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Capacitance measurement; Chlorine compounds; Concretes; Corrosion; Electrochemical corrosion; Electrochemical impedance spectroscopy; Electronic properties; Ferrite; Ferritic steel; Pitting; Sodium compounds; Tin; Tin alloys; X ray photoelectron spectroscopy, Beneficial effects; Bi-layer structure; Electrochemical behaviors; Electrochemical behaviour; ELectrochemical methods; Ferritic stainless steel; Semi-conducting property; Sn elements, Stainless steel
Abstract:
In the present work, the electrochemical behavior and semiconducting properties of a tin alloyed ferritic stainless steel in simulated concrete solution in presence of NaCl were estimated by conventional electrochemical methods such as potentiodynamic polarization, electrochemical impedance spectroscopy, and capacitance measurement (Mott-Schottky approach). The surface passive film was analyzed by X-ray photoelectron spectroscopy. The results revealed a good agreement between pitting corrosion, electrochemical behaviour, and electronic properties. The p and n-type bilayer structure passive film were observed. The increase of Sn4+ oxide species in the passive film shows no beneficial effects on the pitting corrosion. In addition, the dehydration of the passive film was further discussed. © 2017 Elsevier B.V.
