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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.
The zinc phosphate coating is non-conductive so it protects the specimen's surface from electrochemical oxidation that leads to rust and corrosion. 505 Effect of Zinc Phosphating on Corrosion Control for Carbon Steel Sheets Eng. & Technology, Vol.26, No. 5, 2008 5.The matrix of the phosphate coating form capillaries that increase the surface area and provide a mechanical interlocking structures on which the paint can adhere which explore as Figures (2,6)).04 Effect of Zinc Phosphating on Corrosion Control for Carbon Steel Sheets Eng. & Technology, Vol.26, No. 5, 2008 In this work four different solutions were prepared for cleaning and etching the specimens.