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The paper concerns the problem of evaluation of stationarity of carbon steel corrosion in 1M HCl.Comparison of corrosion rate with addition of corrosion inhibitor to the reference measurement is themost often used way of evaluating inhibitor efficiency. Such an approach is valid only if corrosion rateis a stationary process. Two complementary techniques were used simultaneously: volumetric analysisof evolved hydrogen and instantaneous impedance spectroscopy monitoring. Changes of the electrodesurface area and chemical composition have a major impact on the dynamics of both cathodic andanodic processes. On the base obtained results, authors claim that the stationarity of the processdetermined most often on the base of corrosion potential is ineffective and insufficient.

Instantaneous Impedance Analysis of Non-Stationary Corrosion Process: a Case Study of Carbon Steel in 1M HCl