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topic 585

How to quantify amount of scratching on surface


(1996)

I have a small coated surface (1/4" x 3/4") that has scratches on it. I would like to quantify the amount of scratched area in some square units.

Is there instrumentation (mechanical or optical that can do that for me. The scratches are of varying length and widths.

The surface scratched is blue with the scratched area being a white substrate.So there is a high color differentiation.

Michael B [last name deleted for privacy by Editor]
Eli Lilly and Co.


(1996)

Michael,

There is image analysis software out there that we're sure will do what you're after. We have it and use it in conjunction with our Scanning Electron Microscope and have great success, but the SEM uses a technique that may not show your scratches so you need to use the imaging software with an optical image. We use the Image Tool product and quantify pitted areas, inclusions and other surface phenomena, but unless the exposed surface is materially different from the top layer, the SEM won't see it.

Bob Denney
avionics Tampa, Florida


Profilometer

December 2, 2008

Hi, Michael. The usual instrument for surface roughness measurement is a profilometer, and it may turn out to be the thing you need for this. That opens the question of picking an appropriate scale then. There is a scale that platers sometimes use, called Rmax, which you might investigate, beginning with letter 20490. Good luck

Regards,

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey



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