No passwords, no registration, no paywalls, no popups, no AI

As an Amazon Associate & eBay Partner we earn from affil links

finishing.com -- The Home Page of the Finishing Industry

Search our quarter-million Q&As

Home of the finishing HOTLINE since 1989

-----

Facing black marks from grinding anodized aluminium

Q. I'm from India. I'm doing Anodizing for last 20 years. I'm facing problems grinding: black marks on aluminium after Anodizing and colour.

61127-1

Please help.

Pooran Singh
- Faridabad Haryana India
June 19, 2020

A. Looks like imbedded foreign matter from the media used in pre-treatment. Media, such as sanding paper, must be designated "for aluminum only", otherwise we imbed other metallic particles into the soft Kleenex-like spongy aluminum.

Robert H Probert
Robert H Probert Technical Services

Garner, North Carolina

June 23, 2020

finishing.com is made possible by ...
this text gets replaced with bannerText

Sorry! Finishing.com is temporarily Read-Only.
Ted Mooney is retiring but I have several offers to take it over.
We're working hard to make sure we find it the best new home.

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: