Abstract
The relationship between structural behaviour of sputtered TiC/amorphous C (TiC/a:C) thin films and corrosion properties was measured in three various pH solutions (0.5M NaCl (pH=6); 0.1M HCl (pH=1); and 0.1M NaOH (pH=13)). The ~400nm thick nanocomposites were deposited by DC magnetron sputtering on different substrates (Ti6Al4V alloy and CoCrMo alloy) in argon at 25°C and 0.25Pa with 150W input power of carbon target and 50W input power of titanium target. The structure and composition of nanocomposites were investigated by Transmission and Scanning Electron Microscopy. In both samples the structural investigations confirmed columnar structure of TiC/a:C films with 25–50nm sized cubic TiC. These columns were separated by 2–3nm thin amorphous carbon layers. TiC/a:C /Ti6Al4V alloy implant material showed better corrosion resistance than the TiC/a:C/CoCrMo alloy in 0.5M NaCl solution based on results of the Electrochemical Impedance Spectroscopy. For both samples, the 0.1M NaOH solution was the most corrosive media.
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