The Anochrome Group offers Cathodic E-cote using the BASF paint process as it offers properties better suited to the requirement of major automotive original equipment manufacturers. The performance for this process is very good when compared to similar priced processes, achieving in excess of 1000hrs salt spray (ASTM B 117).
The fundamental principle that makes electrophoretic coating work is that opposite charges attract each other. In the electrophoretic coating process a direct current rectifier is used to create a voltage potential between a conductive part and an oppositely charged electrode that is immersed in the electro coat paint tank. The electro coat paint particles are also capable of being electrically charged and are deposited out of a water suspension to coat the conductive part when the rectifier is turned on.
The deposition is self-limiting and slows down as the applied coating electrically insulates the part. Electro coat solids deposit initially in the part areas that are closest to the counter electrode and as these areas become insulated to the current, solids are forced into more recessed bare metal areas to provide complete coverage. This phenomenon is known as throwing power and is a critical aspect of the electrophoretic coating process. The net result of this effect is a fairly even and repeatable depoit thickness in recesses and on corners and edges.
The rack plating process involves locating the items to be coated on an electrically conductive jig / rack. The rack is then submerged into a series of tanks containing the appropriate chemical solutions, to commence the plating process. This is a more costly option than barrel platings but may be more suitable for large or complex parts.