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

World's #1 finishing resource since 1989
No login needed: Chime right in

topic 59177

Hard Chrome plating and small holes



February 26, 2013

Q. I'm currently working on a design that has a metal part (latch) that is going to be exposed to the elements (outside location). Latch is made from O1 steel and it is under heavy load. Currently we are plating it with hard chrome for rust protection and wear resistance. The problem that we are facing is that the latch has several holes cut in it (1/8" diameter) which never get any hard chrome deposit in it and become the source or rust. I was wondering if there is any coating/plating that can be applied in a small hole?

Art Grig
- Tampa, Florida, USA


February 26, 2013

A. Hi Art. Hard chrome plating may well be appropriate for this latch . . . but when someone talks about rust protection when exposed to the elements, we have to question whether they have made the best selection as hard chrome plating doesn't offer the corrosion resistance of alternatives like electroless nickel.

If you are confident that hard chrome plating is the correct specification, some people do iron phosphatizing immediately after chrome plating, which would allow you to paint the holes.

Regards,

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


March 1, 2013

Q. Thank you for your thoughts. This application has a lot of force applied to a small area (a tooth of a latch). When latch is moved the "tooth" disengages and the weight is released. The area of the tooth that is engaged is roughly about 0.25"x0.06". So low friction and wear resistance was important in selecting the coating. Would nickel be hard enough for this application?

Art Grig
- Tampa, Florida, USA


March 4, 2013

A. Hi. Electroless nickel is quite hard and may be hard enough. Are the teeth hardened? If not, chrome plating may not be doing much good anyway. If so, a better approach might be salt bath nitriding / QPQ process.

Regards,

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


March 1, 2013

Mid Phos electroless nickel is the answer.

vikram dogra
Vikram Dogra
Irusha India - Chandigarh, India


March 4, 2013

A. Hi,

Maybe the hydrogen gas. Turn the part's hole to left or right (horizontal) and plate the hole.

Regards

Anders Sundman
Anders Sundman
4th Generation Surface Engineering
Consultant - Arvika, Sweden


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 SEARCH for Threads about ... My Topic Not Found: Start 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    -    ©1995-2021 finishing.com, Pine Beach, New Jersey, USA