Zinc phosphating serves as a base for organic coatings such as paint, powdercoat or lacquer, lubricating oils or waxes. The coating provides minimal corrosion protection—its purpose is to provide a crystal structure to which the subsequent organic coating, oil or wax can mechanically bond. Zinc phosphating can be grey or black, with these colours deepened by subsequent application of oil. For defense applications, this finish can reduce reflectivity of base materials. Zinc phosphating is sometimes referred to as Parkerizing.
Manganese phosphating has excellent corrosion resistance, and provides superior lubrication for metal to metal contact. Manganese phosphating results in coatings that have a crystal structure that has finish has excellent break-in properties and reduces wear on moving surfaces. It prevents scoring and galling on moving parts. The absorptive manganese phosphate coating retains oils, rust preventives and lubricants.
ACS produce phosphate coatings in accordance with the requirements of:
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