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Oxide layers on steel components are becoming increasingly important in technology, as they:


- always provide outstanding corrosion protection

- can increase wear resistance (in combination with nitriding)

- improve running characteristics (in combination with nitriding)

- have a strong optical effect due to their dark to black colour


Controlled oxidation of your components at HÄRTHA creates a compact oxide layer that primarily grants good corrosion resistance and outstanding optics. The dark colouring can also be used instead of burnishing, which despite having a black surface displays nowhere near as good corrosion protection. Furthermore, oxidation works on materials where even burnishing is hardly possible any more.


Oxidation is performed immediately after nitriding or nitrocarburising. The decomposition of iron nitrides and oxidation of iron creates this, highly chemical-resistant Fe3O4 layers, with any pores in the compound layer being filled with oxide. The oxide layers have an attractive black to anthracite-coloured appearance.


The ratio of the specific volumes of Fe3O4 oxides and the iron nitrides provides very good conditions for the formation of bonded, passivating and therefore corrosion-resistant surface layers.


The benefit of nitrided compound layers as regards low tendency towards "seizing" with metallic friction partners is increased further through oxidisation.


Download process as pdf


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