Alum Phosphating
Phosphate coatings are usually applied to carbon steel, low-alloy steel and cast iron. The coating is formed with a solution of iron, zinc or manganese phosphate salts in phosphoric acid, and is applied by either spraying the solution onto the substrate, or immersing the substrate into the solution. Phosphating creates a protective layer of passive oxide film of phosphate crystals that slows corrosion. It is use best for paint adhesion.
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