netneut
finishing.com -- The Home Page of the Finishing Industry
A website for Serious Education, promoting Aloha,
& the most FUN smiley you can have in metal finishing


Finishing.com has been free for 22 years,
but without net neutrality we could soon
cease to exist. Do us a solid, click on
the banner, and contact congress today!
HomeFAQsBooksHelpWantedAdvertiseForum
topic 7796

Joint Bath for Type II and Type III Al Anodizing


(2001)

A colleague who is limited by space considerations is interested in using the same anodizing bath (obviously changing the temperature and voltage) for both Type II and Type III anodizing as per MIL-A-6625.

Does anyone have practical experience with such a practice and can anyone comment on bath formulations which would enable such as dual-purpose bath?

Aryeh Asher
- Ashkelon, Israel


First of three simultaneous responses (2001)

I may be disagreed with on this one.. but I think you would be just fine operating at around 190 gr/litre..and just switching your temp from 40f to 72f (and, as you mentioned.. changing your current densities).

The only bummer about this is the down time between temp changes. I really prefer 2 tanks, myself. There are additives you can purchase that allow you to "hardcoat" at higher temps, to reduce downtime, and cooling costs.. but I believe studies have shown that the coating is not as hard as those done at the lower temps.

Marc Green
Marc Green
anodizer - Boise, Idaho


Second of three simultaneous responses (2001)

My company has done this for 40 years. We have 2 anodizing tanks.

One of them is used for both hardcoat Ty III & regular Ty II anodizing. This is not a problem.

Anodize Ty II loads are run at 70 - 74 deg f at 12-15 amps/ft sq, while hardcoat loads are run at a lower temp at 30 - 36 amps / ft sq.

David A. Kraft
- Long Island City, New York


Three of three simultaneous responses (2001)

There are baths that do both. Try Clariant Corporation. They have an additive called Anadal EE that allows hardcoating in a mid temperature (50D) bath. I believe that it will also produce thinner coatings at the same temperature, or maybe a little higher. In the trade this is referred to as Type II1/2 anodizing.

Good luck.

Pete Faxon
- Oxnard, California



This public forum has 60,000 threads. If you have a question in mind which seems off topic to this thread, you might prefer to Search the Site

ADD a Q or A to THIS thread START a NEW THREADView This Week's HOT TOPICS

Disclaimer: It's not possible to 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 may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental ComplianceTesting Svcs. & Devices


©1995-2017 finishing.com     -    Privacy Policy
How Google uses data when you visit this site.