Based on how to lower the density of Fe2+ in the phosphate liquid, to discuss the formation cause of Fe2+, the method of lowering it and the economic benefit obtained.

• 以磷化处理中如何降低亚铁离子浓度为着手点,论述了亚铁离子的成因,降低亚铁离子的方法及产生的经济效益。