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Abstract

Electrochemical impedance spectroscopy was used to study the behaviour of carbon steel equilibrated in a deaerated solution of inhibitors such as sodium molybdate and potassium chromate to which sodium chloride was added with subsequent aeration. A geometric analysis technique based on the simplest model which can represent a corroding interface was used to analyse the ac impedance results. The polarisation resistance and corrosion potential data obtained showed significant changes upon the addition of sodium chloride and aeration. The summation of the constant phase element or depression angles formed with the real axis in a Nyquist representation was found to correlate with the measured pit depths.

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Evaluation of Corrosion Inhibition with New Electrochemical Impedance Spectroscopy Analysis Technique

Abstract

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