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ISO 2409 / ASTM D3359 Paint Adhesion

T

TommmD

#1
We procure a molded front panel bezel with interior surfaces painted a copper / silver shielding paint, for EMI suppression.

We use the ASTM D3359 cross hatch test for paint adhesion testing.

While the part passes the cross hatch test with flying colors ( no jagged delamination, no squares pulled off), nothing I can find addresses the topic of overspray. That same test pulls of particles galore and the tape is copper colored. But nothing delaminates, there is no paint to substrate failure.

This is a cohesion failure but I cannot find a specific reference to it. What am I missing? This is a significant failure for us since the particles can find their way into fine pitch components & short ( ask me how I know...).

ty in advance, Tom
 
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gpainter

Quite Involved in Discussions
#3
Not familiar with your process but overspray can usually be corrected with operator training and fluid/air pressure standardization, gun selection. Check the booth and make sure you have the pull.
 
T

TommmD

#4
Training is fine, but I need a test that the vendor can use prior to shipping.
I get samples in that look great & orders that look awful. It gets expensive going back & forth to say nothing of delays. The whole purpose for standards is to avoid this by testing up front.
 

gpainter

Quite Involved in Discussions
#5
Sounds like you answered your question. They are probably running samples on another line and when the go to regular production you get the overspray. Usually you can see and feel overspray. I believe if they fix their process you will not have to test or worry. Might be well worth it to visit their site when they are running your product.
 

gpainter

Quite Involved in Discussions
#7
You might try:
ASTM D7868-13
This practice covers a procedure for qualitatively evaluating the dry fall properties of coatings. The establishment of the test environment and the evaluation procedures are described
 
T

TommmD

#8
I have been overwhelmed by the absence of response on this issue not only on this forum but at finishing.com and from discussions with finishing professionals and companies. Not that people haven't tried to help, but that there does not appear to be a valid cohesion spec.

Since this is not a theoretical exercise, what we have done is to use tape pull testing per D3359 and examining the tape for particle residue. What most people would try.

We compared tape pull results from the D3359 kit minus the cross-hatch against desk-top 3M Scotch brand tape & clear packing tape. What we found was that despite the differences in adhesive aggressiveness, the results were uniform. If one tape pulled particles off, all did, & conversely if one was clear, all were clear.

We applied the tape particle side up to white paper & visually inspected it without magnification. Since the paint we are testing is copper colored, this provided good contrast. I have also done this on a black background with equally visible results. To preserve the specimens we covered them all with clear packing tape. They photograph & scan very well for electronic record-keeping & transmission for review with the supplier.

I would love to hear from other people's experience; I share this to try to keep this thread open & to develop the topic since it appears to be a gap that needs a plug.
 

harry

Super Moderator
#9
.................. That same test pulls of particles galore and the tape is copper colored. But nothing delaminates, there is no paint to substrate failure. ...................
I spoke to someone in R&D of the coating industry. I was told that for them, this is considered as adhesion failure. I was told that there is provision in the standard for different degree of failure but she couldn't remember off hand if it is D3359.

Her advice is to go back to the manufacturer - it could be insufficient binding power, pvc (pigment volume concentration) too high or particle size too large or any of many other possibilities and they may have to tweak the formulation a bit.
 
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