netneut
finishing.com -- The Home Page of the Finishing Industry
A website for Serious Education, promoting Aloha,
& the most FUN smiley you can have in metal finishing


Finishing.com has been free for 22 years,
but without net neutrality we could soon
cease to exist. Do us a solid, click on
the banner, and contact congress today!
HomeFAQsBooksHelpWantedAdvertiseForum
topic 12072

E-Coating Oxidized Brass


 

We are currently trying to develop an e-coat process (to replace clear lacquer) over the top of antiqued (oxidized) and relieved (highlighted) brass. The problem that is being experienced is the dissolution of the antique. Do you have any suggestions to successfully e-coat oxidized brass and yet maintain the original look?

Scott Schnau
- Grand Rapids, Michigan


 

We have a small E-coat line in which we run antique brass almost every day without a problem. You might want to check your predip to make sure its not too strong or bypass it totally. It also may depend what vendor you are using or even what type of oxidizer you are using.

Chris Faeth
Los Angeles California USA


 

I appreciate your feedback. What type of oxidizing chemicals are you using on the brass? Is it a selenium / copper based mixed acid or is it a nickel sulfate based system?

Scott Schnau (returning)
- Grand Rapids, Michigan


 

Hi,

In the past, we heavily brass plated (45 min racked) our pewter alloy castings, oxidized, and hand relieved our medallions on a linen wheel with wet pumice yielding a beautiful antique finish which all too often bled cyanide. I became so frustrated with this problem that I put in a small E-coat line with a "brass dye" solution.

I couldn't be more pleased.

Now we oxidize the unplated alloy, relieve, and then E-coat to a beautiful "brass" finish which does not affect the antiqued highlights and shadows. There are many other benefits. We can obscure the antiquing but only after 15 microns of thickness. Remember ours is not clear but rather brass dye added.

Good Luck,

Ken Fefferman
- Harwood Hts, Illinois


 

We are using AT800 Antique Black. The E-coat bath we are currently using is from Technic. I believe the AT800 is a copper base solution but I'd have to check the TDS.

Chris Faeth
Los Angeles California USA



This public forum has 60,000 threads. If you have a question in mind which seems off topic to this thread, you might prefer to Search the Site

ADD a Q or A to THIS thread START a NEW THREADView This Week's HOT TOPICS

Disclaimer: It's not possible to 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 may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental ComplianceTesting Svcs. & Devices


©1995-2017 finishing.com     -    Privacy Policy
How Google uses data when you visit this site.