Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ

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

The authoritative public forum
for Metal Finishing since 1989
-----

Leakage between seal and Zinc-Nickel plated surface

We use barrel plated COVENTYA PERFORMA 280 Zn-Ni with COVENTYA FINIDIP 128 passivation on steel parts. Thickness approx. 10 micrometers.
In some parts we observe a much higher He leak rate when we measure the leak rate between an HNBR seal and the plated surface.
Under the microscope the plated surface looks cracked (i.e. like dried mud) and that may be the cause?

1. How permeable is a Zn-Ni surface for gas?
2. What can we do to make it less permeable?

Jaap Hoftijzer
Product Designer - Almelo, The Netherlands
May 6, 2011

(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: