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Removal of rouging and blacking

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rouging-avant-traitement rouging-apres-traitement

The principal factors that cause rouging are:

  • Hot water systems, pure vapour, and ozonated water.
  • The presence of ferric ions (solder oxides, lower quality materials…).


Initially, rouging (iron oxide) appears in the passive layer of the material, and when the rouging accumulates under high temperatures it transforms into blackening (magnetite), even more difficult to remove.
Derouging is a dynamic chemical treatment carried out, if possible, under heat followed by passivation. Deblackening is a targeted scouring operation followed by passivation.This process has little effect on the roughness of the treated material.

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