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

HomeFAQsSuggested
Books
Help
Wanteds
Advertise
on this site
FORUM
current topics
Live! From beautiful Pine Beach New Jersey: Welcome to the world's most popular metal finishing website

topic 18866

Brass over zamac


2003

I have a lot of problems with electroplating brass over zamac like small brown points that appear over the plated surfaces after few days. I use Cr+6 non electrolitic during 10 seconds over brass but the results are not so good.

Paulo
- Caxias do Sul, RS Brazil


2003

Your brass plating as being cyanide based, are like all cyanide solutions, very prone to "bleed out", therefore clean and adequate rinsing is the key to prevention of the so called black spots or spotting out. Possibly the problem is really in the rinses after plating, instead than ahead into the process. Magic solutions like Chrome+6 dips do not help unless you improve dramatically your post rinses.

Glad to be at your services.

Domingos J C Spinelli
- S.B.Campo, Sao Paulo, Brasil



If you have a question in mind which seems off topic, please Search the Site

ADD a Q, A, or Comment on THIS topic START an UNRELATED topicView CURRENT 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


©1995-2019 finishing.com, Inc., Pine Beach, NJ   -   About finishing.com   -  Privacy Policy
How Google uses data when you visit this site.