合成绝缘子金具镀锌层缺陷分析与控制

Defect analysis and control of hot-dip galvanized zinc coating on composite insulator hardware fittings

分析了绝缘子金属附件在热镀锌时出现漏镀、灰暗、皱纹、厚度不均匀、锌瘤,及热镀锌后的机加工、修整工序中出现脱锌皮、变色、"白锈"等缺陷的主要原因,包括表面预处理状况不佳,基体状态不良,锌液中夹杂了有害成分,镀锌工艺不合理及机加工方法上的缺陷。给出了控制缺陷的措施,如酸洗后进行清水漂洗,抛光前要根据情况进行脱脂处理,热镀锌前增加活化助镀,降低锌液中铁离子含量,采用正确的方法向锌液中添加合金,根据镀件的大小制定合理的浸锌时间,严格控制锌液温度等。

Main causes for the skip plating, dark and gray deposit, wrinkling, non-uniform thickness and zinc nodules in hot-dip galvanizing on metal accessories of insulator as well as the exfoliation of coating, tarnishing and "white rust" formation in subsequent machining and finishing processes were analyzed, including poor surface pretreatment, unfavorable substrate conditions, existence of harmful components in molten zinc, unreasonable galvanizing process and defective machining method. Some control measures we...