Impedance measurements of corroding mild steel in an automotive fuel ethanol with and without inhibitor in a two and three electrode cell - Sorbonne Université
Article Dans Une Revue Corrosion Science Année : 1987

Impedance measurements of corroding mild steel in an automotive fuel ethanol with and without inhibitor in a two and three electrode cell

Résumé

The impedance measurements in a highly resistive electrolyte medium are difficult. The use of two identical electrode cells having a large surface area may overcome this difficulty, but measurements have to be restricted to the corrosion potential. The advantages of each type of cell are discussed. The electrochemical system tested in this work was the corrosion of mild steel in an automotive fuel ethanol with or without ethanolamines as corrosion inhibitors. It was found that in a three electrode cell, the use of a special electronic circuit increasing the input impedance of reference electrode was necessary to perform correct measurements. No particular care was needed in the impedance measurements in a two electrode cell. If the two electrode plates were set too close, the measured impedance was significantly great, thus leading to an erroneous prediction of the corrosion behaviour. A tentative explanation to this phenomenon is given.

Domaines

Chimie

Dates et versions

hal-04642940 , version 1 (10-07-2024)

Identifiants

Citer

J.P. de Souza, O.R. Mattos, L. Sathler, Hisasi Takenouti. Impedance measurements of corroding mild steel in an automotive fuel ethanol with and without inhibitor in a two and three electrode cell. Corrosion Science, 1987, 27 (12), pp.1351-1364. ⟨10.1016/0010-938X(87)90130-2⟩. ⟨hal-04642940⟩
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