Profile: Nylo Metal Finishing, LLC specializes in providing phosphate and conversion coatings for steel & aluminum products. Our zinc phosphate coating produces extremely tight, dense and smooth crystal coating. Light zinc phosphate coating is a base for subsequent organic coating, which requires minimum material. Passivation is a chemical treatment for stainless steel. This treatment enhances the corrosion resistance of stainless steel. Passivation removes free iron and surface contaminates.