PHOSPHATING SOLUTION AND TECHNOLOGY FOR DRAWING AT MIDDLING AND HIGH TEMPERATURES

A phosphating solution was developed for middling and high temperature drawing,which used Zn-Ca-Ni-Mn as main materials of phosphating film,nitrate as accelerant and organic acid as stabilization agent.It had no nitrite and regulative agent,less sedimentary residue and more stable capability.The effects of Ca2+ concentration on total acidity,dissociative acidity,time and tempareture of phosphating processing on phosphating film were studied.Optimal phosphating parameters were obtained.