The corrosion behavior of copper in neutral NaCl solutions in the presence of benzotriazole (BTAH) was studied by potentiodynamic polarization, Fourier transform infrared spectroscopy (FTIR), and x-ray photoelectron spectroscopy (XPS). The thermodynamic parameter reveals that a decrease in the current density of the dissolution process is mainly controlled by the activation parameters when the BTAH concentration is low, whereas the control changed to the pre-exponential factor with increasing BTAH concentration from 10 mg/L to 40 mg/L from the potentiodynamic polarization results. Cu2O, CuO, Cu(OH)2, and Cu(I)BTA were all detected on the copper surface under our experimental conditions. When the BTAH concentration is low, the δ(Cu2+) value increases sharply, whereas a gradual increase occurs when the BTAH concentration increases from 10 mg/L to 40 mg/L, which may be ascribed to the competitive reaction of Cu2+ and Cu(I)BTA with a preference for Cu(I)BTA film formation.

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