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

Problem? Solution? Chime right in!
(perhaps the world's last 'no registration' site)

-----

"Hard chrome on copper blisters at 130C"



2005

We have a 1" x 1" x 1" hard-chrome plated copper heater block that is developing blisters when the temperature is held at 130C. The plating ranges from 0.0002 to 0.001 inches thick. The blisters eventually fall off (they actually pop off at times), leaving 0.25 to 0.5 diameter unplated copper. The block is heated by a cartidge heater inserted into a hole in the block. Temperature is controlled with a PID controller and a thermocouple inserted into another hole in the block. We call our MIL spec hard chrome, but have a serious problem with the result. We'd greatly approciate any suggestions as to what is causing the problem so we can help our plater solve the problem.
Thanks

John Bussan
manufacturing - Chicago, Illinois
^


2005

It's admirable to want to help advise the plater how to fix it, but probably not realistic to expect that someone can give you a quick tip that will fix things. But, to give it a try, please remind your shop that copper must not be reverse etched because this causes copper to dissolve at just the wrong time, and makes the chrome non-adherent. Rather, after cleaning, which could be as simple as Pumice [affil. link to info/product on Amazon] scrubbing and rinsing, the copper must enter the chrome tank "live" (cathodic).

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


2005

Thanks Ted!

John Bussan
manufacturer - Chicago, IL , USA
^

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