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

pub
Free personalized metal finishing help!


Red rust on nickel-brass plated mild steel screws



(-----) 2007


Hello

I am from India and I would like to know how we can prevent RED RUST on Brass Plated Mild Steel Screws?

After brass plating on mild steel screws has been done they look very bright and yellowish like brass.

But after we assemble them into our Brass Terminals and Ship them to our buyers the screws catches RED RUST.

We investigated with the plater but even after a good copper + nickel base on mild steel screws proir to brass plating these screws catches RED RUST.

I shell request you to please guide me how we can prevent this red rust ?

Is there any Lacquer or chemical process after brass plating with the help of which we can prevent these screws getting red rust ?

Await for your answer

Thanks

Regards

Mr Virat Rabadia

Virat Rabadia
brass works - Jamnagar, Gujarat, India
^


2007

It sounds to me like you have a classic case of brass dezincifciation. This is quite common in brass parts in some water supplies and is caused by the water dissolving out the zinc from the brass to leave a copper matrix or sponge. This sponge has no strength and can easily fall apart. I therefore suspect the brass plated screws are being exposed to alkaline conditions that allow the zinc to be dissolved.
Perhaps you could comment on when this "red rust" appears and how the parts are stored?

trevor crichton
Trevor Crichton
R&D practical scientist
Chesham, Bucks, UK
^

none
finishing.com is made possible by ...
this text gets replaced with bannerText
spacer gets replaced with bannerImages

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    -    ©1995-2022 finishing.com, Pine Beach, New Jersey, USA