Aloha, fun & authoritative answers -- no cost, no registration, no passwords, no popups
(as an eBay Partner & Amazon Affiliate we earn from qualifying purchases)

Home /
Site 🔍
pub  Where the
world gathers for metal finishing
Q&As since 1989


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

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

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

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

"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.


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

(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories:

Chemicals &
Consult'g, Train'g
& Software

About/Contact  -  Privacy Policy  -  ©1995-2024, Pine Beach, New Jersey, USA  -  about "affil links"