7 Tank Process for Powder Coating The 7-tank process for powder coating is a surface preparation method that involves a series of chemical baths to clean and condition metal surfaces before applying a powder coating. This process enhances the adhesion of the powder coating and improves corrosion resistance. Here's a breakdown of the 7-tank process: Degreasing: This stage removes oils, grease, and other contaminants from the metal surface using an alkaline cleaner. Water Rinse: A thorough rinse to remove the alkaline cleaner and loose debris. Derusting/Descaling: Removes rust, scale, and other oxides from the metal surface, often using an acid solution. Water Rinse: Another rinse to remove the acid solution and any remaining contaminants. Phosphating: This step applies a phosphate layer to the metal surface, which improves corrosion resistance and enhances coating adhesion. Water Rinse: A final rinse to remove any residual chemicals from the phosphating process. Passivation/Drying: The final step involves passivation to further enhance corrosion protection and drying to prepare the surface for powder coating. #7 Tank Process for Powder Coating Chemicals Manufacturer.