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在磷化处理过程中,磷化溶液中的亚铁离子应控制在0.8～2克/升范围内。当溶液中Fe离子含量不断升高,达到2.5克/升时,磷化膜结晶粗大,其膜层厚度和强度均有增加,膜层质量和性能降低。然而对亚铁离子的降低却是十分困难的,一般采用抽出磷化溶液,用稀释法来降低亚铁离子的含量。我们发现一个很方便的方法,在磷化溶液中亚铁离子过高时,采用高锰酸钾处理来降低亚铁离子含量,其效果很好,经
In the phosphating process, the ferrous ions in the phosphating solution should be controlled in the range of 0.8-2 g / l. When the content of Fe ions in the solution increased continuously and reached 2.5 g / L, the phosphating film became coarse and its film thickness and strength increased, and the quality and performance of the film decreased. However, the reduction of ferrous ions is very difficult, generally used to extract the phosphate solution, with dilution method to reduce the content of ferrous ions. We found a very convenient way to reduce the ferrous ion content by potassium permanganate treatment when the ferrous ion is too high in the phosphating solution and the effect is very good.