Corrosion Behaviour of Titanium Nitride Coating on Titanium and Zircaloy-4
The present study deals with growth of TiN coatings deposited by plasma enhanced physical vapor deposition (PEPVD) on commercial titanium substrate and zircaloy-4. The composition, microstructure and residual stresses of the coatings were determined by scanning electron microscopy (SEM), photoelectron spectroscopy generated by X-rays (XPS/ ESCA) and X-ray diffraction. The anodic behaviour of TiN layers were investigated by means of potentiodynamic anodic polarization curves and galvanostatic experiments, in 0.1M NaCl solution at room temperature. The results were compared with those obtained for the non-coated materials in the same experimental conditions. Results showed that in the corrosive media tested the anodic behaviour of the coated materials was somewhat different from the anodic behaviour of the uncoated material. However, the corrosion performance of both titanium and Zyr-4 is not markedly modified by the TiN coating. In another series of experiments the electronic properties of the coating were investigated by measuring the anodic and cathodic polarization curves in a solution containing a redox system (Na2SO4 0,1M + K4[Fe(CN)6] 0,05M+ K3[Fe(CN)6] 0,05M). The TiN film possess an electronic conductivity higher than the electronic conductivity of the oxide film present on the Ti and Zyr-4 surface, therefore may be used in applications where a good electrical conductivity is required
Corrosion, TiN, Ti, Zry-4, PEPVD, Electronic Conductivity, Coating
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