阀控式铅酸蓄电池负极汇流排的腐蚀成因及防护对策

发布时间：2018-07-26 20:24

【摘要】：阀控式铅酸蓄电池负极汇流排的腐蚀及脱落是造成电池早期失效的一个重要原因。对早期失效电池负极汇流排的腐蚀形态进行了宏微观分析,对其不同部位(极柱、极群和焊接区)进行了电化学测试。结果表明:在电池浮充条件下负极汇流排处于贫液富氧环境和缺乏足够的阴极保护,形成了汇流排腐蚀的环境;汇流排焊接区的冷却速度与极柱和极群存在显著差异,使焊接区材料的晶粒变为粗大的柱状晶,从而导致其电化学反应活性高于极柱和极群区域,造成其焊接区严重的晶间腐蚀。对此,从3个方面提出了相应的防护对策。
[Abstract]:The corrosion and shedding of the negative busbar is an important reason for the early failure of the battery. The corrosion morphology of negative electrode busbar in incipient failure battery was analyzed by macroscopical and microscopical analysis, and electrochemical tests were carried out on different parts (pole column, pole group and welding area). The results show that the negative electrode busbar is in the condition of poor liquid and oxygen enrichment and lack of adequate cathodic protection, which results in the corrosion of the busbar, and the cooling rate of the welding zone of the bus is significantly different from that of the pole column and pole group. The grain size of the welding zone is changed into coarse columnar crystal, which leads to the electrochemical reaction activity of the material is higher than that of the polar column and the polar group region, resulting in serious intergranular corrosion in the welding zone. Accordingly, the corresponding countermeasures are put forward from three aspects.
【作者单位】：武汉大学资源与环境科学学院;海军工程大学理学院;河南省电力科学研究院;
【基金】：国家自然科学基金资助项目(51325102)
【分类号】：TM912.1

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