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Study of the corrosion and inhibition processes of a carbon steel in a low conductivity medium by electrochemical methods

Authors
Journal
Electrochimica Acta
0013-4686
Publisher
Elsevier
Publication Date
Volume
30
Issue
3
Identifiers
DOI: 10.1016/0013-4686(85)80196-1
Disciplines
  • Chemistry
  • Earth Science

Abstract

Abstract Ohmic drop corrected steady-state current—voltage curves and electrochemical impedance diagrams have been obtained for carbon steel rotating disc electrodes in 200 mg l −1 NaCl solutions with and without addition of 1 g l −1 of the association of oleylamino propylene and amino-tri[methyl-phosphonic] acid (FA + TMPA). Corrosion rates determined from both steady state and impedance data are in fairly good agreement with those determined from gravimetric measurements carried out on a semi-pilot scale circuit. Because impedance measurements are non-destructive and not affected by low electrolyte conductivity, they allow us to follow the evolution of the corrosion rate as a function of time: in the absence of inhibitor the corrosion rate increases during the early stages of immersion whereas it decreases in the presence of 1 g l −1 (FA + TMPA). Impedance diagrams obtained in inhibited solutions reveal a high frequency loop unobserved in the absence of the inhibitor; the very low value (1–2 μF cm −2) of the capacity associated to this loop suggests that the inhibitor (FA + TMPA) acts in forming a relatively thick and compact protective film on the metal surface.

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