×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Annodized Al Ally

Annodized Al Ally

Annodized Al Ally

(OP)
Anyone have any idea what color that Al Ally Would be if Annodized Type 2 Class 2, I believe that the Ally is 2024.

RE: Annodized Al Ally

(OP)
Thanks Steve,

I guess I left out the most important part: "Clear / No Dye" There is a small arguement going on in here that it the type 2 class 2 greys the metal. Is that true?

RE: Annodized Al Ally

wes616

I seem to recall that this finish would tend to have a light mottled gray coloration with a "semi-gloss" to "flat" luster... depending whether it was hot-water sealed, or not.

Also... At an angle, and/or with polarized light (including sunlight) the appearance may also have a slight holographic translucence.

Regards, Wil Taylor

RE: Annodized Al Ally

According to MIL-A-8625:
Type II is sulfuric acid anodizing, conventional coating produced from sulfuric acid bath.
Class II is dyed
I would take this to mean you can not have "Non-Dyed" and still be class II.
Class I is non-dyed.
It goes on to say on class I that any coloration resulting from anodic treatment with various alloy compositions shall not be considered coloration. The charistic color imparted by the sealing process shall also be considered non-dyed.
I believe this spec goes on to describe quality inspection of parts.

RE: Annodized Al Ally

Fieldteam...

Your assessment is correct.. Wes616 is actually describing non-dyed sulfuric acid anodized coating per MIL-A-8625 Type II Class 1.

Regards, Wil Taylor

RE: Annodized Al Ally

(OP)
Thanks for your help guys. I guess that this material finnish decision has been passed onto manufaturing (cost)and industrial design (asthetic) now. We in engineering gave a recomendation, but now it is out of our hands. Someone else was working on that and I'm not sure what the solution is. Will let you know if I find out.

Thanks for your help though.

RE: Annodized Al Ally

Final coloration/light properties on clear anodize all depends on your metal finish prior to anodizing.  You can run the spectrum all the way from silver frost to a "yucky" mottling that will mimic galvanizing.  

RE: Annodized Al Ally


"...and I'm not sure what the solution is..."  No pun intended?

Steven Fahey, CET

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources