Fasteners with Phosphate Coating
Phosphate coatings are a crystalline conversion coating that is formed on the surface of a steel fastener.
Phosphate coating is employed for the purpose of pre-treatment prior to coating or painting, increasing corrosion protection and improving friction properties of sliding components.
In other instances, phosphate coatings are applied to threaded parts and top coated with oil to add anti-galling and rust inhibiting characteristics. The phosphate process relies on the
basic pickling reaction that occurs on the metal fastener when the process solution comes in contact with the metal.
The main benefits that phosphate provides are strong adhesion and corrosion protection.
Zinc phosphate coatings are also available and are mainly used for rust-proofing steel fasteners. They can be applied by immersion or spraying. Zinc phosphate is a lighter alternative to manganese phosphate while providing resistance to harsh elements that tend to wear products quickly.
Manganese phosphate coatings are for corrosion protection, anti-galling and lubrication.
Of the range of phosphate coating available, manganese phosphate coatings are the hardest, while providing unbeatable corrosion and abrasion protection. In comparison to zinc phosphate coatings, manganese phosphate coatings offer continued wear protection following the breaking in of components that are subject to wear. These coatings are applied only by immersion.