Bis-triazole as a new corrosion inhibitor for copper in sulfate solution. A model for synergistic inhibition action

Bis-[4H-5 hydroxy-1, 2, 4-triazol-3-yl] methane "BHTAM" was tested as a promising new inhibitor for copper corrosion in 0.5 M Na2SO4 solutions using open - circuit potentials and galvanostatic polarization techniques. The results show that, BHTAM is an efficient inhibitor for copper corrosion in neutral medium. The anodic polarization is strongly affected by the presence of BHTAM compound as well as the cathodic polarization but to a lesser extent. The surface condition plays a significant role in the protection of copper. The pre-formed surface cuprous oxide films facilitate inhibitor adsorption as well as precipitation of insoluble [Cu (I) - BHTAM] complex. (C) 2000 Kluwer Academic Publishers.