Optical interferometry techniques were used for the first time to measure the surface resistivity/conductivity of carbon steel samples in blank seawater and in seawater with different concentrations of a corrosion inhibitor, without any physical contact. The measurement of the surface resistivity/conductivity of carbon steel samples was carried out in blank seawater and in seawater with a concentration range of 5-20ppm of KGR-134 corrosion inhibitor, at room temperature. In this investigation, the real-time holographic interferometry was carried out to measure the thickness of anodic dissolved layer or the total thickness, Utotal, of formed oxide layer of carbon steel samples during the alternating current (AC) impedance of the samples in blank seawater and in 5-20 ppm inhibited seawater, respectively. In other words, the surface resistivity/conductivity of carbon steel samples was determined simultaneously by holographic interferometry, an electromagnetic method, and by the Electrochemical Impedance (E.I) spectroscopy, an electronic method.

Subject
Electrochemical impedance spectroscopy, Steel surfaces, Oxide formation, Oxide layers, Impedance, Interferometry, Anode surfaces, Seawater, Electrical resistivity, Corrosion inhibitors, AC interference, Carbon steel, Samples
Keywords:
Electrical Resistivity, Electrical Conductivity, Alternating Current (AC) Impedance (Resistance), Holographic Interferometry, Carbon Steel, and Seawater, Corrosion Inhibitor, and Fe oxide-hydroxides
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2011
Association for Materials Protection and Performance (AMPP)
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