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How Can Hard Chrome Solutions be Purified

2001

Dear Sirs:

I need to know by your experience which is the best and simplest method to purify hard chrome solution from contaminants, mainly Fe, Cr3 and some Cu.

If there is more than one equipment to do the job, please specify advantages and disadvantages of each, including if they generate spent chrome solution that must be wastewater treated.

Thanks in advance.

Oscar Infante
- Santiago-Chile

Hi Oscar.

Contamination is easy to remove from Chrome solution by Porous Pot or dialysis. You can remove trivalent by electroplating a small rod for 24 hour with low current. The area must be less than the anode area is.

Regards

Anders Sundman
4th Generation Surface Engineering
Consultant - Arvika,
Sweden
2001

How about trying low current density plating on a small corrugated cathode.

Kaushik
- Charlotte, North Carolina
2001

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Hi, Kaushik.

Low current density "dummy" plating like that is useful for some plating solutions like nickel plating processes, but to my knowledge it is not applicable to chrome purification.

Regards,

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
April 4, 2011