Phosphate Coating & The Phosphating Process

Phosphate coatings are a crystalline conversion coating for steel and other metals that is formed on a ferrous metal substrate. The process of Phosphate coating is employed for the purpose of pretreatment 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 (P&O) to add anti-galling and rust inhibiting characteristics.

The phosphating process relies on the basic pickling reaction that occurs on the metal substrate when the process solution comes in contact with the metal. The main benefits that phosphating provides is strong adhesion and corrosion protection. Typically, phosphate coatings used on steel parts but can also be used on aluminum. Metal coatings offers both zinc phosphate and manganese phosphate coating. Our phosphate coatings additionally are offered in both dark gray & black.


Manganese Phosphate Coating

Metal Coatings offers black manganese phosphate coatings and dark gray manganese phosphate coatings (Type M) used for corrosion protection, anti-galling and lubricity. Of the numerous 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 after the breaking in of components that are subject to wearing. These coatings are applied only by immersion. Uses for manganese phosphate applications include the production of bearings, bushings, fasteners and other common industrial products. Use of manganese phosphate is especially useful in projects that require sliding of parts, such as automotive engines and transmission systems.

Zinc Phosphate Coating

Zinc phosphate coatings (Type Z) are also available and are mainly used for rust proofing on ferrous metals. 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. We offer both black zinc phosphate coatings and dark gray zinc phosphate coatings.

Phosphate Coating Statistics
Color dark gray / black
Coating Weight 2000-3000 mg / sq. ft
Top Coats Oil or Paint

Metal Coatings provides phosphate coating services throughout the United States. We also provide expedited delivery to southern states including Texas, Alabama, Louisiana, Oklahoma, and Mississippi. Our corrosion resistant phosphate coatings and manganese phosphate coatings for fasteners and other metal products are also available for emergency delivery. Contact Metal Coatings Corp. today to learn more about corrosion protection services and the phosphating process.

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