Electrocoating – (Also known as Elpo, Electrodip, KTL, or Electrophoresis )
The Electrocoating system was developed in the U.S.A. approximately 50 years ago. The first plant was for the processing of wheels and soon afterwards full Auto body plants went into production.
The developement of the Electrocoat technology provided improved corrosion protection especially in recessed areas.
The initial system used anodic electrodeposition, but was replaced by the superior stability of cathodic formulations in 1973. The film build can be adjusted within the specifications of the formulation used.
The process is similar to Electroplating, the main difference being that Electrocoating deposits organic resin molecules instead of metallic ions. The paint plating type operation allows for the object to be dipped into the electrodip water-thinned paint. The object to be painted is charged -ve i.e. the cathode, and the paint solids +ve i.e. anode and therefore deposits onto the cathode.
The electrical supply is a regulated and smoothed Direct current with the facility to adjust the voltage for film build considerations. Cathodic electrocoat paint consists of Resin, pigments, coalescing solvents and demineralized water.
The Electrocoat process is a one coat system and is therefore used mainly for the application of prime coats. There are, however, numerous small parts plants that require only single – one coat finishes with high corrosion protection all of which falls within the Electrocoat capability.
Major advantages include:
Electrocoat ancillary equipment:
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