WHAT ARE ZINC AND MANGANESE PHOSPHATES?
Zinc and manganese phosphate coatings are the treatment of iron or steel by immersion in a dilute solution of phosphoric acid and other additives. In the resulting chemical reactions, the surface of the metal is chemically converted to an integral protective layer of insoluble zinc and iron or manganese and iron phosphate crystals. Depending on the physical characteristics of the substrate and the pretreatment methods used, the translucent crystals appear black to light grey in color for zinc phosphate and black to dark grey in color for manganese phosphates. WHY ARE ZINC AND MANGANESE PHOSPHATES USED? For Lubrication During Cold Forming- A phosphate-based lubricant soap system is superior to all other lubricants for severe extrusions because of the ability of the coating to flow with the metal as it is deformed, reducing metal to metal contact. This characteristic is the result of strong metal-to-phosphate bonds, which are formed during coating and the excellent extreme-pressure prope
