Electrochemical Behavior of Cu-Al-Ni Alloy in Simulated Body Fluids

Rabab M. El-Sherif

Biomaterials, Corrosion, Cu-Al-Ni alloy, impedance, Polarization, SEM.

The electrochemical comparative studies between, Cu-Al-Ni alloy as a non-precious casting alloy and a pure Ti as a common biomaterial were investigated in simulated body fluid (SBF). The aim of the work was to evaluate the corrosion resistivity of these alloys in the simulated body fluids, using electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization measurements. The surface morphology of the alloys was examined via the scanning electron microscopy. This comparison was focused on the effect of the solution chemistry and immersion time on the passivity of the alloys. The influence of albumin, as a model protein, and a fluoride ion with its simulated dose in a human body, on both biomaterials was investigated. The Albumin has enhanced the corrosion resistance of both samples. On the contrary, fluoride ion increased their corrosion rate in all the tested solutions. The electrochemical behavior of Ti has shown a higher transfer resistance and a lower capacitance compared with the copper alloy. However, the resistivity of both materials increased with immersion time in the different solutions.

10.22161/ijaers/3.11.29