热浸镀锌的基本原理(3)

热浸镀锌的基本原理

4.1 水洗的重要性.................................................................26 4.2 盐酸酸洗后的清洗.............................................................26 4.3 硫酸酸洗后的清洗.............................................................26

5 溶剂处理（助镀）.............................................................27 5.1 浸助镀剂的作用和反应机理.....................................................27 5.2 助镀剂的常用浓度与成分比例...................................................28 5.3 浸助镀剂的工艺参数...........................................................31 5.4 助镀剂的净化再生.............................................................32

6 烘干处理.....................................................................33 7 浸镀.........................................................................33 7.1 浸入速度.....................................................................33 7.2 产品的出锅提出...............................................................33 7.3 浸镀温度.....................................................................34 7.4 浸镀时间.....................................................................35 7.5 锌锅维护.....................................................................35

8 去除表面余锌.................................................................36 8.1 离心法.......................................................................36 8.2 爆钝法.......................................................................36

9 冷却.........................................................................36 9.1 空冷.........................................................................36 9.2 水冷却.......................................................................36

10 钝化处理....................................................................37 10.1 钝化处理的作用..............................................................37 10.2 常用钝化工艺................................................................37

11 紧固件热浸镀锌常添加的合金元素..............................................38

11.1 铝的添加...................................................................39 11.2 镍的添加...................................................................39 11.3 常用添加合金化学成分.......................................................40

三 热浸镀锌层质量要求和试验方法

1 镀层的外观要求及试验方法.....................................................41 2 镀层厚度要求及试验方法.......................................................41 3 镀层附着力要求及试验方法.....................................................43 4 镀层均匀性要求及试验方法.....................................................43 5 镀层的耐腐蚀试验（中性盐雾试验）..........................................43