|Ask the Experts|
March 30, 2021
Adhesion Problems with Conformal Coating
We have a large RF back plane that is gold plated on the operational side. We are having intermittent adhesion issues with the conformal coating. Our vendor wants us to change to a new coating.
We are being told that in general conformal coating has a very difficult time adhering to gold surfaces. And the cracks or lifting in the coating is caused by stress in the back plane where it is fastened to the card guides.
What can we do to eliminate the adhesion problem?
|Expert Panel Responses|
Goingto a Silicone based conformal coating could help with the cracking. As far as adhesion goes, making sure the surface is very, very clean is critical, as well as making sure the material you are using isn't expired, or mixed incorrectly.Is it possible to conformal coat it after the card guides are on? That may help as well.
Esterline Interface Technologies
To address the issue with the conformal coating adhering to large gold surfaces we would suggest using a plasma surface treatment to roughen up the surface to improve the bonding energy.
President/Senior Technical Consultant
For your review and consideration:
Plasma Treatment Improves Conformal Coating Adhesion from Nordson March
Circuit Connect, Inc.
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