Coating · E-coat

Cathodic dip coating: corrosion protection from the dip tank

Cathodic dip painting (e-coat) coats a component where spray processes cannot reach: in cavities, folds and at edges. At August Bertrams GmbH you receive e-coated sheet metal parts straight from production — designed, manufactured and finished under one single responsibility.

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What cathodic dip coating achieves

In cathodic dip coating, the component is lowered into an electrically conductive dip tank; driven by direct current, the paint is deposited uniformly across the entire surface — even in cavities and at inner edges. The layer is then baked on in the oven.

The result is a closed, characteristically very uniform protective film that serves as a stand-alone corrosion protection for parts installed out of sight — or as a primer beneath a powder coating (duplex system) for components permanently exposed to the weather.

  • Uniform film thickness even at edges, folds and in cavities
  • High corrosion protection with a low coating build-up
  • Ideal primer for powder coating (duplex system)
  • Economical from medium production runs upwards thanks to an automated throughput
Sheet metal frame before cathodic dip coating in production

Typical applications

Vehicle and agricultural machinery construction

Frames, beams and assemblies that are installed out of sight and must be permanently protected against moisture.

Plant and mechanical engineering

Housings and structural parts where corrosion protection matters rather than decorative visible surfaces.

Duplex system

E-coat as a primer plus powder coating as the top layer — for parts used outdoors with high visual requirements.

Designed for the e-coat process — from the very start

So that the dip tank reaches everywhere and drains again, a component needs drainage openings and well-thought-out suspension points. Our engineering and production planning takes this into account already at the first draft — so no part is manufactured that cannot later be coated cleanly.

Frequently asked questions

What is cathodic dip coating?

E-coat stands for cathodic dip painting: the component is immersed in an electrically conductive paint bath, the paint is deposited uniformly on all surfaces by direct current and is then baked on in the oven.

What is cathodic dip coating particularly suited to?

To components with cavities, folds and inner edges that spray processes cannot reliably reach — such as frames and beams in vehicle construction. And as a primer beneath a powder coating (duplex system).

Is e-coat sufficient as corrosion protection on its own?

For parts installed out of sight, as a rule yes. For components permanently exposed to weather or mechanical stress, we recommend the duplex system of an e-coat primer and a powder top layer.

Can Bertrams supply the cathodic dip coating directly together with manufacturing?

Yes. You state the surface in the request, we manufacture the part suited to the e-coat process (drainage openings, suspension points) and deliver it coated and inspected — one order, one point of contact.

Request a component for cathodic dip coating

Send us your drawing, quantity and preferred deadline — we will check feasibility and get back to you with a quote.