Rotational immersion method

The rotational dip coating process creates locally compacted edge zones and complex geometries on rotationally symmetrical components, which have a direct impact on subsequent coating processes. In particular, roughness, residual stresses and possible churning significantly determine the wettability and adhesion of coatings.

Appropriate pre-treatment is therefore required for a reliable surface coating process. After forming, forming media must be reliably removed and the surface must be leveled by pickling or blasting processes. This is the only way to achieve uniform activation, which is a prerequisite for homogeneous coating formation.

In cathodic dip coating, the geometries created by the rotational dip coating process place special demands on the flow and wetting. Undercuts and compacted areas can influence paint deposition and lead to differences in coating thickness. Close coordination between the forming process, pre-treatment and cathodic dip coating is therefore crucial to ensure a uniform coating, high adhesion and reliable corrosion protection.