No registration, no passwords; no pop-up ads -- just aloha, fun, & authoritative answers.
As an eBay Partner & Amazon Affiliate we receive compensation for qualifying purchases.
Home /
T.O.C.
FAQs
 
Good
Books
Ref.
Libr.
Advertise
Here
Help
Wanted
Current
Q&A's
Search 🔍
the Site
pub  Where the world gathers for
plating, anodizing, & finishing Q&As since 1989





-----

Material selection for corrosion prevention in cyanide solutions





I wish to electrowin silver from silver cyanide at pH 14+. What anode material can you suggest. 316SS corrodes rapidly.

Steve Lloyd
- Ashmore, QLD, Australia
2001


The SS sheet or mesh anodes of 316 alloy commonly used for electrowinning, should not corrode rapidly, in my experience, unless you are using excessive hypochlorite, or similar chlorine source chemicals, to destroy the cyanide. SS will eventually pit in any chlorinated solution, even diluted like seawater. The rate is time, temperature and concentration directly dependent, and any sludge that may stick to the SS, could cause concentration cells to form under it. Also, look closely at how you remove the electrowon material off the SS. Could it be you are damaging the surface, making it susceptible to corrosion? Good Luck.

W. Carl Erickson
- Rome, New York
2001




(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:

 
Jobshops
Capital
Equipment
Chemicals &
Consumables
Consult'g, Train'g
& Software


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