It is shown that reducing the degradation of material in near-surface areas, which progresses over time, not only during operation, but also during storage of finished products, should be one of the basic goals of modern technical solutions and should be the subject of more intensive research, development and application work than before. The analysis of the corrosion properties of various materials using the method of potentio-dynamic electrical impedance spectrometry is possible thanks to equipping research laboratories with appropriate control and measurement equipment that largely uses modern information techniques, especially digital signal processing.