Abstract
Physical vapour deposition (PVD) and ion beam assisted deposition (IBAD) were applied to produce silicon carbide (SiC) thin films on the surface of Ti–6Al–4V alloy (T6A4V) aiming at the improvement of its corrosion resistance. Diamond-like carbon (DLC) coatings were also prepared using the above techniques in combination with plasma enhanced chemical vapour deposition (PECVD). The Si-, C- and O-content and depth distribution in the films was determined using Rutherford backscattering spectrometry (RBS) and nuclear reaction analysis (NRA). The corrosion resistance of the coated samples was investigated under aggressive conditions (0.5M H2SO4 at R.T and 5M HCl at 50°C) using polarization techniques. The surface morphology and microstructure of the initial and the corroded samples were examined by scanning and transmission electron microscopy (SEM and TEM). The thickness of the coatings remained practically unchanged after the corrosion attack, whereas the corrosion resistance of the coated materials seems to be related with the amorphous structure of the modified surface.
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