Aloha, fun & authoritative answers -- no cost, no registration, no passwords, no popups
(as an eBay Partner & Amazon Affiliate we earn from qualifying purchases)

Home /
T.O.C.
Fun
FAQs
Good
Books
Ref.
Libr.
Adver-
tise
Help
Wanted
Current
Q&A's
Site 🔍
Search
pub  Where the
world gathers for metal finishing
Q&As since 1989



-----

Complete loss of coloring on anodized(?) aluminum hinge



 

We purchase an aluminum butt hinge for one of our windows that we believe to be anodized (dark bronze color). In the Phoenix area, we have encountered some hinges in the field where one side of the hinge completely lost its coloring, but the mating part was unaffected. The hinges are exposed to the exterior of the house and most probably were in direct UV exposure. Is this possible on an anodized aluminum part? What could be the cause for this? We examined the part and it is most probably not a painted extrusion (we did a scratch test). There is no flaking of finish anywhere on the part. The back (unexposed) side of the hinge looked as if the color was beginning to fade. The windows themselves are anodized aluminum (6063 alloy) and we have never experienced this color loss with the window extrusions.

Tony Kubik
- Tacoma, Washington



Some dyes are organic and not particularly resistant to fading in sunlight, whereas others are inorganic. But if a dye is not properly sealed it won't last long, and that's what it sounds like.

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


Assuming the parts were, indeed, anodized.. its a pretty easy one to answer..they weren't sealed properly. One other possibility is that the dye the coater was using had a very poor light-fastness rating.

Marc Green
Marc Green
anodizer - Boise, Idaho
 



(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"