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

Where the
world gathers for metal finishing
Q&As since 1989

-----

Black anodized aluminum discoloration at high temperatures

May 2, 2008

We had some black anodized alumnimum parts that we need to expose at 200 °C for 3 days. We need them to remain black.
We have obeserved different grades of discoloration on the parts from parts that do not discolor at all up to light golden yellow.
Is there a solution for it?

48675

Lourdes Rojas
industrialist - Mississauga, Ontario, Canada

Organic dye cannot withstand those high temperatures. You must use special alloy metal and one of the "architechtural" processes from Alcoa, Reynolds, or Kaiser.

Robert H Probert
Robert H Probert Technical Services

Garner, North Carolina

May 5, 2008

(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: