Phosphate conversion coating

Phosphate conversion coating is a chemical treatment applied to steel parts that creates a thin adhering layer of iron, zinc, or manganese phosphates to improve corrosion resistance or lubrication or as a foundation for subsequent coatings or painting.^[1]^[2]^[3] It is one of the most common types of conversion coating. The process is also called phosphate coating, phosphatization,^[4] phosphatizing, or phosphating. It is also known by the trade name Parkerizing, especially when applied to firearms and other military equipment.^[5]^: 393

A phosphate coating is usually obtained by applying to the steel part a dilute solution of phosphoric acid, possibly with soluble iron, zinc, and/or manganese salts. The solution may be applied by sponging, spraying, or immersion.^[6] Phosphate conversion coatings can also be used on aluminium, zinc, cadmium, silver and tin.^[7]^[8]

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^ Dunlap, Roy F. (2003). Gunsmithing : a manual of firearms design, construction, alteration, and remodeling : for amateur and professional gunsmiths, and users of modern firearms (2 ed.). Harrisburg, Pa.: Stackpole Co. ISBN 0-8117-0770-9. OCLC 59667928.
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[:0-5] Dunlap, Roy F. (2003). Gunsmithing : a manual of firearms design, construction, alteration, and remodeling : for amateur and professional gunsmiths, and users of modern firearms (2 ed.). Harrisburg, Pa.: Stackpole Co. ISBN 0-8117-0770-9. OCLC 59667928.

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