Corrosion resistance of nitrided and oxynitrided layers produced on titanium Grade 2 in glow discharge assisted processes

摘要

Specific properties of titanium and its alloys, such as: low density, high specific strength and corrosion resistance and also low Young Modulus are the reasons for the increas use of these materials in medicine. Together with Ti6A14V alloy, Grade 2 titanium is also used for bone and cardiac implants. In order to improve their biological properties numerous surface treatments are used, such as nitriding and oxynitriding in glow discharge conditions, which - apart from enhancing the wear resistance - are supposed to limit the diffusion of alloying elements into the surrounding tissue (so called methalosis effect), therefore increase the corrosion resistance. This paper presents the study of corrosion resistance in Ringer solution of titanium Grade 2 in comparison to the layers produced in nitriding process and with the hybrid method - oxynitriding process which combines nitriding with oxidizing under glow discharge conditions.