Aloha, fun & authoritative answers -- no cost, no registration, no passwords, no popups
(as an eBay Partner & Amazon Affiliate we earn from qualifying purchases)

Home /
T.O.C.
Fun
FAQs
Good
Books
Ref.
Libr.
Adver-
tise
Help
Wanted
Current
Q&A's
Site 🔍
Search
pub  Where the
world gathers for metal finishing
Q&As since 1989



-----

Non-Tarnish FINISH





We import belt buckles from India. What FINISH absolutely ensures there will be NO-TARNISH? Lacquered Brass, Gold Plate ....... Zinc... I have seen many tarnished samples....

Nela Kash
- Los Angeles, California, USA
2003



2003

Precious metals (gold, rhodium) don't tarnish. But even then the precious metal has to be thick enough and properly applied in order that an undercoat does not tarnish through any porosity in the top coat. Even then there is the possibility of stains that are not tarnish but may look like tarnish.

There is nothing you can specify which will put all of your QA people out of work though :-)

Ted Mooney, finishing.com
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey



2003

Nela Kash,

This is a very general letter. Here are some questions you need to answer, then go to a Plating consultant if you still need a solution to your problem.
- What is the base metal.
- What is the plating process sequence.
- What is the final plated deposit.
- Which lacquer is used.
- How is it applied. The process.
- What is the mode of drying.
- What is the mode of packaging

What is the type of tarnish observed. How long does the part remain tarnish free. The problem of tarnish is solvable with Proper identification of causal factors, Patience, Right technique and a choice of the right materials.

Regards,

asif_nurie
Asif Nurie [deceased]
- New Delhi, India
With deep regret we sadly advise that Asif passed away on Jan 24, 2016



Firstly, if the product is a cheap brass casting,with any porosity, an initial plating with nickel should seal the metals pores prior to gold plating. Make sure to use the maximum plating time for both. On the subject of lacquering, there are products that will withstand corrosion and abrasion if baked and dipped two or three times.

Mark Hunter
- N.S.W., Australia
2003


none
this text gets replaced with bannerText
spacer gets replaced with bannerImages


(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"