×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

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!

*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

Anodising 2014A and 7075

Anodising 2014A and 7075

Anodising 2014A and 7075

(OP)
Can anyone help clear up some confusion I have over the suitability of 2014 T6 and 7075 T6 for anodising.

I have heard that 7075 T6 can become brittle and therefore fatigue performance is reduced when anodised or hard anodised. Conversely when browsing anodisers web sites I have noticed that 7075 is the preferred material for anodising or hard anodising as 2014 and other alloys with high copper content are succeptible to burning. The standard procedure where I work now is to avoid anodising of 7075 where used in high fatigue situations.

Can anyone help resolve my confusion?

RE: Anodising 2014A and 7075

The copper content of the 2014A or any aluminium alloy will result in an anodised that will not resist corrosion and may actually encourage corrosion as the copper selectively etched away in the anodising bath.

RE: Anodising 2014A and 7075

The anodizing process produces a hard, brittle ceramic oxide layer (Al2O3) on the surface of an aluminum alloy.  Under fatigue loading conditions, cracks initiate in this brittle layer, and then propagate through the base aluminum.  This is why the fatigue strength is reduced.

The difference in anodizing performance among the various aluminum alloys has to do with the exact chemical composition, with copper-containing (2XXX series) alloys being noticeably worse, as AlanD explained.

RE: Anodising 2014A and 7075

(OP)
THANKYOU BOTH

I UNDERSTAND THAT 2XXX ALLOYS DO NOT ANODISE AS WELL AS 7075 BUT IS IT TRUE THEN THAT 7075 FATIGUE PERFORMANCE IS REDUCED MORE THAN SAY 2014 AFTER ANODISING, OR WOULD THE REDUCTION BE THE SAME??

RE: Anodising 2014A and 7075

The reduction in fatigue strength would essentially be the same.

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! Already a Member? Login



News


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close