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



-----

WHITE SPOTS ON T4 ANODISING




WE HAVE BEEN ANODISING EXTRUDED T4 6261 HARD ALLY FOR AROUND A YEAR NOW. RECENTLY WE HAVE BEEN HAVING SOME PROBLEMS WITH THEM THOUGH. THESE ARE FRAMES FOR A CHAIR, AS SHOWN, IF THAT HELPS AT ALL. WE HAVE BEEN GETTING WHITE SPOTS AROUND DRAIN HOLES, AND A VERY STICKY SOLUTION AS WELL. HERE ARE THE FACTS ON THE MATERIAL USED.

15033

T4 6261 HARD ALLOY, HEAT TREATED POST BENDING TO T6. 32 GRADE HYDRAULIC MINERAL OIL IS USED FOR BENDING AND WIPED CLEAN WITH turpentine [on eBay or Amazon] .

THESE ARE FIRST DEGREASED IN P3 ALMECO, ETCHED IN A P3 ETCH, DEOXIDIZED IN P3 ALMECO 90, ANODISED IN sulfurIC AND OXALIC ACID, AND SEALED IN ANOSEAL 30C. ALL CHEMICALS SUPPLIED BY HENKEL.

ANY COMMENTS OR QUESTIONS ARE MORE THAN WELCOMED.

ANDREW FALCONER
- CHRISTCHURCH, NEW ZEALAND
2002



For the benefit of my clients I have just made a two page list of causes of "White Spots", and uploaded it into the Library section of finishing.com's web site. You mentioned the oxalate additive, well, Calcium Oxalate is a white powder. Get back to me, or any one else out there, with any other questions on "White Spots".

robert probert
Robert H Probert
Robert H Probert Technical Services
supporting advertiser
Garner, North Carolina
probertbanner
2002




(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"