×
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

Pre treatment options for Aluminum Alloys

Pre treatment options for Aluminum Alloys

Pre treatment options for Aluminum Alloys

(OP)
Hi all,

     I was curious as to what the suggested pre-treatment options are for Al Alloys prior to powdercoating? We primarily use 6061-T6/T6511 and 5052-H32, and I currently am calling out a 5 stage Iron Phosphate pre-treatment but upon doing some research I am seeing a lot along the lines of a Chromate conversion coating. What are the pros and cons of both? I assume Hexavalent Chromium would be more expensive due to the toxic issues with it, but I also see non-Hexavalent containing Chromate conversions; what does this entail? these parts are for structural members of vacuum systems, and while they aren't going to be seeing a constant salt spray or anything they do have the potential to be operated outside for the majority of its use near marine environments.

RE: Pre treatment options for Aluminum Alloys

The Powder Coating Institute lists several pre-treatment options: Chrome phosphate, Hexavalent chromate, Trivalent chromate and some titanium and zirconium chemistry with a polymer. To get better direction for your application, contact one of the treatment chemistry suppliers such as Henkel.

RE: Pre treatment options for Aluminum Alloys

You should use a hexavalent chromium free pretreatment.  Some options include Alodine from Henkel, Iridite from MacDermid, and Gardobond and Oxsilan from Chemetall.

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