It is often said that E-coating (also known as Electrophoretic Coating, EDP, Electropainting, KTL, Kathodische Tauch Lackierung, CDP or Cathode Dip Painting) is one of industry’s most efficient coating methods. The process allows parts to be uniformly coated in seconds with tough, chemically resistant materials. These coatings are deposited from a water-based solution using a high voltage DC charge. The process coats all wet surfaces with a highly corrosion resistance finish that is unlike any other process. The automotive industry has long been a user of this process for the undercoating of car bodies and it is largely responsible for all but eliminating rust in modern vehicles.
The nature of the process and the way e-coating plants are designed gives nearly 100% coating utilisation, making it an environmentally friendly finish.
Like many of our finishing processes, the components need to be racked on special electrically conductive racks before being processed through a number of cleaning and chemical pre-treatment stages. The components then enter the e-coat bath for the brief coating process. After this, the parts are rinsed and baked at around 190°C.
The process is very much tailored to bulk production runs where large quantities of parts can be racked in the most efficient manner possible on specially designed racks. As the colour is incorporated in the coating bath and different colours mean different baths, changing colours on this process is limited to large volumes of ongoing work only.
Using e-coat as an undercoat and applying powder as a top coat gives a unique combination of finishes that has the protection and recess covering of the e-coat with the colour and flexibility of powdercoating.
The large majority of e-coating done by Impreglon Australia is a corrosion resistant black interior coating. Clear UV resistant coatings can also be applied for certain exterior applications.
Due to the uniformity of the coatings, tapped holes, threaded exposed bolts and the like can often be coated without the need for masking as would be required in the case of powdercoating. Due to the baking temperatures, all materials processed must be able to withstand around 200°C.