新型氯化钾镀锌溶液除铁剂的研制

Development of a Novel Iron Remover for Potassium Chloride Zinc Plating Bath

氯化钾镀锌溶液中二价铁使电流密度范围变小,滚镀产品出现黑色滚桶眼子印。双氧水虽能将其氧化成危害性小得多的三价铁,但会使镀液分散能力下降,并会氧化消耗掉部分光亮剂;且双氧水被列入危险化学品名录,采购和贮存都较困难。为此,成功研制了一种不用双氧水的氯化钾镀锌溶液除铁剂DF(主要为二价铁的螯合剂),以解决这一长期困扰氯化钾镀锌工艺中存在的问题,并通过赫尔槽试验对其应用性能进行了表征。

The bivalent iron in potassium chloride zinc plating solution reduced the current density range,resulting in black barrel eye marks on barrel plating products.Hydrogen peroxide could oxidize them to much less harmful trivalent iron,but it also reduced the dispersion of plating solution and oxidized some brightener.Besides,hydrogen peroxide was listed in the list of dangerous chemicals,which was difficult for purchase and storage.In order to solve the problem in the process of potassium chloride zinc plating,a kind of iron remover DF(mainly divalent iron chelating agent)for potassium chloride zinc plating solution without hydrogen peroxide was developed.Besides,its application performance was characterized by Hull cell test.