Surface corrosion of Ni-Cr alloys in artificial saliva with xilina and cloramphenicol

Abstract

Two non-precious Ni-Cr-Mo based alloys were analyzed with respect to their corrosion behaviour. The main parameters of the corrosion process were evaluated from linear potentiodynamic polarization curves, in Afnor type artificial saliva with added xilina / cloramphenicol. The contact time between the alloy and the corrosive medium influenced the corrosion rate as the corrosion current values decreased with the contact time due to passivation phenomena. The microscopic analysis of the alloy surfaces showed that the passivation processus in the tested solution did not modify the type of the corrosion process. The present investigation results showed that both alloys were susceptible to localized corrosion.