Process Chromating
Mainly used for corrosion protection especially of zinc electroplated steel parts, but also directly on steel, aluminium and manganese. Decoration is possible thanks to the many colour variants (blue, yellow, olive, black, transparent).

The blue version is the cheapest, but the thinnest and gives the least corrosion protection.
Yellow, black and olive are a little more expensive but thicker (better protection). Black and olive have also optical advantages (no reflection).

The conversion of the metal surface into a surface containing a mixture of chromium compounds is generally performed by dipping, but also by spraying or brushing.
Typical thickness is less than one micron (nanometer field).
Danish Name Kromatering
Category Surface treatments, Electroless plating
Materials Substrates:
Zinc (steel electroplated parts)
Steel
Aluminium
Manganese
Chromium (coating)
Typical products Cover
Glass frame (Cr)
Competing processes Phosphating
References Alumatic A/S
Arbeitsgemeinschaft - Galvanotechnik
Blasberg Oberflächentechnik GmbH
Galvanisk Kompagni
Holzapfel Metallveredelung GmbH
Price notes The main application (and almost the only) for chromating is as last step for zinc plating of steel parts. Being the cost of this step very low, it is negligible compared to that of zinc plating (see zinc plating), and consequently that of the part.
Price date March 1997
Environmen- tal notes Use: Chromate increases seriuosly the risk of skin cancer.
Photo Thomas Nissen (Computer graphics)
Copyright © 1996-2003 Torben Lenau
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