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Yellow Chromating for zinc alloy

2004

We are having a requirement of Yellow Chromate on Zinc Die Cast. We would like get the process details & Chemical composition of Acids to be used for Yellow Chromating. Our Zinc alloy combination is given below:-

Al - 3.8%
Cu - 1.25%
Fe - 0.05%
Zinc - 94.82%

Appreciate your immediate response.

Thanks and Regards

Unnikrishnan M
electronics mfgr - Cochin, Kerala, India

Several formulations are available. You can either obtain these chemicals from metal finishing industries or develop one. You might wish to have a look at ASTM standards

V.S. Raja
- Corrosion Science and Enginering, IIT Bombay, Powai, India
2004

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