EVALUATION METHOD OF QUANTITATIVE DETERMINATION IN COATED MATERIALS BY ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY

摘要

The present invention relates to a method of measuring the porosity of the coating material with the EIS, the surface treatment is a coating material step of selecting and; By the coating material to be evaluated in the positive electrode, and then, where a certain corrosive environment comprising the steps of configuring a three-electrode electrochemical cell with the electrolyte; The porosity measured according to the method of using a coating material consisting of EIS collecting data through the EIS, to calculate the porosity of the coating material by using the polarization resistance (R _p ) of the output from the EIS and the first step; And pore expansion rate using the data gathered through the EIS to minimize the calculation error of the porosity, the charge transfer resistance (R _ct ) a second step of setting the threshold value to calculate the time and; Based on the threshold time set through the pore expansion ratio and the charge transfer resistance from the initial immersion of the porosity adds to the threshold time, calculates the average by constructing a third step of deriving a net porosity, existing in and out of the coating material a defect and a non-destructive, and increasing the reliability of the coating material through a quantitative way, more precise and fine-nm pore size unit it is possible to measure the accurate control of the defect rate that determines the durability of the coating material and ultimately in premature it is possible to secure the quality, the present invention relates to a method of measuring the porosity of the coating material with the EIS to predict the life of the coating material.