Glycine as an Efficient Corrosion Inhibitor for TiN Oxidation Environments

In this study, the inhibition effect of glycine on TiN corrosion in hydrogen peroxide (H2O2) solution was studied through polishing experiments, static corrosion tests and electrochemical tests. According to the results of electrochemical impedance spectroscopy (EIS), 3 wt% glycine exhibited an inhibition efficiency of more than 78% for TiN corrosion due to the greatly increased charge transfer resistance at the TiN/solution interface after its addition. Scanning electron microscopy (SEM), atomic force microscopy (AFM) and Fourier transform infrared (FTIR) spectroscopy analysis provided evidence that glycine molecules adsorbed on the TiN surface to form a protective film to prevent corrosion. Adsorption isotherm studies demonstrate that spontaneous, mixed physical and chemical adsorption occurs, which follows the Temkin model. The corrosion inhibition mechanism was investigated by X-ray photoelectron spectroscopy (XPS). The results show that glycine molecules can prevent TiN from being oxidized to titanium oxide, thus reducing the corrosion intensity. This study is of importance in solving the problem of a too fast corrosion rate of TiN in an oxidizing environment.