EDP coating


EDP coating is an application used to wrought and cast steel/irons, zinc or aluminium die cast products, bronze-welded and zinc-coated steels. The advantages of using this technique is that, unlike other coated processes, it is able to coating deep recesses in complex shapes while maintaining a uniform thickness. It also provides corrosion resistance, and is environmentally-friendly.


A metal part is first immersed in a water-based solution that contains emulsion. Then, we use an electric voltage to do the trick - the paint emulsion is thus condense onto the part. The surface, both inside and outside of the part, will be covered with a layer of paint. The coating thickness is limited by the applied voltage.

As areas of high voltage build a coating they become insulators thus allowing lower voltage areas to build up. Finally, the interior of a part can be coated since the exterior is fully insulated by the coating.

Following the painting tank, a rinse tank removes the residual emulsion from the part and recycles it back to the paint tank by ultrafiltration. The E-coat is cured by heat and the curing time and temperature is determined by the E-coat chemistry; epoxy, acrylic, etc.

Cleaning, rinsing, acid etching, rinsing, wetting agent dip, E-coat, E-coat rinsing and recovery, DI rinsing and curing with convection are some of the typical steps applied in EDP coating.

Unison Tek has trusted coating partners who can assist with this type of treatment. Combined with our strong machining capabilities, we are able to provide a one-stop machining service – from machining to post-treatment.

Feel free to contact us if you are interested in getting to know our service at sales@unisontek.com.tw. We look forward to hearing from you.

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