No registration or passwords; no pop-up ads -- just aloha, fun, & answers.
(as an eBay Partner & Amazon Affiliate earns from qualifying purchases).
Home /
T.O.C.
Fun
FAQs
Good
Books
Ref.
Libr.
Advertise
 
Help
Wanted
Current
Q&A's
Site 🔍
Search
pub  Where the
world gathers for metal finishing
Q&As since 1989



-----

Anodising bath agitation




2002

Dear Sir,

I am working as a chemist in an anodising plant in Kolkata, India. We are going to construct a new anodising(Al.) bath. Please suggest me the technique to achieve good bath agitation.

Thanking you,

Abhijit kr. Datta
- Kolkata, West Bengal, India



There is no reason you can't use air agitation in an anodizing bath, and that is usually the most cost effective approach. There are any number of "how to" articles about air agitation in the plating journals and books.

Ted Mooney, finishing.com
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2002



Dear Abijit,

To have uniform agitation you can either have a small twin lobe compressor . Alternatively if you have an acid circulating system using an acid pump then there are nozzles which could be fitted on the discharge line to ensure uniform acid agitation inside the bath.

Jothi Ramalingam
Abhinava Aluminium P Ltd - Chennai
2002


We used air from a regenerative blower thru a sparger system. We later added a filtration system (which contributes a small amount of agitation)that allowed us to use the bath longer and have less rejects. I suggest both rather than just one.

James Watts
- Navarre, Florida
2002



2003

Hi Abhikit,

What James Watt says makes sense. A simple system. Use plastic pipe, i.e, PVC ... the layout, i.e., headers and laterals, will depend upon the tank length and width.

To start with use 1/8" dia holes (smaller ones tend to plug up during drilling) at say 12" centers ... and if you find, for instance, that the 'end' or 'ends' are not getting sufficient agitation and air bubbling, drill one slightly larger hole at the very end to relieve the pressure and get better distribution. ... you could take a bleed-off from your air compressor but then use a valve (diaphragm or needle) to control/reduce the flow.

For superlative mixing, go to the archives # 9111 & 7718.

freeman newton portrait
Freeman Newton [deceased]
(It is our sad duty to advise that Freeman passed away
April 21, 2012. R.I.P. old friend).





(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:

 
Jobshops
Capital
Equipment
Chemicals &
Consumables
Consult'g, Train'g
& Software


About/Contact  -  Privacy Policy  -  ©1995-2024 finishing.com, Pine Beach, New Jersey, USA  -  about "affil links"