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Phosphate pre-treatment is the most commonly overlooked step in preparation for coating. The generic term phosphating is a process where an acid attacks the metal of the work piece and re-deposits a material that is a combination of the metal substrate (and other metals-like zinc) along with phosphate.
Phosphate coatings are often used to provide corrosion resistance, however, phosphate coatings on their own do not provide this because the coating is porous. Therefore, oil or other sealers are used to achieve corrosion resistance.he application of phosphate coatings makes use of phosphoric acid and takes advantage of the low solubility of phosphates in medium or high pH solutions.