No passwords, No popups, No cost, No AI:
we earn from 'affiliate link' purchases, making the site possible

Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ

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

  The authoritative public forum
  for Metal Finishing since 1989

-----

Anodize Dye Problem

What would cause the color/dye of a Type II anodized part appear to be mottled or inconsistent on a part surface. This apppearance is random but usually on the corners or radii of a given part.

Alan B. Pirnat
- Willoughby, Ohio

Mottled usually means incomplete removal of organic soil (cleaning). You mentioned high current density areas, so that could be burning or just barely too much current to get the same pore structure in the high current density areas. A proprietary glycolic type additive might help. Also if the dissolved aluminum is high it will clog the pores more in the highs than in the lows and thus contribute to dye inconsistency.

Come back to me with dye temperature, aluminum alloy, dissolved aluminum, and let's brain storm some more!

Take two aspirin and call me in the morning.

Robert H Probert
Robert H Probert Technical Services

Garner, North Carolina

(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: