Black anodize issue: pitting and salt-like substance
May 22, 2017
Q. We have been running these parts for customers for a while now. They seem to come out with a salt like substance on the parts. When we wipe the parts down, there is pitting, or it wipes the finish away. I was just wondering if anyone knew what was causing this and if they had an idea for a solution or what steps we could take to correct the issue.
- vonore Tennessee usa
^- Privately contact this inquirer -^
May 22, 2017
A. I have some ideas but first I need to know (1) alloy, (2) is there a nitric post dip, (3) racked on titanium or aluminum - then I can answer.
Robert H Probert
Robert H Probert Technical Services
Garner, North Carolina
Editor's note: Mr. Probert is the author of Aluminum How-To / Aluminio El Como
May 23, 2017
A. Hi Casey,
Aerospace - Perpetually sunny rock in the Irish Sea
A. I want to ask a most important question for problem's diagnosis:
Does it occur only with these profiles or all black anodized profiles? If you say "only these profiles", I can say some remarks as prediction:
1- check your alloy
2- poor or inadequate rinsing (especially after anodizing) or sealing
3- change racking position
4- check anodizing coating thickness. It must be 10 micron and over (15 preferably).
- TURKEY, sakarya
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