Home /
T.O.C.
FAQs
 
Good
Books
Ref.
Libr.
Advertise
Here
Help
Wanted
Current
Q&A's
Search 🔍
the Site

Problem? Solution? Chime right in!
(perhaps the world's last 'no registration' site)

-----

"Runs streaks in type III black dye"



60302
October 20, 2016

Q. We recently developed an issue were we are getting "runs" under our black dye type iii. Was wondering if anyone could pinpoint the issue -- containments somewhere along the line, inadequate prep work or something completely different? This is 6061-T6 being bright dipped, then type III coated with black dye.

Chris Jones
product design & manufacture - Coopersburg, Pennsylvania
^


October 26, 2016

A. Chris

The blemish looks to be the result of inadequate rinsing after anodize and before dyeing. To confirm, observe the blemish before unracking. Residual acid from the anodize is heavier than the dye solution, and will run down from the origin.

If this is the case, options include better rinsing (longer, agitated, cleaner), a mild nitric acid dip, and an inspection 1 - 2 minutes after immersion into the dye solution; while the parts are not yet black, the blemish will usually be visible. If found, repeat the two previous options and dye again.

A poor man's fix would be to moderately agitate the parts for the first 1 - 2 minutes of the dye immersion to 'rinse' away the acid.

Willie Alexander
- Green Mountain Falls, Colorado
^


October 26, 2016

thumbs up signThank you for all of your help! We will give this a go, makes total sense.

Chris Jones [returning]
- Coopersburg, Pennsylvania, USA
^


July 27, 2017

Q. Chris, we're having a similar issue. Did the better anodize rinse help?

Thanks

Jessie Moser
- toano, Virginia, USA
^


July 27, 2017

A. Yes, better rinsing was our solution, Thanks.

Chris Jones [returning]
- coopersburg, Pennsylvania
^

none
finishing.com is made possible by ...
this text gets replaced with bannerText
spacer gets replaced with bannerImages

Q, A, or Comment on THIS thread SEARCH for Threads about ... My Topic Not Found: Start 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:

 
Jobshops
Capital
Equipment
Chemicals &
Consumables
Consult'g, Train'g
& Software


About/Contact    -    Privacy Policy    -    ©1995-2021 finishing.com, Pine Beach, New Jersey, USA