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    Volume 6, Issue 4 (October 2017)

    Special Issue Paper

    Corrosion Behavior of Titanium Oxynitrided by Diffusion and Magnetron Sputtering Methods in Physiological Solution

    (Received 1 June 2016; accepted 4 May 2017)

    Published Online: 2017

    CODEN: MPCACD

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    Abstract

    This work presents the study of the corrosion-electrochemical behavior of titanium alloy Grade 2 treated with combined coatings—presaturation with nitrogen diffusion layer by thermal-chemical treatment, oxygen diffusion layer by thermal-chemical treatment, and a titanium oxynitride (TiNxOy) coating deposited by magnetron sputtering—in physiological solution. Structural analysis has shown that TiNxOy can be represented as a face-centered cubic (fcc) structure in which nitrogen atoms are replaced by oxygen atoms, or oxygen atoms are replaced by nitrogen atoms. Presaturation of titanium Grade 2 with oxygen and nitrogen leads to the formation of TiNxOy with near equiatomic composition at subsequent oxynitriding by magnetron sputtering. Rutherford backscattering spectrometry (RBS) measurements show the homogeneity of the coating composition. The surface of titanium Grade 2 with a nitrogen diffusion layer presents the highest lightness factor and reflectivity in the range of the visible spectrum. Diffusion presaturation of titanium Grade 2 with either oxygen or nitrogen provides better adhesion of TiNxOy film to substrate. The presence of an oxygen diffusion layer leads to a stronger bond. It was found that a TiNxOy coating increases the corrosion resistance (isotonic solution of 0.9 % sodium chloride (NaCl)) 1.2 times as compared to a nontreated alloy. When the titanium alloy was presaturated with oxygen or nitrogen, the combination of the Physical Vapor Deposition (PVD) oxynitride coating and the diffusion layer, 50µm thick, assists in additional enhancement of corrosion properties 1.5 to 3 times.

    Author Information:

    Pohrelyuk, I. M.
    Karpenko Physico-Mechanical Institute of National Academy of Sciences of Ukraine 5, Lviv,

    Yaskiv, O. I.
    Karpenko Physico-Mechanical Institute of National Academy of Sciences of Ukraine 5, Lviv,

    Tkachuk, O. V.
    Karpenko Physico-Mechanical Institute of National Academy of Sciences of Ukraine 5, Lviv,

    Barradas, N. P.
    Centro de Ciências e Tecnologias Nucleares, Instituto Superior Técnico, Universidade de Lisboa, Bobadela,

    Alves, E.
    Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa, Bobadela,

    Vaz, F.
    Centro de Física, Universidade do Minho, Braga,

    Cunha, L.
    Centro de Física, Universidade do Minho, Braga,


    Stock #: MPC20160074

    ISSN:2379-1365

    DOI: 10.1520/MPC20160074

    Author
    Title Corrosion Behavior of Titanium Oxynitrided by Diffusion and Magnetron Sputtering Methods in Physiological Solution
    Symposium ,
    Committee B10