Wear and Corrosion Protection

High loads on components, such as abrasion or chemical attack, can occur either across the entire surface or only in localized areas. To counter these effects, the stressed areas are either surface-hardened or provided with a corrosion-protection coating.
The primary objective is to restore worn components to their original geometry, while reinforcing the affected areas with higher hardness in order to increase service life during subsequent operation.
For new components, a small amount of the original material is first removed to create space for the coating. The part is then coated, and finally the original contour is restored.

Refurbishment of Worn Components


The wear zone of conveyor screws is located at the outer edge. After the screws have worn in operation, the affected areas can be rebuilt by weld overlay with increased hardness and restored to their original contour.


The costs for refurbishment are significantly lower compared to replacing the entire conveyor screw.


Similar applications include cutting knives in the wood and paper industry, filter plates with hardened inserts, and comparable components.

Refurbishment of Eccentric Screws


Eccentric screws are wear parts. Damage and material loss from the screw lead to reduced conveying capacity, so that the screws must be replaced once a certain degree of damage is reached. However, worn screws can be refurbished. This becomes increasingly economical with larger screw sizes or when pump repair involves significant effort.

Scope of Work

  • Even removal of the worn surface
  • Fusion of a surface layer into the base material
  • Machining of the applied material and restoration of the original contour

The material of an eccentric screw is normally a corrosion-resistant stainless steel. However, due to its alloying elements, the material exhibits relatively low strength and surface hardness. As part of the coating process, the applied layer increases hardness, resulting in extended service life. If required, corrosion resistance can also be improved.