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Role of hexavalent chromium in the inhibition of corrosion of aluminum

Hello, I'm currently working on a great subject: the replacement of Chromium (VI) due to European Laws. In fact, we work on aluminum evaporators and we must avoid Cr (VI) contamination coating application. Thus, we apply a drying during the process and thanks to this drying we don't have Cr (VI) anymore ( it seems). The problem is that we have a lack of performance concerning corrosion and I want to know the real Role of hexavalent chromium in the inhibition of corrosion of aluminum. If somebody can give me information concerning this subject, I would be very happy. Thank You Cyril Horlaville

Cyril Horlaville
- Le Mans, Sarthe, France
2003

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Hi Cyril,

Chromates work well at inhibiting corrosion because they are effective at passivating a metal surface.

George Gorecki
- Naperville, Illinois
2003