Photocathodic Protection of TiO2 Composite Material on 304 Stainless Steel
TiO2 nanotubes was prepared by anodization method, and CdSe was deposited on the TiO2 nanotube arrays by cyclic voltammetry method, and the optimum condition was selected from different cycles. The surface morphology and crystal phase of the composite was investigated by scanning electron microscopy (SEM), X ray diffraction (XRD) method.
The photocathodic protection property of the composite material for 304 stainless steel in seawater was investigated by the electrochemical method including open circuit potential (OCP), electrochemical impedance spectroscopy (EIS) and the tafel polarization curves method. The experimental results showed that open circuit potential of 304 stainless steel decreased from -190mV to -500mV when the light was turned on, and the electrode potential slowly rises to about -250mV after the light was turned off. The composite material still could maintain the protective effect on stainless steel after the light was turned off.
The work was supported by the Project of National Development and Reform Commission, the Nantong Science Project (BK2014008), and National Basic Research Program of China (2014CB643304).