Coupling of electrochemical, electrogravimetric and surface analysis techniques to study dithiocarbamate/bronze interactions in chloride media

Wafaa Qafsaoui (1) , A. Et Taouil (2) , M. W. Kendig (3) , Hubert Cachet (4) , Suzanne Joiret (4) , Hubert Perrot (4) , Hisasi Takenouti (4)

1 Laboratoire de l'eau et de l'Environnement
2 UTINAM - Univers, Transport, Interfaces, Nanostructures, Atmosphère et environnement, Molécules (UMR 6213)
3 Kending Research Associates LLC
4 LISE - Laboratoire Interfaces et Systèmes Electrochimiques

Interaction between ammonium pyrrolidinedithiocarbamate (PDTC) and bronze in 30 g L-1 NaCl was investigated at several concentrations between 0.1 and 10 mM by means of various electrochemical and spectroscopic techniques. Electrochemical measurements revealed a fast adsorption process of PDTC on Cu and Pb and the formation of a thick insulating and protective film with a high surface coverage. At high concentrations, PDTC prevents oxides formation. Surface analyses confirm PDTC adsorption on bronze mainly via interaction between sulphur atoms and Cu sites to form Cu I-PDTC complex.

Mots clés: Bronze; Neutral inhibition; Polarization; EIS; Raman spectroscopy; XPS

Domaines: Chimie

Wafaa Qafsaoui, A. Et Taouil, M. W. Kendig, Hubert Cachet, Suzanne Joiret, et al.. Coupling of electrochemical, electrogravimetric and surface analysis techniques to study dithiocarbamate/bronze interactions in chloride media. Corrosion Science, 2018, 130, pp.190-202. ⟨10.1016/j.corsci.2017.10.034⟩. ⟨hal-01643537⟩