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2016-08-18 - Colloque/Présentation - communication orale - Anglais - 1 page(s)

Bertolucci Coelho Leonardo , Mouanga Maixent, Druart Marie-Eve , Recloux Isaline, Cossement Damien, Olivier Marie-Georges , "A SVET study of the inhibitive effects of benzotriazole and cerium chloride solely and combined on an aluminium/copper galvanic coupling model" in EMNT2016, Bruxelles, Belgique, 2016

  • Codes CREF : Enseignement des sciences de l'ingénieur (DI0132), Corrosion des matériaux (DI2114)
  • Unités de recherche UMONS : Science des Matériaux (F502)
  • Instituts UMONS : Institut de Recherche en Science et Ingénierie des Matériaux (Matériaux)
  • Centres UMONS : Ingénierie des matériaux (CRIM)

Abstract(s) :

(Anglais) An aluminium/copper galvanic coupling model suitable for Scanning Vibrating Electrode Technique (SVET) analysis was elaborated with the aim of simulating a galvanic couple characteristic of AA 2024. So as to better highlight local anodic and cathodic processes, the galvanic couple was simulated by separating the cell components [1,2]. In NaCl-containing solutions, the Al/Cu galvanic coupling behaves as follows: the Al electrode is preferentially corroded while the Cu electrode is protected, being the site where the oxygen reduction reaction occurs. In this work, the inhibitive effects brought by benzotriazole (BTA) and cerium chloride (CeCl3) on the Al/Cu model were evaluated, separately and combined, in neutral aerated sodium chloride solutions. A positive synergistic effect was revealed yielding permanent corrosion protection for 46 h of immersion (Figure 1). Optical microscopy analysis of the electrode surfaces assisted the interpretation of the SVET results. Finally, ToF-SIMS was used to confirm the chemical identity of the BTA-based/Cerium hydroxide (oxide) protective film formed onto Cu surface.