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

Anodize Specification

Anodize Specification

Anodize Specification

I have a Dassault Aviation general specification that references BF4/BF5 anodizing treatment.  I've never heard of this.  Its not mentioned in MIL-A-8625 and web searches are not giving me any information.
Has anyone encountered this?
Does this have a MIL-A-8625 equivalent?

RE: Anodize Specification

As Dassault is a French company, it may be a type of anodizing defined within the French spec. NF A-91-450 (Décembre 1981) Traitement de surface des Métaux – Anodisation de l’alu et de ses alliages. Spécifications générales.
[“Anodizing of aluminum and its alloys – general specifications for anodic oxide coatings on aluminum.”]

Maybe contact Dassault http://www.dassault-aviation.fr/index_gb.htm directly
or the European Anodizing Association (EURAS) [I cannot locate, it may have morphed into the  Association for European Surface Treatment on Aluminium , but the link I found http://www.estal.ch/ seems dead].

If I had to guess, judging from the age of the spec. and its aircraft use, it might be chromic acid anodizing (MIL-A-8625F Type I, IB or IC) http://www.anodizing.org/reference_guide.html

However, a wrong guess could be very expensive so here are some other places to try:
The European Aluminium Association http://www.aluminium.org/extra/about/abouteaa.asp
Pechiney Aluminium
Their anodized aluminum sales manager (for export) is
 Marc Jobert
 Sales manager - Export
 33 04 76 97 21 00
 33 04 76 97 21 05

RE: Anodize Specification

The Association for European Surface Treatment on Aluminium is at http://www.estal.org/
However, their website only mentions sulfuric acid anodizing and painting as finishes for aluminum, not chromic acid anodizing.

RE: Anodize Specification

The French anodizing specification AFNOR NF A91-450 is available for $46US (hard copy, 11 pages) from Global Engineering:

RE: Anodize Specification


BF4 and BF5 are both oxalo-chromic anodisation operations (with slighly varying compositions and bath temperatures) They are described in Dassault spec. CR Four further companies in France are approved by Dassault for this process, aside from the first link IRstuff provided you.

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


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

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