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喷淋式的前处理是用压力式的喷淋管道来清除工件表面的油脂及完成磷化处理的。对封闭的箱式自动生产线来说,清除管道内的脏物及积聚的磷化液残渣是比较困难的,尤其是磷化喷淋头的清除疏通。为此,我们找出了一种较好的清除方法。一、管壁上积聚的残渣成份磷化液中残渣的形成是在钢铁件表面形成磷酸盐覆膜时产生的。磷化液中的废液主要成份为FePO_4、Fe(OH)_3、Fe(OH)_2、Zn_2Fe(PO_4)_2,加入磷酸可使其沉淀溶解约为90％,其反应生成Zn~(2+)、Fe~(2+)、Fe_(3+)、HPO_4~(2-)。
Spray pre-treatment is the use of pressure-type spray pipe to remove grease on the surface of the workpiece and complete the phosphating. For the closed box automatic production line, it is more difficult to clear the dirt in the pipeline and residue of phosphating solution, especially the clear and clear of the phosphate spray head. To this end, we found a better method of removal. First, the accumulation of residue on the wall composition Phosphating residue formation is formed in the steel surface phosphate coating generated. The main components of the waste liquid in the phosphating solution are FePO_4, Fe (OH) 3, Fe (OH) 2, Zn_2Fe (PO_4) _2 and the addition of phosphoric acid can make the precipitate dissolve about 90% ), Fe ~ (2 +), Fe_ (3 +), HPO_4 ~ (2-).