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METAL COATINGS

ZWEZ-Black / -Black CU / -Black ZN

Blackening/black oxide finishing of iron, steel, cast iron, copper and zinc die-cast alloys

Between nothing and something, but pitch-black and rust protecting, on all iron materials without changing the dimensions - that is steel blackening with ZWEZ-Black. A technology that has been known for decades, and through continuous further development commands an important role in surface treatment processes even today. The ZWEZ R&D department has played an important part in this innovation.

ZWEZ-Black today offers:

  • with our new products a more intense blackening in a shorter time, even more corrosion protection 
  • blackening of all cast-iron materials
  • blackening of stainless steel
  • blackening of brass solder during steel blackening
  • protection against spraying and foaming of the bath
  • fluid blackening concentrate for bath-regeneration via dosing pump

In principle there are similar processes for pitch-black finishing of copper and zinc alloys.

Special products for pre- and post-treatment optimise these processes:

  • ZWEZ-Black-Cond as preheating bath before applying ZWEZ-Black, for even better and quicker blackening
  • ZWEZ-Rinse for the posttreatment: neutralisation and passivation
  • ZWEZ-Oil E and ZWEZ-Oil D for subsequent rust-protection oiling