环保型多功能磷化液的磷化性能

工业常用的磷化液存在高能耗、工艺复杂、污染环境等缺点.以磷酸、氧化锌、成膜助剂铝盐和阴离子表面活性剂与非离子表面活性剂复配的表面活性剂为主要原料,以钼酸铵为磷化促进剂,研制了多功能钢铁磷化液,常温下具有除油、除锈、磷化、钝化等多重功能,在Q235钢上形成了均匀、连续,厚度约为5μm的磷化膜.考察了磷化膜耐NaCal溶液...

Phosphating Performance of Environmentally Friendly Multifunctional Phosphating Solution

Phosphating fluid with multifunctions including degreasing,rust-removing,phosphating and passivating was formulated using phosphoric acid,zinc oxide,aluminum salt film-forming additive and anionic and non-ionic mixed surfactants as the main raw materials in the presence of ammonium molybdate as an accelerator.The phosphating fluid was used to prepare uniform and continuous phosphating coating with a thickness of about 5 μm on the surface of Q235 steel.It was found that no rust was formed on the phosphating coating when it was immersed in 3% NaCl solution at(20 ± 2) ℃ for 1 h.After the corroded sample was dried,no sign of rust was observed within 13 h.Besides,the phosphating coating was able to endure dripping of CuSO4 solution for more than 3 min,and the dried sample after dripping corrosion test was free of rust after being stored for up to 60 d in non-corrosive atmosphere with a relative humidity below 70%.