ANALYSIS OF THE APPLICABILITY OF THICKNESS MEASUREMENT METHODS DIELECTRIC LAYERS IN CONTROLLED SYNTHESIS PROTECTIVE COATINGS BY MICRO-ARC METHOD OXYGENATING 

Golubkov Pavel Evgen’evich, postgraduate student, engineer, sub-department of information-measuring equipment and metrology, Penza State University (40 Krasnaya street, Penza, Russia), E-mail: golpavpnz@yandex.ru 

62-791.2 

10.21685/2307-5538-2020-1-11 

Background. The object of the study is methods for measuring the thickness of oxide coatings on metal non-ferromagnetic substrates. The subject of the study is the essence and metrological characteristics (measurement range, errors) of existing methods for measuring the thickness of oxide coatings on metal non-ferromagnetic substrates. The purpose of this work is to select a method for measuring the thickness of oxide layers for continuous measurement and control of the thickness of protective coatings obtained by micro-arc oxidation (MAO) during their controlled synthesis.
Materials and methods. To achieve this goal, a systematic approach is used to review and analyze existing methods for measuring the thickness of oxide coatings and their metrological characteristics.
Results. An analytical review of methods for measuring the thickness of oxide coatings on metal substrates is carried out, which allows us to determine the most appropriate method for measuring the thickness that meets the requirements and takes into account the specificity of the micro-arc oxidation process.
Conclusions. The analytical review allows us to conclude that the most suitable methods for measuring the oxide coatings thickness in the process of micro-arc oxidation are electrical methods, in particular, the method using a frequency integrating scanning converter (FISC). This method makes it possible to carry out continuous measurements of the thickness of oxide layers directly in the process of their forming with high accuracy and can be used in the development of an intelligent automated system for the controlled synthesis of MAO coatings. 

micro-arc oxidation, thickness measurement methods, measurement range, error, automated controlled synthesis