D. Krupa et al., Effect of carbon ion implantation on the structure and corrosion resistance of OT-4-0 titanium alloy, SURF COAT, 114(2-3), 1999, pp. 250-259
This work presents the results of investigation of the properties of OT-4-0
titanium alloy surface layers subjected to carbon implantation. Polished s
amples were implanted with carbon doses:of 5 x 10(15), 1 x 10(16), 1 x 10(1
7), and 2 x 10(17) C+ cm(-2) at an energy of 100 keV. The corrosion resista
nce was examined by the Stern and potentiodynamic methods in 0.9% NaCl solu
tion at a temperature of 37 degrees C. The composition and structure of the
implanted layers were investigated by XPS, SIMS and TEM. The carbon implan
tation produced TiC precipitates at doses of 1 x 10(16) C+ cm(-2) or less;
and a continuous solid layer of TiC at the further doses. The results from
the electrochemical measurements provide evidence that carbon implantation
at higher doses increases the corrosion resistance. The hardness of OT-4-0
titanium alloy is also improved. (C) 1999 Elsevier Science S.A. All rights
reserved.