Coating Terms

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General name for surface treatment operations applied to enhance corrosion resistance of metal surface and to improve adhesion of organic coatings. Iron phosphate coatings are obtained by converting the iron atoms already present on the metal surface to iron phosphate molecules by using phosphoric acid rich compounds. On the other hand, zinc phosphate or phosphate-nickel-manganese (trication) phosphate coatings are obtained by formation of a thick crystalline layer that enables higher corrosion resistance than iron phosphate coatings.