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



-----

Blisters found on sulfuric Acid Anodizing Parts




August 16, 2013

Q. We are facing some problem in sulfuric acid anodizing 2024 and 6061 AL materials using MIL-A-8625 Type II recently.

Our part is 1.7 m in diameter with 4 jigging points. We revealed some blisters on the surface after sealing process as per attached pictures:

blisters on sulfuric acid anodize-1 blisters on sulfuric acid anodize-2

Those un-anodized blisters seem to be more than 0.002" deep and can't cover by anodizing. They usually happen 45 deg away from the jigging points but not necessarily the same area at all times, and it appeared on opposite side as well. In addition, those small blisters only appeared on the horizontal and top surfaces of the part but it never appeared on the vertical or bottom surfaces ever.

We need valuable advise on this issue since we found no problem with the materials and also we have tried changing the new chemical but it still appeared. Thank you.

Han Lin Yap
Operation - Baya Lepas, Penang, Malaysia



(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"