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Ted Mooney, P.E. RET

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Yellow chromating

I am using yellow chromating chemical for the treatment of aluminium(dip application). The dip application is taking 10-15 minutes for the conversion to take place. Can anybody help in achieving the same in a quick time? What should I add to the bath to get the chromating quicker.

Ramchander Gegula
- Hyderabad, A.P, India
2002

While chromating solutions are based on chromic acid and sulfuric acid, Mr. Gegula, there is more to a practical solution than that--as you have discovered. The accelerators and stabilizers are the subject of patents in some cases and trade secrets in other cases.

However, heating the chromating solution to 80 degrees F and air-agitating it will speed up the process a bit.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2002

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