Cataphoresis coatings (KTL)

Efficient, environmentally friendly and high-quality coatings

Are you looking for an efficient, environmentally friendly method and, above all, a first-class protective coating for metal surfaces? Cataphoresis lacquers (Kathodische Tauch Lackierung), also known as KTL or e-coating – is the answer. The process applies a high-quality primer to a metal surface, and this water-based paint system offers many advantages.
For example, the painted surface has excellent corrosion resistance, good mechanical properties and high chemical resistance. The process uses trication zinc phosphating as a conversion layer and meets the high-quality requirements from industries like the automotive. A cataphoresis coating, possibly in combination with a powder coating, is suitable for most different applications and meets all current applicable requirements.

What is KTL used for?

  • Parts used in or under the chassis and body
  • Primer for solar panel clamps
  • Brake pedals
  • Fluid pipes for oil levels
  • Clamps and hinges
  • Roof profiles
  • Trunk rollers
  • Parts for electric bikes
  • And much more
NFB Partner Partner In Coating 9

The process of cataphoresis painting

After stretching the products, we hang them on the belt to receive an optimal pre-treatment, tailored to the customer’s wishes, the final application or the manufacturer’s standard. This is how we guarantee a high-quality product right from the start. A series of pre-treatments distributed over 11 zones is automatically activated. The most critical pre-treatment steps are degreasing, rinsing, activation (zinc phosphating) and passivation. After this, the products go through a 75,000 liter lacquer bath.

Varying KTL layer thicknesses
By applying an electrical current (voltage), the lacquer layer is built up via cataphoresis lacquers. The layer thickness is determined and built up by the voltage setting and keeping the other process parameters constant. A layer thickness of 20 ±5 µm is the most common, but different thicknesses are also possible. With Dickschicht Kathodische Tauch Lackierung (D-KTL) we can even achieve layer thicknesses of up to 35 µm.
The lacquer layer is fixed at 150°C – 200°C to achieve its final properties and appearance. Incidentally, the oven is designed in such a way that heavier parts can also be processed.