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topic 12111

Iron-Phosphate thickness check


We need to check the thickness of zinc-iron phosphate coatings on parts we receive from suppliers. The parts are too heavy to weigh on an analytical balance, in any case we are more interested in checking thickness than coating weight. Our spec for thickness is 15-30 microns. Any suggestions?

Bill Martin
- Decatur, Illinois, USA


The industry accepted method is weight, not thickness. Thickness will vary depending on the type of steel. Have your phosphater run test panels (3"x 10" or smaller) same time as the parts. A lab can find the weight per sq. inch. If you REALLY need to check thickness, maybe a lab with an x-ray fluoresence machine could do thickness. I am sure this method would cost a whole lot more.

Bill Hemp
tech svc. w/ chemical supplier - Grand Rapids, Michigan

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