This agent is a zinc phosphating agent, which is used for the antirust and decorative use of all kinds of steel and iron. It is often used for the ash phosphorus, black phosphorus, bicycle, motorcycle, automobile parts of the phosphating; motor shaft type of anti rust phosphating and so on. Fine crystalline phosphating film, in order, the film thickness up to 4-10 m; the film weight can reach at least 5-10.5g/ square meters; the pores of the membrane can be controlled in 0.2-0.6%. The workpiece by immersion phosphating, be able to pass 50 hours of salt spray test, if the matching and good anti rust oil, salt fog right up to 72-96 hours. In the same kind of product, the performance of this recharge can reach the leading level.