Abstract
The high-voltage spark testing method for protective dielectric coatings is applied in almost all manufacturing areas and is governed by ISO, ASTM etc. However, they do not take into account high voltage generation (DC or AC) and its polarity, the impact of the environment and electric field inhomogeneity. A detailed analysis and modeling of the sparking process was carried out given the polarity of the applied control voltage and the design principles of creating a strongly inhomogeneous electric field in the interelectrode gap. The possibility of monitoring dielectric coatings with a thickness of 25 μm or more while reducing the control voltage without reducing the reliability of the results is shown, which is especially important when testing the continuity of paint coatings of large area objects.
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