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

-----

Pitting in bright silver anodizing

2006

I am inquiring about bright silver anodizing on aluminum extrusions
We have had problems with bad pitting on the aluminum, we bring the metal in from china and have had that blamed but when we push the anodizer it gets done properly.
can you tell me why this happens.

Jeffrey James Stokes

Suspect chloride contamination in the line. Look for it in the deox, anodizing solution, and seal. IF the parts are racked on titanium and the seal tank is stainless steel, the galvanic current aggravates pitting, then in the presence the chloride pitting will be worse.

Robert H Probert
Robert H Probert Technical Services

Garner, North Carolina

2006

(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: