Oxide Nanolayers Grown on New Ternary Ti Based Alloy Surface by Galvanic Anodizing–Characteristics and Anticorrosive Properties
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Film of new Ti-15Zr-5Nb alloy formed during galvanic anodizing in orthophosphoric acid solution wascharacterized by optical microscope, scanning electron microscope (SEM), energy dispersive spectroscopy(EDS), and Raman micro-spectroscopy. Its anticorrosive properties were determined by electrochemicaltechniques. The film had a layer with nanotube-like porosity with diameters in 500-1000 nm range. Thenano layer contained significant amounts of P and O as well as alloying element. Additionally, Ramanmicro-spectroscopy identified oxygen as oxygen ion in TiO2 anatase and phosphorous as P2O74- ion inphosphotitanate compound. All potentiodynamic polarization curves in artificial Carter-Brugirard saliva withpH values (pH= 3.96, 7.84, and 9.11) depending on the addition of 0.05M NaF revealed nobler behaviorof anodized alloy and higher polarization resistance indicating the film is thicker and more compact nanolayer. Lower corrosion rates of the anodized alloy reduced toxicity due to less released ions into saliva. Biggercurvature radii in Nyquist plot and higher phase angle in Bode plot for the anodized alloy ascertain athicker, more protective, insulating nanolayer existing on the anodized alloy. Additionally, ESI results indicateanodized film consists of an inner, compact, barrier, layer and an outer, less protective, porous layer.
Abstract
Film of new Ti-15Zr-5Nb alloy formed during galvanic anodizing in orthophosphoric acid solution wascharacterized by optical microscope, scanning electron microscope (SEM), energy dispersive spectroscopy(EDS), and Raman micro-spectroscopy. Its anticorrosive properties were determined by electrochemicaltechniques. The film had a layer with nanotube-like porosity with diameters in 500-1000 nm range. Thenano layer contained significant amounts of P and O as well as alloying element. Additionally, Ramanmicro-spectroscopy identified oxygen as oxygen ion in TiO2 anatase and phosphorous as P2O74- ion inphosphotitanate compound. All potentiodynamic polarization curves in artificial Carter-Brugirard saliva withpH values (pH= 3.96, 7.84, and 9.11) depending on the addition of 0.05M NaF revealed nobler behaviorof anodized alloy and higher polarization resistance indicating the film is thicker and more compact nanolayer. Lower corrosion rates of the anodized alloy reduced toxicity due to less released ions into saliva. Biggercurvature radii in Nyquist plot and higher phase angle in Bode plot for the anodized alloy ascertain athicker, more protective, insulating nanolayer existing on the anodized alloy. Additionally, ESI results indicateanodized film consists of an inner, compact, barrier, layer and an outer, less protective, porous layer.
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