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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

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