Static and Dynamic Phenomena during the Electrodissolution of Steel in Aqueous NaCl Solutions

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概要

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• The static and dynamic characteristics of the electrodissolution of steel covered with an organic layer as well as of plain steel are studied in aqueous solutions of various NaCl concentrations. Anodic polarization and electrochemical impedance spectroscopy for plain steel indicate that active dissolution takes place in a potential region close to the open circuit potential where the current is less than 10−4 A. Similar experiments for coated steel suggest the adsorption of ionic species and the formation of a surface layer on the metal substrate. This layer results in a negative faradaic resistance, i.e. a potential region where the faradaic current is a decreasing function of the potential. This region of negative faradaic resistance is related to the occurrence of current oscillations. These oscillations, of a period ranging from 100 to 1200 s, might be attributed to the formation/dissolution of a salt precipitant within the pores of the organic layer.

• 公益社団法人 電気化学会の論文

著者

• Karantonis Antonis

  Department Of Chemistry Faculty Of Science Saitama University

• Ghivalos L.

  Department Of Materials Science And Engineering School Of Chemical Engineering National Technical Un

• Kouloumbi N.

  Department Of Materials Science And Engineering School Of Chemical Engineering National Technical Un

• Marcheva Y.

  Department Of Chemistry Technical University Of Sofia

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• Static and Dynamic Phenomena during the Electrodissolution of Steel in Aqueous NaCl Solutions

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