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

-----

Streaky anodizing

What is the best grade of aluminum (1050/sic or 5251/ns4) to clear anodize? At the moment we have a panel that is grained horizontally, after it has been anodized we are getting a streaky effect vertically. Does anyone have any ideas why this is happening ?

RICHARD LOVATT
SHEETMETAL FABRICATION - STEVENAGE, HERTFORDSHIRE, U.K.
2004

Assuming that "grained" means sanded or blasted, you have probably imbedded iron and/or other junk into the surface. Etch longer at a lower temperature, transfer faster, deoxidize longer, and let us know.

Robert H Probert
Robert H Probert Technical Services

Garner, North Carolina

2004

(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: