AC impedance techniques offer the advantage that low conductivity of the electrolyte does not affect the accuracy of the measurement in the same manner as for DC techniques (1). In addition, mechanistic information can be obtained from the shape of the impedance diagrams (2,3) which is important for the evaluation of corrosion inhibition. A brief description of the background of AC impedance measurements will be given followed by experimental results for iron in acid media containing corrosion inhibitors (3).

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