No passwords, no registration, no paywalls, no popups, no AI

As an Amazon Associate & eBay Partner we earn from affil links

finishing.com -- The Home Page of the Finishing Industry

Search our quarter-million Q&As

Home of the finishing HOTLINE since 1989

-----

Brown sludge in cadmium cyanide plating solution

October 19, 2009

I have a cadmium plating solution that has started to precipitate out a light brown fine sludge onto the bottom of the tank and on the cadmium anode balls.
It is now starting to impact on plating times, the bath is run in a jobbing style shop, i.e. non automated doing aerospace work.
The solution although old has been maintained throughout its life with weekly analysis
with component concentrations at:-
Cadmium 20.0 g/l
Cyanide 109 g/l
Hydroxide 11.8 g/l
Is it just a matter of filtering out the solid, or a sign of something more serious?
I have consulted the Canning Handbook, it has nothing to say about this phenomenom.

Mark Lees
chemist - Isle of man United Kingdom

Sorry! Finishing.com is temporarily Read-Only.
Ted Mooney is retiring but I have several offers to take it over.
We're working hard to make sure we find it the best new home.

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: