Characteristics of galvanized layer trivalent chromium passivation film

- Sep 27, 2018 -

The characteristics of the galvanized layer trivalent chromium passivation film are summarized as follows:

1. The trivalent chromium passivation film is relatively easy, the process is simple and stable, and films of different colors, such as colorless, blue-white, iridescent, black, etc.;

2. The film layer has no self-repairing property, and the passivation film is thinner than the hexavalent chromium passivation film, but the passivation film is thicker on the zinc alloy plating layer.

3. The corrosion resistance of the trivalent chromium passivation film is not as good as that of the hexavalent chromium passivation film, but the passivation film on the zinc alloy plating layer is often superior to the hexavalent chromium passivation film.

4. Since the trivalent chromium passivation film is thin, in order to improve the corrosion resistance, it is usually supplemented by a closed post treatment.

5. The temperature resistance of the trivalent chromium passivation film is better than that of the hexavalent chromium passivation film. When it is heated to 200 ° C, it can still maintain 70% of its original corrosion resistance. However, the hexavalent chromium passivation film is heated. When it is above 80 ° C, some film dehydration cracking will occur, which will affect the corrosion resistance.

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