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TitleCorrosion behavior of titanium oxynitrided by diffusion and magnetron sputtering methods in physiological solution
Author(s)Pohrelyuk, I. M.
Yaskiv, O. I.
Tkachuk, O. V.
Barradas, N. P.
Alves, E.
Vaz, F.
Cunha, L.
Diffusion saturation
Magnetron sputtering
Oxynitride coatings
Physiological solution
Titanium alloy grade 2
Issue date12-Sep-2017
PublisherASTM International
JournalMaterials Performance and Characterization
CitationPohrelyuk, I., Yaskiv, O., Tkachuk, O., Barradas, N., Alves, E., Vaz, F., and Cunha, L., "Corrosion Behavior of Titanium Oxynitrided by Diffusion and Magnetron Sputtering Methods in Physiological Solution," Materials Performance and Characterization, Vol. 6, No. 4, 2017, pp. 594-606, ISSN 2379-1365
Abstract(s)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 (TiN x O y) coating deposited by magnetron sputtering—in physiological solution. Structural analysis has shown that TiN x O y 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 TiN x O y 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 TiN x O y film to substrate. The presence of an oxygen diffusion layer leads to a stronger bond. It was found that a TiN x O y 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, 50?m thick, assists in additional enhancement of corrosion properties 1.5 to 3 times.
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AccessRestricted access (UMinho)
Appears in Collections:CDF - GRF - Artigos/Papers (with refereeing)

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