Wear and corrosion protection

Wear and corrosion protection

A high stress on components such as abrasion or media attack can occur both over the entire surface and partially. To counteract these attacks, the contaminated area is either hardened or provided with a corrosion protection coating. The primary aim is to rebuild worn components to their original geometrical condition, but make the attacked areas harder to increase the service life when they are used again coated and at the end the original contour restored.

  Reconditioning of wearing parts  

The wear area of screw conveyors is on the outer edge. Once the screws are worn during operation, they can be welded on at the wear points with greater hardness and restored to their old contour. 



The costs for reconditioning are significantly lower than those for replacing the entire screw conveyor. 


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

  Processing eccentric screws  

Eccentric screws are wearing parts. Damage and erosion of the screw lead to a reduction in the conveying capacity, so that the screws are replaced once they reach a certain degree of damage. However, the worn screws can be reconditioned. This makes economic sense the larger the screws are or the greater the cost of repairing the pump.



Service description

  • Uniform removal of the worn surface
  • Melting a surface layer into the base material
  • Processing 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 the alloy components, the material has a low strength and surface hardness. As part of the coating process, the hardness is increased by the applied material, which leads to a longer service life. If necessary, the corrosion resistance can also be increased.
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