Metal parts are cleaned, degreased, and rinsed to remove rust, scale, and contaminants, ensuring the phosphate coating adheres uniformly to the base metal.
The parts are immersed in a phosphoric acid solution, which chemically reacts with the metal surface to form a crystalline phosphate layer that improves paint adhesion and corrosion resistance.
After coating, parts are rinsed and dried. Each piece is inspected for coating weight, crystal structure uniformity, and surface coverage before proceeding to painting or further finishing.
