Corrosion behavior of orthodontic wires in artificial saliva with presence of beverage

Abstract Corrosion resistance of Ni-Ti alloy, 22 carat gold, SS 18/8 alloy, SS316L alloy, and thermoactive alloy in artificial saliva (AS) in the absence and presence of tea has been evaluated by polarization study, AC impedance spectra, UV-visible absorption and fluorescence spectra, SEM, AFM, and EDAX. For Ni-Ti alloy, 22 carat gold, SS 18/8 alloy, SS316L alloy, and thermoactive alloy, polarization study and AC impedance spectra lead to the result that the Ni-Ti alloy has more corrosion resistance. The decreasing order of the corrosion resistance for Ni-Ti alloy is AS + tea > AS > tea. People fixed with orthodontic wire, made of Ni-Ti alloy, can take tea orally without any hesitation. Linear polarization resistance, corrosion current, charge transfer resistance, double-layer capacitance, and impedance were utilized to evaluate the corrosion inhibition of the tea. UV-visible absorption spectroscopy (UV), fluorescence spectroscopy, scanning electron microscopic (SEM) studies, electron-dispersive X-ray spectroscopy (EDAX), and atomic force microscopy (AFM) give the evidence of better surface condition of the orthodontic wire.