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

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

-----

Embedded Aluminum that does not Anodize

Our company has an automated sulfuric anodizing line that we primarily do hard coating of 3003 aluminum. The last few months we have been seeing an increase in a "white scratch" appearance in the aluminum after anodizing. As far as we can tell it's embedded aluminum from the mill. We did some research and we were told that since more and more companies are forced to be "Green Friendly" that lubes and coolants that are used in the mills doesn't have the same quality as the old traditional lubes. Thus causing the aluminum to stick to the rollers and get embedded into the aluminum sheet. The only way we have found to remove this is to anodize, strip and re-anodizing. We have tried longer etch and desmut times and even a quick anodize and strip. Anyone else seeing this same issue or have any ideas

Scott Frazier
Anodizing - Spoakne Valley, Washington, USA
March 10, 2011

(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: