“…For simple comparison, one might take the real impedance at which the imaginary part vanishes for the capacitive part to be the charge transfer resistance, and regard it as a measure of corrosion resistance [56,57]. Thus, good corrosion resistance can be attributed to the high charge transfer resistance (or large dimension of the Nyquist plot) [57]. In this regard, R t of the bare Mg alloy was estimated to be 0.441 kU cm 2 which is worst corrosion resistance among the three samples.…”
“…For simple comparison, one might take the real impedance at which the imaginary part vanishes for the capacitive part to be the charge transfer resistance, and regard it as a measure of corrosion resistance [56,57]. Thus, good corrosion resistance can be attributed to the high charge transfer resistance (or large dimension of the Nyquist plot) [57]. In this regard, R t of the bare Mg alloy was estimated to be 0.441 kU cm 2 which is worst corrosion resistance among the three samples.…”
“…Generally, the dissolution rate of Mg 2+ ions corresponds the anodic current density, while the reduction rate of water is hydrogen evolution reaction corresponds to the cathodic current density [32].…”
Section: Polarization and Impedance Behaviormentioning
Mg matrix in situ composites were fabricated from Mg and ZnO powder by a spark plasma sintering method. The composition and microstructure of the sintered samples were characterized. Corrosion properties of fabricated composites were evaluated by immersion and by electrochemical tests using Hanks' solution. The results showed that the formation of in situ products improved significantly the corrosion resistance of the fabricated composites compared with pure Mg; Mg-10 wt % ZnO composites especially exhibited the lowest corrosion rate. In addition, an energy-dispersive X-ray (EDX) analysis showed that calcium phosphate formed as a corrosion product on the surface of Mg-10 wt % ZnO composites, while Mg(OH)2 appeared as a corrosion product on the surface of Mg-20 wt % ZnO composite. The findings suggested Mg-10 wt % ZnO composite as a potential candidate for temporary implant application.
“…The Ti 2p peak at a binding energy of ~458.8 eV corresponded to the presence of TiO 2 nanopowders [30,48] within the MHT5, MHT10 and MHT15 samples. In addition, the Ti 2p peaks can be attributed to the MgTiO 3 phase and/or Ti that is released by reaction (3) [51]. The anodic and cathodic reactions can be written as follows:…”
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