×
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

Protective Coating

Protective Coating

Protective Coating

(OP)
I need to determine the protective coating that is required by FAA or CAA, for aluminium parts located in aircraft interiors. Maybe Ali-Chrome coating or special yellow anodise??? Thanks for your answers.

Highest Regards,
Roozle

RE: Protective Coating

roozle..

I have never heard of the materials You indicated.  

The FAA does NOT specify corrosion protection as You were expecting: it is part of the damage protection scheme for structures and systems... and interiors MUST not contribute to structural or systems corrosion. This includes metallic protection schemes and use of non-corrosive non-metallic materials and other chemicals materials [such as fire-proofing impregnants].  These materials must NOT out-gas, cross-link or otherwise transfer corrosive chemistry [clorine, salts, etc]; or otherwise don't encourage corrosive behavior, such as trapping moisture against metal parts [IE: moisture-proof insulation].

Typically "Alodine" [AMS-C-5541] and Epoxy Primer [MIL-PRF-23377, or variations of this primer] are used for aluminum protection.

All non-metallic materials have to be checked for moisture retention, out-gas constiuents, contact chemistry [IE: materials touching sometime cross-link, like rubberbands against certain paints], abrasiveness, fire resistance... etc. This includes "new" and aged" versions of the same materials.

Regards, Wil Taylor

RE: Protective Coating

Yellow is probably a chem-film.

TTFN

RE: Protective Coating

(OP)
Yes the surface treatment is yellow. Do you have any more infomation regarding this.

Rgs,
Roozle......

Highest Regards,
Roozle

RE: Protective Coating

roozle...

It's hard at best, impossible at worst, to diagnose coating-systems without hands-on inspections.

The surface is "yellow" could mean a host of things, based on Your perspective.

a.  If this is an aluminum surface that appears to "shimmer" with a "golden-yellow" reflection-tone, it could be alodined or chromic acid anodized... or possibly phosphoric-acid anodized if viewed at an angle.

b.  If this is a painted coating it could be an epoxy,  polyurethane or enamel primer [in that order] with yellow corrosion-protective pigments... or if the assy is adhesive-bonded, it could be an adhesion promoting epoxy primer.

It could also have a + b on it.

More specific deatails are important.

Regards, Wil Taylor

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