Yumuşak Çelik ve Bakır Yüzeyine Tiox’in Katodik Sentezi ve Sülfürik Asit Ortamında Korozyon Performansı

Abstract

The synthesis of the Magneli phase TinO2n-1 (TiOx) was carried out on mild steel (MS) and copper (Cu) electrode by using cyclic voltammetry (CV) and chronocoulometry methods at room temperature in acetonitrile solution containing 0.005 M TiOClO4.6H2O and 0.05 M tetrabutyl ammonium perchlorate (TBAP). For optimization, different potential intervals, cycle numbers and electrolysis durations were examined. As a result TiOx coatings were performed using cyclic voltammetry at a potential interval of (0.0V)-(-2.2V) with 20 cycle for MS and using choronopotentiometric method at a potential of -1.5V with 30 minute for Cu electrode. TiOx coating was also assessed by performing in different titanium solutions, by using cyclic voltammetry and electrochemical impedance spectroscopy (EIS). The homogenous dispersed TiOx coating was obtained as porous structure on electrodes from the results of SEM-EDX technique and EDX-Ti mapping.Titanium oxide phases in the coatings were identified by XRD results. XPS and TEM analysis were performed to determine the oxidation state of titanium and the size of TiOx particals, respectively. The wettability properties of the coatings with nano-sized TiOx were determined by contact angle measurements. Electrochemically synthesized coatings on the surface of the MS and Cu electrodes were evaluated by long term OCP, EIS and Tafel analysis. It was determined that TiOx coatings synthesized in solution containing TiOClO4.6H2O on both MS and Cu electrode surface, provide 10 times more protection for MS and 3 times more for Cu in 0.5 M H2SO4 medium.