Iron Phosphatizing Solution at Room Tempetature

The formulation of phosphatizing solution at room temperature was optimized by orthogonal test as follows:11 ml/L phosphoric acid(85%),15.5 g/L ammonium hydrogen phosphate,2.5 g/L nickel nitrate,2 g/L citric acid,2.5 g/L ammonium molybdate,1 g/L sodium fluoride and 1 ml/L emulsifier OP.The phosphating solution has such characteristics as being easily prepared,low cost,low sludge and high film-formation rate.The phosphating coating formed by this solution has good corrision resisistance.