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topic 8419

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


(2001)

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
Anders Sundman
3rd Generation in Plating
Consultant - Arvika, Sweden



(2001)

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

Kaushik
- Charlotte, North Carolina


April 4, 2011

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, finishing.com
Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey



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