How does E-Coating work?
Electro coating applications use paint particles suspended in a fluid bath. An opposite charged part is lowered into the paint bath and the paint particles are drawn to the metal part. The paint particles build up on all surfaces of the metal part to form an even, continuous, low-profile film over the entire surface. This process continues until the desired film thickness is reached. Film thickness is regulated by the amount of voltage differential applied. The higher the voltage, the thicker the film build.
Working on the principle that opposites attract, an e-coat system applies an electrical charge to either the metal part, or the fluid in the immersion tank. The paint is than attracted by one or the other being grounded. The process can be performed either way, however there are benefits of having the part grounded (-) and a charge applied to the solution (+) vs. having the parts (+) positively charged and the tank solution holding a (-) negative charge. Depending on the polarity of the charge, either an anodic or a cathodic method can be used for e-coating.