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The electrochemical behaviour of titanium dissolution and passivation in HCl was examined with and without the SCN −  anions using potentiodynamic polarisation, electrochemical impedance spectroscopy, and current transients techniques. The nature of the Ti oxide film was characterised by utilising XPS and SEM tools. The corrosion current  icorr , the critical passivation current  icc , and the passive current  ipass  values increased significantly when the HCl concentration, scan rate, and temperature were raised. On the contrary, the addition of SCN −  anions decreases the  icorr  value, indicating that the Ti dissolution was inhibited as a result of SCN −  adsorption on the Ti surface. The inhibition efficiency increased with increasing the concentration of SCN − . However, SCN −  anions lead to destabilised passivity in the passive zone. The formation of the Ti oxide film is a diffusion-controlled operation, as shown by the  i – t  curves. According to the XPS measurements, the passive oxide coating consists mainly of TiO 2  and less of Ti 2 O 3 .

The bifunctional role played by thiocyanate anions on the active dissolution and the passive film of titanium in hydrochloric acid