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Study of Corrosion Behavior and In Vitro Bioactivity of Single NbSi 2 and Duplex NbSi 2 /Nb 5 Si 3 Coatings on Nb Substrates for Biomedical Applications
Protection of Metals and Physical Chemistry of Surfaces ( IF 1.1 ) Pub Date : 2020-08-03 , DOI: 10.1134/s2070205120030120 Mohammadreza Daroonparvar , Muhamad Azizi Mat Yajid , Hamid Reza Bakhsheshi-Rad , Rajeev Kumar Gupta , A. F. Ismail
中文翻译:
Nb基体上单一NbSi 2和NbSi 2 / Nb 5 Si 3双层涂层在生物医学应用中的腐蚀行为和体外生物活性的研究
更新日期:2020-08-03
Protection of Metals and Physical Chemistry of Surfaces ( IF 1.1 ) Pub Date : 2020-08-03 , DOI: 10.1134/s2070205120030120 Mohammadreza Daroonparvar , Muhamad Azizi Mat Yajid , Hamid Reza Bakhsheshi-Rad , Rajeev Kumar Gupta , A. F. Ismail
Abstract
Single NbSi2 and duplex NbSi2/Nb5Si3 coatings were successfully applied on Nb substrates using halide activated pack cementation (HAPC) method at 1100 and 1300°C, respectively. Duplex NbSi2/Nb5Si3 coating with Nb5Si3 inner barrier layer, higher thickness, and lesser micro-cracks considerably decreased the infiltration of simulated body fluid (SBF) solution. This deduction was pertained to the high corrosion potential and lowest corrosion current density for the NbSi2/Nb5Si3 coated Nb alloy in corrosive solution. The Nb5Si3 inner barrier layer can protect the Nb substrate from corrosive solution when it passes through from NbSi2 top layer. Moreover, higher charge transfer resistance (Rct), impedance modulus at a low-frequency (\(\left| Z \right|\)) and phase angle were also observed for the duplex NbSi2/Nb5Si3 coated Nb alloy. On the other hand, in vitro bioactivity test indicated higher capability of apatite formation on the silicide coatings compared to uncoated Nb substrate in SBF solution. In fact, modification of chemical composition and surface morphology of Nb substrate surface can provide suitable nucleation sites for apatite formation and growth in SBF solution.中文翻译:
Nb基体上单一NbSi 2和NbSi 2 / Nb 5 Si 3双层涂层在生物医学应用中的腐蚀行为和体外生物活性的研究