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Cast Aluminium component with Trivalent Chromating not withstanding 48 hour salt spray test

We are in the process of converting Hexavalent plating to Trivalent chromating on our aluminium component. We have undergone various trials and still we are unable to come to a solution. The material is ADC12 with Silica about 10~11.5%. The process followed is, after casting it is subjected to a rubber bonding process where the oven temperature is around 200° C. After that it is machined and finally it is subjected to Trivalent chromating and then assembly of other components to it. The appearance is also dark. Kindly give your valuable suggestion to find a solution.

Navaroj T
Product Designer - INDIA
June 14, 2011

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