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!

*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.

Jobs

life of applied primer coat (MIL-23377) when being exposed to environement and sunshine

life of applied primer coat (MIL-23377) when being exposed to environement and sunshine

life of applied primer coat (MIL-23377) when being exposed to environement and sunshine

(OP)
we have an aircraft that is to be preserved for some time in future. it was depainted for inspection. It has presently been primed with MIL-23377 primer.

the aircraft will remain exposed to UVs and sunshine alongwith rest of environmental factors. i do know that a top coat will endure around 4 years ((in case of parked outside) and 8 years (in case of parked inside)as indicated in USAF TO 1-1-8.

what life can we expect this coat to be of, while in open and in shade?

thanks in advance.

RE: life of applied primer coat (MIL-23377) when being exposed to environement and sunshine

MIL-PRF-23377 primer is epoxy-based, which has poor resistance to ultraviolet radiation. You can expect this coating to chalk, degrade and fail within 2 to 3 years when exposed to full sunlight, maybe less depending on the coating quality and the sunlight characteristics.

RE: life of applied primer coat (MIL-23377) when being exposed to environement and sunshine

(OP)
thanks CoryPad....

RE: life of applied primer coat (MIL-23377) when being exposed to environement and sunshine

Wouldn't the thickness of primer coating have an affect on the corrosion protection it provides over time? Normally, primers are designed for best adhesion and minimum film thickness. But this does not mean a thicker coating of primer could not be applied for use as a preservative. As noted, primers do not typically have the additives that topcoats do for UV resistance, etc. But as long as the primer coat prevents penetration of moisture onto the metal structure, it is performing its job, right?

RE: life of applied primer coat (MIL-23377) when being exposed to environement and sunshine

Terry,

Yes, higher thickness usually improves corrosion protection over time. But that seems to be secondary to the issue here regarding epoxy-based coating exposed to ultraviolet radiation. The coating will be damaged and not prevent moisture penetration.

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


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