Properties of CrN Coating Prepared by Physical Vapour Deposition
The present study focused on growth of CrN coating deposited by plasma enhanced physical vapor deposition (PEPVD) on commercial titanium substrate. 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. To evaluate the performance against corrosion potentiodynamics polarization curves were performed in 0.1 N NaCl and H2SO4 5% solutions at room temperature and in nitrogen atmosphere. The results were compared with the uncoated material under the same experimental conditions. It was found that the coated materials have lower corrosion rate than the uncoated materials. The presence of the coating leads to an increase in resistance to polarization and a decrease of two orders of magnitude in the critical current density of passivation.
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