Surface Protection Obtained by Anodic Oxidation of New Ti-Ta-Zr Alloy
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A new 80Ti-15Ta-5Zr wt% alloy surface was protected by anodic oxidation in phosphoric acid solution. The protective oxide layer (TiO2, ZrO2 and Ta suboxides and thickness of 15.5 nm) incorporated PO43-ions from the solution, according to high resolution XPS spectra. The AFM analysis determined ahigh roughness with SEM detected pores (20 - 50 nm). The electrochemical studies of bare and anodicallyoxidized Ti-15Ta-5Zr alloy in Carter-Brugirard saliva of different pH values and saliva with 0.05MNaF, pointed to a nobler surface for the protected alloy, with a thicker electrodeposited oxide layeracting as a barrier against aggressive ions. The oxidized alloy significantly decreased corrosion currentdensities and total quantity of ions released into the oral environment in comparison with the bareone, at higher polarisation resistance and protective capacity of the electrodeposited layer. The impedancedata revealed a bi-layered oxidation film formed by: a dense, compact, barrier layer in contact withthe metallic substrate, decreasing the potential gradient across the metal/oxide layer/solution interface,reducing the anodic dissolution and a more permissive, porous layer in contact with the electrolyte. The open circuit potential for protected alloy shifted to nobler values, with thickening of the oxidationfilm signifying long-term protection.
Abstract
A new 80Ti-15Ta-5Zr wt% alloy surface was protected by anodic oxidation in phosphoric acid solution. The protective oxide layer (TiO2, ZrO2 and Ta suboxides and thickness of 15.5 nm) incorporated PO43-ions from the solution, according to high resolution XPS spectra. The AFM analysis determined ahigh roughness with SEM detected pores (20 - 50 nm). The electrochemical studies of bare and anodicallyoxidized Ti-15Ta-5Zr alloy in Carter-Brugirard saliva of different pH values and saliva with 0.05MNaF, pointed to a nobler surface for the protected alloy, with a thicker electrodeposited oxide layeracting as a barrier against aggressive ions. The oxidized alloy significantly decreased corrosion currentdensities and total quantity of ions released into the oral environment in comparison with the bareone, at higher polarisation resistance and protective capacity of the electrodeposited layer. The impedancedata revealed a bi-layered oxidation film formed by: a dense, compact, barrier layer in contact withthe metallic substrate, decreasing the potential gradient across the metal/oxide layer/solution interface,reducing the anodic dissolution and a more permissive, porous layer in contact with the electrolyte. The open circuit potential for protected alloy shifted to nobler values, with thickening of the oxidationfilm signifying long-term protection.
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