Home /
T.O.C.
FAQs
 
Good
Books
Ref.
Libr.
Advertise
Here
Help
Wanted
Current
Q&A's
Search 🔍
the Site

World's #1 finishing resource since 1989
No login needed: Chime right in

topic 8413

REQUIRE COPPER SURFACE FINISHING WITH HOMOGENEOUS COLOR



2001

Dear Sir/Madam,

I would like some help on the following issue, concerning copper surface finishing. We have tried to use strong cleaning agent, namely Dynasolve 218 (pH value around 1) to get rid of the silicone stuck on the rim and surface of some thin copper frames. After dip into this cleaning agent for two hours, we will dip the copper frames into alcohol for ten minutes because the cleaning agent is soluble in alcohol. Then we rinse the copper frames by water and blow off the water by compress air and put the copper frames into oven at 80 °C for 20 minutes. This works perfectly and all the silicone has gone. However, it brings another problem where the surface of the copper frame will change color within one or two days, which looks unpleasant. I know it is something related to the oxidation of the copper frame. What we want is more even color on the surface of the copper frame, as long as the color is in the same tune, no matter darker or paler is still O.Kay for us. Could you instruct us how can we do that?

Do we need to neutralise the acidic cleaning agent by some mild alkaline such as soap water before rinsing by water? Or do we need other treatment(s)?

Awaiting your response.

Best regards,

Kam Chuen LEE
- Hong Kong


2001

Your problem indeed is related to the oxidation of copper. You need to passivate the metal surface in order to give it a long term protection.

S. Y. Yuen
- Hong Kong, China


2001

I'm not absolutely sure, but I think that a final dip in 5% acetic acid and then drying should give some sort of short term passivation on a fresh copper surface.

Mark Camilleri
- Malta


2006

DEAR SIR,
I AM A METAL ARTIST...AND HAVING WORKED IN COPPER , AM AWARE OF ITS QUALITY OF OXIDATION. I WISH TO KNOW HOW KITCHEN OR BATHROOM SINKS OF COPPER MAINTAIN THEIR ORIGINAL SHEEN..AND COLOUR..?

REGARDS,

ANURADHA PRABHAKAR
HANDICRAFTS - LUDHIANA, PUNJAB, INDIA

none
finishing.com is made possible by ...
adv. 
spacer gets replaced with bannerImages

Q, A, or Comment on THIS thread SEARCH for Threads about ... My Topic Not Found: Start 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    -    ©1995-2021 finishing.com, Pine Beach, New Jersey, USA