Home /
Search 🔍
the Site
pub Where the world gathers for
plating, anodizing, & finishing Q&As since 1989


Salt fog protection for different types of plating

October 23, 2008

Dear Sir,

I did plate a mild steel part with a silver plate (3 micron) over a electroless nickel plate (10 micron). When I send for the salt fog test, it found that it failed for this test. May I know is the nickel a good protection for the corrosion? What about if the plating spec change to cu-nickel-silver? Will this be better than the previous one as I did? Thank you.

CC Tang
plating house engineer - Malaysia

October 23, 2008

Hi, CC. Salt spray testing is a QC measure meant to help assure that a successful plating process or specification has not deteriorated. It was never meant to indicate which of two different types of plating or coating is more robust in the real world, and it can't do that. Accelerated corrosion conditions are fundamentally different than real-world conditions, and anti-corrosion mechanisms that work in the real world, like the formation of films of tough carbonated corrosion products, won't form in the salt fog chamber.

I don't think an underlayer of copper will substantially improve the performance of an electroless nickel coating, but making it just a little bit thicker, and consequently less porous, might. Good luck.


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

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:

Chemicals &
Consult'g, Train'g
& Software

About/Contact    -    Privacy Policy    -    ©1995-2023 finishing.com, Pine Beach, New Jersey, USA