Corrosion protection of bronze using 2,5-dimercapto-1,3,4-thiadiazole as organic inhibitor: spectroscopic and electrochemical investigations

Abstract : Effect of 2,5-dimercapto-1,3,4-thiadiazole (DMTD) concentration on the electrochemical behaviour of bronze was studied in 30 g L-1 sodium chloride (NaCl) by means of surface analyses and electrochemical techniques. Scanning Electron Microscopy (SEM) was used to observe surface morphology. Raman micro-spectroscopy was carried out to study chemical structure of deposited layers. X-ray photoelectron spectroscopy (XPS) enabled elemental characterization as well as molecular structure investigation. Finally, electrochemical polarization and impedance permitted a thorough study of corrosion protection behaviour reached through the presence of DMTD based organic layers on the surface. Above 1 mM, a fast adsorption of DMTD on copper (Cu) and lead (Pb) allows a thin and blocking film to be formed on bronze surface. DMTD prevents oxide formation at high concentrations and the surface film is mainly composed of Cu I-DMTD and Cu II-DMTD complexes as evidenced by spectroscopic techniques, with a bidentate adsorption at 1 mM and monodentate adsorption at 10 mM.
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Submitted on : Monday, September 9, 2019 - 11:41:11 AM
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Wafaa Qafsaoui, A. Et Taouil, M. Kendig, O. Heintz, Hubert Cachet, et al.. Corrosion protection of bronze using 2,5-dimercapto-1,3,4-thiadiazole as organic inhibitor: spectroscopic and electrochemical investigations. Journal of Applied Electrochemistry, Springer Verlag, 2019, 49 (8), pp.823-837. ⟨10.1007/s10800-019-01329-8⟩. ⟨hal-02281487⟩

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