Improved Conversion Coating for Protection of Metals

A simple, cost effective, environmentally friendly conversion-coating process has been developed for protecting a variety of metals against wear and corrosion and to increase adhesion of paints. This process results in the deposition of a thin, adherent coats of iron phosphate on treated metal substrates. This process is expected to supplant the environmentally hazardous chromate-based conversion- coating process heretofore used in the automotive and aerospace industries. It is also expected to supplant a process in which bearing races made of 440C stainless steel are pretreated with tricresyl phosphate.