[1A2] High-voltage control of dielectric coatings thickness
V A Syasko and A S Musikhin
Constanta Ltd, Russia
By the application technology for many coatings they should consist of the visually indistinguishable layers. However, application technology violation could lead to the unacceptable coating thickness. Thus, in a number of cases, it is necessary to control the number of layers for final coating system. One of the most common methods for monitoring the continuity of coatings is the high voltages testing method. The analysis shows that method detects not only discontinuities, but it also detects unacceptable thinning of dielectric coatings by their spark breakdown.
In relation to high voltages testing, the electrical mechanism of the solid state dielectrics breakdown, the conditions of its occurrence, and the main relations obtained for calculating the electric strength Es and breakdown voltage Us for protective dielectric coatings are considered. Comparative results of an experimental study of the proposed algorithms for calculating Es and Us, as well as methods for identifying (tolerance control) sections of paint coatings with an unacceptable minimum thickness and coating bubbles, are presented. The application of the proposed algorithms and methods will allow one hundred percent control of the continuity and unacceptable thinning of paint and similar dielectric protective coatings of the various large area facilities.
In relation to high voltages testing, the electrical mechanism of the solid state dielectrics breakdown, the conditions of its occurrence, and the main relations obtained for calculating the electric strength Es and breakdown voltage Us for protective dielectric coatings are considered. Comparative results of an experimental study of the proposed algorithms for calculating Es and Us, as well as methods for identifying (tolerance control) sections of paint coatings with an unacceptable minimum thickness and coating bubbles, are presented. The application of the proposed algorithms and methods will allow one hundred percent control of the continuity and unacceptable thinning of paint and similar dielectric protective coatings of the various large area facilities.
