Electropaint is a dipping process in which electrically conductive substrates are immersed in a water-borne paint. Coating takes place when an electrical charge is applied to the components, the paint is deposited and this forms an even, continuous layer of paint over the entire surface of the component. The coating is generally black and has a dry film thickness of around 25µ. The coating thickness can be applied from 15µ up to 45µ. Electropainting can be classified as Cathodic or Anodic depending on the polarity of the charge applied in the process. The process is also known as Cathodic Electropaint, E Coat, EP, EPDM, ED, Electrocoat and Electrophoretic Coating.
Electropainting was designed primarily for the automotive industry due to its excellent coverage, corrosion resistance and substrate adhesion. With the correct and precisely controlled pre treatment and subsequent stoving to the right specification, the resultant paint film becomes a very good anti corrosion primer, giving in excess of 1000hrs salt spray (ASTM B117).
The process is used in all the major automotive and commercial vehicle manufacturers and is the first coat of paint all new car bodies receive. It is a major contributory factor in preventing modern day cars from rusting.
As a primer it is also a very good base for subsequent overcoating, especially with powder, which is used to improve the appearance, and durability and to give the parts resistance to exposure to Ultra Violet light (sunlight).