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What Are The Factors That Affect The Measurement Of The Coating Thickness Gauge?
Oct 19, 2018

What are the factors that affect the measurement of the coating thickness gauge?


Let's take a look at the factors that affect the measurement of the coating thickness gauge.


Magnetic field


The strong magnetic field generated by various electrical equipment around it will seriously interfere with the magnetic method of thickness measurement.


2. Deformation of the test piece


The probes deform the soft cover specimens, so reliable data is measured on these specimens.


3. Base metal thickness


Each instrument has a critical thickness of the base metal. Above this thickness, the measurement is not affected by the thickness of the base metal.


4. Edge effect


This instrument is sensitive to the steepness of the surface shape of the test piece. Therefore, it is unreliable to measure near the edge of the test piece or at the inner corner.


5. Matrix metal electrical properties


The conductivity of the base metal has an effect on the measurement, and the electrical conductivity of the base metal is related to its material composition and heat treatment method. The instrument is calibrated using a standard piece that has the same properties as the test piece base metal.


6. Base metal magnetic properties


The magnetic thickness measurement is affected by the magnetic properties of the base metal (in practical applications, the change in the magnetic properties of the low carbon steel can be considered to be slight). In order to avoid the influence of heat treatment and cold working factors, the same properties as the base metal of the test piece should be used. The standard piece calibrates the instrument; it can also be calibrated with the test piece to be coated.


7. Curvature


The curvature of the specimen has an effect on the measurement. This effect always increases significantly as the radius of curvature decreases. Therefore, measurement on the surface of the curved test piece is not reliable.


8. Surface roughness


The surface roughness of the base metal and the cover layer has an effect on the measurement. The roughness is increased and the influence is increased. Rough surfaces can cause systematic and accidental errors, and the number of measurements should be increased at different locations for each measurement to overcome this accidental error. If the base metal is rough, it is necessary to check the zero point of the instrument on the base metal test piece with similar uncoated roughness. Or dissolve the cover layer with a solution that does not corrode the base metal, and then proofread the instrument. Zero point.