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!


Stainless Steel Electropolish Tank Maintenance



(-----) January 9, 2008

Hello, and thanks in advance for any info/help you can give me.

I have started a new job at a small company who makes parts for customers in the semiconductor industry, where I'm most focused is on their electropolishing step. Currently they are using a purchased chemical that contains phosphoric and sulfuric acids. Right now they are only performing specific gravity testing on the tanks. They don't do huge batches at at time, and when they are internally polishing the parts they are only doing one at a time.

My question is: what is the best maintenance plan for these tanks? I've read on here somewhere that in addition to specific gravity testing there should be titrations done and a dissolved metal analysis. And what should I be looking for?

On a side note, I'm not sure that the ventilation on the tanks is up to where it should be, does anyone know what the cfm should be for open tanks?

Thanks again for any help!

Angie Wicklund
Chemical Tech - Sauk Rapids, MN, USA
^


January , 2008

Hello, Angie. You are apparently using a proprietary electropolishing process. In general, proprietaries cost more than generic processes but offer the advantage of support from the supplier. At the least your vendor will offer a "technical data sheet" with recommendations. In addition, most of the general plating texts offer at least some coverage of electropolishing; the Electroplating Engineering Handbook has a good chapter.

Required ventilation rates are based on a number of things including the hazard of the chemicals, but the "aspect ratio" is so critical that a recommended CFM cannot be offered without it. Aspect ratio is the length over the width. If your tank was, say, 6' x 2' and you had exhaust hood(s) running along the 6' dimension, the aspect ratio would be .33 and it would be relatively easy to ventilate. If the hoods were along the 2' dimension, the aspect ratio would be 3, and extravagant ventilation rates would be required. Best to send a sketch and a photo to an experienced exhaust system builder like KCH Engineering. Good luck.

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

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