At that thickness, the film insulates the part, so attraction stops and electrocoating is complete. Depending on the polarity of the charge, electrocoating is classified as either anodic or cathodic. In anodic electrocoating, the part to be coated is the anode with a positive electrical charge, which attracts negatively charged paint particles in the paint bath. During the anodic process, small amounts of metal ions migrate into the paint film, which limits the performance properties of these systems. Their main use is for products in interior or mild exterior environments.
Anodic coatings are economical systems and offer excellent color and gloss control.
Cathodic In cathodic electrocoating, the product is given a negative charge, attracting the positively charged paint particles. The negative electrical charge of the metal part attracts positively charged paint particles. Reversing the polarities used in the anodic process greatly reduces the amount of iron entering the cured paint film and enhances the properties of cathodic products. Cathodic coatings are high-performance coatings with excellent corrosion resistance and can be formulated for exterior durability. Below are advantages and limitations of using the electrocoating process.