We had one customer with a circuit board that required plasma cleaning
prior to coating every single time. It does wonders to cause it to
"wet-out" It was a result of the surface tension of the coating being much
higher then the surface energy of the substrate. The plasma treatment
increased the surface energy until it surpassed that of the liquid. We had
a different coating that worked fine but you know how it goes, "it wasn't
spec'd that way"

As for the vacuum oven, I have never tested how much it altered surface
energy or in what direction.

Lloyd Duso
Diamond-MT
Plant Manager
(814) 535-3505
www.Diamond-mt.com


On Thu, Aug 28, 2014 at 11:17 AM, Ioan TEMPEA <
[log in to unmask]> wrote:

> Dear Technos,
>
> Talking about the surface energy as a property of a surface that will get
> conformal coated, for instance, (as opposed to the surface tension which
> belongs to the coating material).
>
> From what I've read vacuum bakeout will reduce this surface energy and
> plasma cleaning will increase it. Where can I get academia on the physics
> of the surface energy (where it comes from, why plasma cleaning and vacuum
> bakeout affect it, etc.)?
>
> Thanks,
>
> Ioan Tempea, P. Eng.
> Manufacturing Engineer
> Satellite Systems
> MDA
> 21025 TransCanada Highway
> Ste-Anne-de-Bellevue, Qc, Canada H9X 3R2
> Tel: +1-514-457-2150-3556
> www.mdacorporation.com<http://www.mdacorporation.com>
>
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