The application of impedance measurements for the determination of the probability of the course of corrosion processes

摘要

Impedance measurements have been carried out of a number of epoxide coatings on steel in hydrochloric acid solution. The thicknesses of the tested epoxide coatings were similar. For each coating the dependence has been determined of the electric capacitance of the coating in the function of time. By assuming the threshold value of the coating electric capacitance the distribution function of the course of corrosion processes occurring under the coating has been determined. The presented procedure allows a rational evaluation of the protective properties of organic coatings.