一次氯化钾滚镀锌故障处理

Handling of Malfunctions of Potassium Chloride Barrel Zinc Plating

对一次氯化钾滚镀锌故障进行了分析,并提出了处理方法。在目前的滚镀生产线上,基本上是用稳流器将镀槽的施镀电流控制在某一固定值附近,通过调整滚桶装载量的方式进行生产。由于氯化钾镀锌液中含有较多吸附性较强的大分子有机物添加剂,在电镀过程中这些添加剂在镀件表面脱附较慢。当电流密度较大时,镀层中就容易夹杂较多的有机物。在滚镀比表面积较小的零部件时,如果采用与电镀比表面积较大的零部件同样的施镀电流,则会产生不良镀层。因此,在氯化钾滚镀锌的生产中,除了调整滚桶装载量外,还需根据镀件比表面积调整施镀电流。通过改进传统的操作方法,排除了这次氯化钾滚镀锌的故障。

The malfunctions of potassium chloride barrel zinc plating were analyzed, and the handling methods were put forward. The electroplating was carried out mainly by controlling the plating current to an approximately fixed value with a current stabilizer and adjusting the barrel loads in current barrel plating production lines. Organic macromolecule additives have stronger absorbability contained in the potassium chloride zinc plating bath in a higher concentration, which lead to the additives slowly desorbed on the surface of electroplated parts during electroplating, so additives were easily mingled in the coatings when the electroplating was carried out with higher current density. If the electroplated parts that have smaller specific surface area were electroplated with barrel by using plating current as same as the electroplated parts that have greater specific surface area, the undesirable coatings will be produced. Therefore, beside adjustment of barrel loads, the plating current needs to be adjusted according to the specific surface area size of the electroplated parts. The described malfunction had been eliminated by improving the conventional operation method of potassium chloride barrel zinc plating.