Electrochemical behavior of copper passivated by BTA and MBT in NaCl solution

The efficiency of benzotriazole(BTA) and 2-mercaptobenzothiazole(MBT) as corrosion inhibitors for copper was investigated in 3.5% NaCl solution.Potentiodynamic polarization and cyclic voltammogram and AC impedance spectroscopy were applied to study the electrochemical behavior of copper electrodes passivated by inhibitors and their complex.The results is shown that the two compounds suppress both anodic and cathodic corrosion reactions and the film resistance increases in the electrochemical studies.A synergistic effect of BTA and MBT combined inhibitors on copper is observed.SEM images are used to show the synergistic effect directly.