A Review on the Passive Behavior of Ultrafine–grained Aluminum, Copper, and Titanium made using Accumulative Roll Bonding Process

Grain size effect on corrosion general trends was clarified by Ralston and Birbiliś ́s review by sorting them with three different corrosion status (active, passive, and active/passive) having diverse potentiodynamic polarization curves. The active type made them realize that finer grain size showed an acceleration in corrosion currents whereas the passive type had a totally opposite trend. A mixed type of the prior two types being lower in the passive zone and the active zone of higher was indicated within the active/passive type. There is a big problem whether these attitudes retain in submicron size- or nano-scale grain size. Ultrafine–grained (UFG) materials have drawn remarkable attention through twenty years ago. Several severe plastic deformation (SPD) processes have been applied in order to make UFG materials in which the accumulative roll bonding (ARB) procedure is the most effective one among them. Structure of UFG divulges an advancement in mechanical properties along with distinct corrosion behavior, but not always resulting in better corrosion resistance. Diverse relevant work is reviewed in this paper in order to date the studied passive behavior of UFG aluminum, copper, and titanium, having produced utilizing ARB procedure. In this study, the grain size effect using ARB procedure on passive behavior of aluminum, copper, and titanium has been evaluated in related passive environments using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) methods.