Authors: Arash Fattahalhosseini Omid Imantalab Farid Reza Attarzadeh Navid Attarzadeh
Publish Date: 2017/03/13
Volume: 26, Issue: 4, Pages: 1634-1646
Abstract
Electrochemical properties of coarse and nanograined pure copper can be modified and improved effectively through applying cyclic potentiodynamic passivation CPP treatment It is found that the success of this method depends up to a large extent on grain size Eight passes of accumulative roll bonding processing are successfully used at room temperature to produce nanograined pure copper Transmission electron microscopy image and selected area diffraction pattern both attest to the occurrence of intense grain refinement under the influence of aforementioned process in which an average grain size 100 nm is attainable Using several electrochemical characterization methods reveals that CPP treatment fully exploits potentials of nanograined samples to form a dense and thick protective passive film It is speculated that highquality passive layers relate to the presence of highdensity structural defects on the surface of nanograined samples
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