The effect of profiled surfaces on the calibration of dry film thickness gauges is well documented. There are several methods given for dealing with the increase in apparent coating thickness caused by the roughness of a surface, for example, the blast profile achieved by abrasive blast cleaning of a steel surface. These are described in the ASTM(1) standard practice D7091, ISO(2) 2808 and ISO 19840.

A novel test method has been developed specifically for measurement of dry film thickness on abrasive blast surfaces where the gauge has been pre-calibrated for the three levels of blast profile commonly encountered.

This paper will discuss the operation of this new gauge and the advantages that this approach offers to structural steel and marine coating applications in particular. Field trials will be described and the benefits and limitations will be discussed.

Subject
Coating inspection, Steel surfaces, Coatings, Substrates, Laboratory data, Probes, Gauges, Calibration, Thickness measurement, Instrumentation, Substrate surfaces, Coating thickness, Surface profile
Keywords:
coating thickness, profiled surfaces, adjustment and verification, marine coatings
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2015
Association for Materials Protection and Performance (AMPP)
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