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Electrochemical behavior of thick rust layers on steel artefact: Mechanism of corrosion inhibition

Abstract : The electrochemical behavior of aged corrosion layers (CL) on artefact was studied, in corrosive reference water without and with non-toxic corrosion inhibitors such as decanoate ions and flavonoids compounds, constituting the condensed tannins, such as catechin. Electrochemical impedance spectroscopy measurements on the metal/CL system and voltammetric studies of FeOOH phases on carbon paste electrode show that the corrosion inhibition mechanism is mainly based on the blocking of the dissolution of FeOOH-type phase and the decrease of the diffusion of ionic species in the pores network of CL. Indeed, the formation of iron decanoate, revealed by X-ray diffraction and microscopic observation, inhibits the electrochemical activity of FeOOH-type phases and blocks the electrochemical dissolution of FeOOH into Fe2+ cations. On the other hand, the catechin compound modifies the surface of rust compounds into a blue-black compound, but this modification has a poor influence on the electrochemical activity of FeOOH-type compounds.
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Submitted on : Monday, October 25, 2021 - 10:10:08 AM
Last modification on : Monday, October 25, 2021 - 10:10:12 AM

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Emmanuel Rocca, Hadri Faiz, Philippe Dillmann, Delphine Neff, François Mirambet. Electrochemical behavior of thick rust layers on steel artefact: Mechanism of corrosion inhibition. Electrochimica Acta, Elsevier, 2019, 316, pp.219-227. ⟨10.1016/j.electacta.2019.05.107⟩. ⟨cea-02401231⟩

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