EFFECT OF NITROGEN, CARBON AND OXYGEN ION IMPLANTATION ON THE STRUCTURE AND CORROSION RESISTANCE OF OT-4-0 TITANIUM ALLOY

D. Krupa1, J. Baszkiewicz1, E. Jezierska1, J. Kozubowski1, A. Barcz2

1 Department of Materials Science and Engineering, University of Technology, 85 Narbutta Str., 02-507 Warsaw, Poland
2 Institute of Electron Technology, Al. Lotnikow 46, 02-668 Warsaw, Poland

This work presents the data on the properties of the surface layer of OT-4-0 titanium alloy after ion implantation. Polished samples were implanted with nitrogen doses of 1x1016, 1x1017, 6x1017 and 1x1018N+/cm2, carbon doses 5x1015, 1x1016, 1x1017 and 2x1017C+/cm2 and oxygen doses 5x1016, 1x1017, 5x1017 and 1x1018O+/cm2. The corrosion resistance was examined by electrochemical methods in 0.9% NaCl at the temperature 37oC or in 3% NaCl at the temperature 20oC. The transmission electron microscopy was used to investigate the microstructure of implanted layers formed on OT-4-0. The chemical composition of the surface layers was examined by the secondary ion mass spectroscopy (SIMS). The increase of corrosion resistance has been observed as a result of structural modification of the surface layer.