ZNP-54 PHOSPHATING 1 Phosphating: - Application of Zinc Phosphate Solution: The metal is immersed in or sprayed with a zinc phosphate solution (ZNP-54 solution). The solution contains zinc, phosphoric acid, and other chemical accelerators. - Reaction: A chemical reaction occurs between the metal surface and the phosphating solution, forming a layer of zinc phosphate crystals on the surface. This layer is typically gray to black in color and has a fine crystalline structure. 2. Rinsing: - Water Rinse: After phosphating, the metal is rinsed with water to remove any unreacted phosphate solution. - Final Rinse: Sometimes, a final rinse with deionized water or a passivating rinse is applied to enhance the corrosion resistance and adhesion properties of the phosphate layer. 3. Drying: - The treated metal is dried thoroughly, often using hot air blowers or ovens, to ensure that no moisture remains on the surface. Post-Treatment: Sealing: A sealing agent might be applied to the phosphated surface to further improve corrosion resistance. Painting or Coating: The phosphated metal can now undergo painting, powder coating, or other finishing processes, with the phosphate layer serving as an excellent adhesion promoter.