METROLOGICAL ANALYSIS OF THE CHANNEL FOR MEASURING THE IMPEDANCE OF A GALVANIC CELL IN THE PROCESS MICRO-ARC OXIDATION

Abstract

Backgroung. The object of the study is a measuring converter of the impedance of a galvanic cell in the process of micro-arc oxidation. To ensure guaranteed accuracy of measurements of the active and reactive resistances of oxide layers, the actual problem of developing and metrological analysis of the impedance measuring converter of synthesized coatings is solved. The aim of the work is to obtain analytical expressions for the conversion function and errors of the impedance measurement channel. Materials and methods. The application of the micro-arc oxidation method is considered in relation to the modification of the surface of products made of valve metals and alloys. To achieve this goal, the methods of functional metrological analysis, theoretical metrology, and electrical engineering were used. Results. The structure of the measuring converter of the impedance of the galvanic cell and the conductivity of the electrolyte is developed. An analytical description of the complex conductivity of a galvanic cell is obtained. A functional and metrological analysis of the measuring channels of the developed measuring converter was performed, which made it possible to determine the metrological characteristics and estimate the value of the main instrumental error. Conclusions. Due to the possibility of measuring the impedance of the galvanic cell and the conductivity of the electrolyte, the developed measuring converter can be used not only for non-destructive testing of the MDO process in production, but also in scientific research. The expressions obtained during the metrological analysis for calculating the conversion functions and errors of the measuring channels of the converter allow us to guarantee high measurement accuracy.

Keywords

• micro-arc oxidation
• galvanic cell impedance converter
• metrological analysis
• conversion function
• measurement error