Titanium Salt Conversion Coating on Steel

In order to reduce environmental pollution, non-toxic salts of titanium salt was used to replace toxic chromate chemical to form chemical film on steel. By using orthogonal test the optimum process was obtained as follows: room temperature, HCl system, ethanol titanium 13.3 g/L, OP-10 40.0 g/L, oleic acid soap 6.67 g/L, potassium chlorate 6.67 g/L, sodium benzoate 0.83 g/L, time 40 min. The results show that the process is simple and no environmental pollution, and the film is uniform and gray. There is no rust on steel after immersion in salt water for 3 h or indoor hanging for 20 days, indicating that the corrosion resistance of the film is relativly good.