Electro-deposition of primer coating has become universal for a modern automotive paint shop. In ED, charged particles from the paint emulsion move to Anode (AED) or Cathode (CED) under electrical forces. The direct current established through the bath makes the pigment and resin base
of the paint wander towards the body surfaces.
Coating reaches all the recessed area. Deposited film does not re-dissolve. However, the un-deposited material is rinsed. Ultra filtrate (UF) equipments are used for ED paint ingredients separation of those not forming film and recovery of Paints. Deposited film after stoving becomes hard, durable polymeric film.
The CED process can be done in Batch Type (Dip Tanks) or continuous conveyorised type.
The major steps in CED process are: