Journal of Materials Research and Technology Journal of Materials Research and Technology
J Mater Res Technol 2018;7:223-30 DOI: 10.1016/j.jmrt.2017.07.003
Original Article
Corrosion behaviour of Ti–Ni–Al alloys in a simulated human body solution
Mara Jetzabet Garcia-Ramireza, Roy Lopez-Sesenesb, Isai Rosales-Cadenaa, Jose Gonzalo Gonzalez-Rodrigueza,,
a Uiversidad Autonoma del Esatdo de Morelos, CIICAp, Av. Universidad 1001, Col. Chamilpa, 62209-Cuernavaca., Mor., Mexico
b Uiversidad Autonoma del Esatdo de Morelos, Facultad de Ciencias Quimicas e Ingenieria, Av. Universidad 1001, Col. Chamilpa, 62209-Cuernavaca., Mor., Mexico
Received 03 February 2017, Accepted 06 July 2017
Abstract

The effect of Al additions (5, 10, 15 and 20at.%) on the corrosion behaviour of a 50at.% Ti–50Ni alloy in Hank solution has been investigated by using potentiodynamic polarization curves, electrochemical impedance spectroscopy (EIS), electrochemical noise (EN) and linear polarization resistance (LPR) measurements. Microstructure evolution was observed from columnar grains to equiaxed grains in samples with low and high Al additions, respectively. All the different techniques indicated that with the addition of either 5 or 10at.% Al not only decreases the uniform corrosion rate, but also the susceptibility to pitting corrosion. EIS technique has shown that the corrosion resistance of these alloys is due to a TiO2 layer with a duplex structure. Results have been explained in terms of the difference in microstructures for the different alloys.

Keywords
TiNiAl alloy, Hank solution, Chloride corrosion
J Mater Res Technol 2018;7:223-30 DOI: 10.1016/j.jmrt.2017.07.003
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