝线腐蚀后的表面出现大量的"麻点"及腐蚀坑,白色的腐蚀产物主要由Zn0.64Al0.36(OH)2(CO3)0.18.0.86H2O组成。The corrosion behavior of steel-cored aluminum strand wire in NaCl solutions with different concentrations was studied using Tafel linear extrapolation method,electrochemical impedance spectroscopy and accelerated corrosion test.The morphology of the corroded Al wire was examined by scanning electron microscopy,and the phase composition of the corrosion products was analyzed by X-ray diffraction.It was found that with increasing concentration of NaCl solution,the corrosion potential of the outer Al wire shifted towards negative direction,accompanied by decreased polarization resistance and increased corrosion rate.Particularly,the corrosion rate sharply rose when the concentration of NaCl solution reached 70 mg/L.Moreover,a great amount of corroded 'hemp dots' and pits was formed on the corroded surface of the Al wire,where white corrosion product mainly consisting of Zn 0.64 Al 0.36(OH) 2(CO 3) 0.18 · 0.86H 2 O was generated.Fortunately,both the corrosion products and galvanizing coating on the surface of the Al wire could inhibit its corrosion.

关 键 词：腐蚀行为 NACL溶液 钢芯铝绞线 铝线 

分 类 号：TG174.3[金属学及工艺—金属表面处理]