Evaluating Corrosion and Passivation by Electrochemical Techniques

A. M. Taher
Al Gharbi University, P.O. Box 13575, Alfornaj, Tripoli, Libya
Abstract—In this study, the electrochemical techniques which are used to analyze the corrosion behavior and the passive films are introduced in details. These electrochemical techniques include Linear Sweep Voltammetry (LSV), Cyclic Polarization (CP), Cyclic Voltammetry (CV), Tafel Extrapolation (TE) and Electrochemical Impedance Spectroscopy (EIS). The advantages and the disadvantages of these techniques are also introduced in this study. As an example to examine the efficiency and performing of these techniques, electrochemical measurements are carried out in a three-electrode system where commercial copper nickel alloy C70600 is used as a working electrode. These measurements are performed in natural sea water and in artificial saline solutions with different sulphate content. Results obtained by using these electrochemical methods in this investigation are compared with the results from conventional immersion tests in other previous studies. It concludes that these techniques provide a very convenient and efficient way to evaluate the corrosion and the passivation processes in both laboratory and field in a very short time. 

Index Terms—linear sweep voltammetry, cyclic polarization, cyclic voltammetry, Tafel extrapolation, electrochemical impedance spectroscopy, copper-nickel alloys

Cite: A. M. Taher, "Evaluating Corrosion and Passivation by Electrochemical Techniques," International Journal of Mechanical Engineering and Robotics Research, Vol. 7, No. 2, pp. 131-135, March 2018. DOI: 10.18178/ijmerr.7.2.131-135
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