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

-----

Corrosion encrusted U.S. pennies

I have just found several hundred U.S. pennies which are heavily encrusted with some type of corrosion. Any suggestion concerning a method of removing the encrustation will be appreciated.

John Willy
- Galveston, Texas, U.S.A.

First of all check out what the pennies are made from. Are they the more recent sandwhich type or copper? Also there was some zinc back in 1941. Normally heavy corrosion needs mechanical efforts to remove oxidation plus; however, if you are dealing with the sandwhich type, the coating will not hold up to mechanical abrasion for very long because you are removing the plating. Normally I use a small vibratory mill (tumbler) with treated dry organic media.

AF Kenton
retired business owner - Hatboro, Pennsylvania

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: