Effect of nitrogen-ion implantation on the corrosion resistance of OT-4-0 titanium alloy in 0.9% NaCl environment

Abstract

Abstract This work presents data on the properties of the surface layer of OT-4-0 titanium alloy after nitrogen-ion implantation. Polished samples were implanted with nitrogen doses of 1×1016, 1×1017, 6×1017 and 1×1018 N+ cm−2. The corrosion resistance was examined by the electrochemical methods in 0.9% NaCl at a temperature of 37 °C. Structural examinations were made with a transmission electron microscope. Depth profiles of nitrogen were investigated by secondary-ion mass spectrometry. The phase composition of the implanted layers and the residual stresses induced in them during the implantation were examined by the X-ray diffraction method using a Dosophatex system. It was found that the increase of the corrosion resistance depends on the nitrogen dose employed; the maximum improvement of the corrosion resistance was observed with a dose of 1×1017 N+ cm−2.