Abstract: The present paper aims to investigate the influence of Ni content on the corrosion behavior (in 3.5% NaCl solution) of Al-Cu-Mg alloys whose nominal compositions are Al94.5-xCu4Mg1.5Nix(x=0, 2, 4, 6, 8(wt%)), prepared by the conventional powder metallurgy process. Electrochemical test and weight loss experiment were carried out, and the phase composition, corrosion morphology and selected-area element analysis of the sintered samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS), respectively. The results showed that the sintered samples possessed excellent inter-particle bonding. An intermetallic compound Al3Ni2 can be generated from Ni and Al in the sintering process. Pitting corrosion occurred in the Al-Cu-Mg matrix immersed in 3.5% NaCl solution. Ni addition can raise the corrosion potential of Al-Cu-Mg matrix, inhibit the corrosion current, thus mitigating the materia’s corrosion, and improving the corrosion resistance.
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