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Charcoal filter problems with nickel sulfamate plating




Q. Would a Polypropylene/Carbon Filter with a one micron rating be sufficient for a nickel sulfamate bath? My nickel is getting brittle.

Ed Schuster
hobby - Louisiana, California
2006



simultaneous replies

A. I would try a 10 micron filter. The micron rating is from the polypropylene which basically keeps the activated carbon inside the filter. A 1 micron filter will filter at a very very slow rate.

James Watts
- Navarre, Florida
2006


A. Carbon polishing with carbon filter packs is a good idea, but keep in mind one cartridge can only treat so much solution. If the bath is 20 gallons or more I like to change the carbon pack every 2 hours. One micron rating should be fine. Low current density (3-5 asf) dummy plating could do some good. A stress reducer may have to be added to the bath if the problem persists. If applicable, check with your Ni supplier regarding the stress reducer, and the amount that should be added. Good Luck!

Mark Baker
Process Engineer - Syracuse, New York
2006



Q. I only have a 2 gallon bath, the filter is rated for 1 GPA
I am using a water filter set up, its all made from Polypropylene.
I did not know there is a stress reducer available, I will look into it.

How many times can this be used for 2 gallons and how long do I run it for? I will do a additive "a" test on the bath afterwards.

Does anyone know how to make a fiberglass part conductive other than silver paint? I think the paint is what's contaminating the bath.

Ed Schuster
- La, California
2006



"Standards and Guidelines for Electroplated Plastics"
by American Society for Electroplated Plastics

on AbeBooks

or Amazon

(affil links)

A. Hi Ed. The ideal way is the way automotive companies do it, i.e., the standard plating on plastics protocol of palladium chloride, followed by tin chloride, followed by electroless nickel plating. .

But that is by no means an easy process. Good luck with it.

Regards,

Ted Mooney, finishing.com
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
September 2013




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