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.%通过常规粉末冶金工艺制备了Al94.5-xCu4Mg1.5Nix(x=0、2、4、6、8(％,质量分数))试样,研究了不同Ni含量试样在3.5％ NaCl溶液中的耐腐蚀性能.利用X射线衍射(XRD)技术分析了试样烧结后的物相组成,通过电化学实验和失重腐蚀实验分析得到了试样的腐蚀数据,利用扫描电子显微镜(SEM)观察了试样的腐蚀形貌,并通过能谱仪(EDS)进行了微区成分分析.研究结果表明:烧结反应进行良好,Ni在烧结过程中可与Al反应生成金属间化舍物Al3Ni2,铝基体在3.5％ NaCl溶液中发生点蚀腐蚀,Ni的加入能够提高铝基体的腐蚀电位,减小腐蚀电流,使得基体的腐蚀程度减轻,材料的耐腐蚀性能提高.
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