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topic 33552

Need to measure chrome thickness on stainless


(2004)

We are a manufacturer of Coal Prep Dryers, using industrial chrome to improve the service life of our components. I need a non-destructive method to measure the depth of industrial hard chrome on 304 stainless. I have been informed that here is no way to do this. Magnetic and eddy current methods will not work, but surely someone has developed a cost effective way to do this. Any advice would be welcomed.

Thanks......

Jeremy Allen
Coal Dryer Manufacturer - Raleigh, IL, U.S.


(2005)

X Ray flourescence will do the job.

jeffrey holmes
Jeffrey Holmes, CEF
Spartanburg,
      South Carolina



(2005)

Hi

XRF probably won't work. Stainless is 10+% Chromium. The thickness measurement will be off because of this, maybe not by much, but it will affect the measurement. You could probably use FIB (focused ion beam) and SEM (scanning electron microscope), but your part would have to be cross-sectioned for that.

Jeff Marten
- Colorado Springs, Colorado, USA


(2005)

All that needs to be done is to calibrate using chrome on stainless standards.

jeffrey holmes
Jeffrey Holmes, CEF
Spartanburg,
      South Carolina


(2005)

Jeff, industrial hard chromium plating is about 2 mils, or 50 microns, thick. I was under the impression that such would be too thick to get an x-ray fluorescence beam through: is that not the case?

lee gearhart
Lee Gearhart
metallurgist



(2005)

Lee: Where does it say that hard chrome is .002" think? We plate hard chrome anywhere from .0001" to .060" I don't know what the absolute limit for XRF is, but it will certainly measure coatings .002"+.

jeffrey holmes
Jeffrey Holmes, CEF
Spartanburg,
      South Carolina


(2005)

I have an older EDXRF (Fischerscope 1510) and the limit for Chrome is 360u", or 0.36 mils. Maybe a WDXRF would work? I don't know a whole lot about WDXRF machines, but don't they use a flat vacuum-assist sample tray? If so would the sample need to be flat?

Jeff Marten
- Colorado Springs, Colorado, USA



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