Automotive Ecoat Video of the Electrodeposition ProcessThe Electrophoretic Coating (e-coat) process is widely used in the automotive and other industries for corrosion protection as it offers the ability to deposit a uniform coating over an entire component including those with bends, cavities or areas which would be hard to coat with a conventional powder coat or liquid spray painting process.
Electrophoretic coating is a painting process which is widely used in industry to coat a wide range of metal components. Its main use and development has been within the automotive sector but it also has many other decorative applications. The automotive epoxy type electro painting process is most often available commercially in black or grey but other colours are possible with decorative acrylic and polyurethane resin chemistries
The process typically involves a number of stages including a cleaning stage followed by a phosphate conversion coating which enhances the corrosion resistance of the metal and also provides an improved base for the subsequent coating. After the metal is properly prepared the electropainting process can take place. This is then followed by an oven curing stage.
Many Automotive E-coating plant use automatic finishing facility with zinc phosphate pre-treatment and using cathodic epoxy grey or black paint. This process is also known as Electrocoating, Electropainting, E Coating, Electrophoretic Deposition (EPD), KTL, E coat, EP coating, Cathodic Dip Painting (CDP) and Electrodeposition.
The e-coat process can be used to produce a basic coating in its own right by giving excellent corrosion protection to components not requiring a more decorative finish. It can also be used in combination with a powder coated finish on components that need a higher degree of protection and a more robust and aesthetic finish.
Typical Automotive E coat Process Sequence
1. Load parts
2. Alkali Cleaner
3. Water rinse
5. Zinc phosphate
6. Water rinse x 2
7. De-mineralised water rinse
8. E-coat (Cathodic Epoxy KTL electrophoretic coating)
9. 2 or 3 stage ultra-filtration dip or spray rinse
12. Inspection packing
Gloss level: 50%
Process: Cathodic Epoxy
Pre-treatment: Tri Cationic automotive quality Zinc Phosphate
Corrosion protection: 1000 hours neutral salt spray
Suitable substrates: Steel, Galvanised Steel, Aluminium, Ferrous and Non Ferrous Castings
This is a video of the process at Euro Quality Coatings Limited Cardiff Wales and is a good example of a high quality automated Electrophoretic Deposition application line