中文摘要：

利用激光增材制造技术,在6063Al基体表面制备了添加不同含量CeO2的Ni60合金层,并通过金相显微镜、XRD、SEM和电化学腐蚀测试仪等设备进行了分析和测试,研究稀土CeO2对6063Al表面激光增材制造镍基合金层与基体结合界面处的组织结构及耐腐蚀性能的影响。结果表明,在表面形貌上,4%-5%CeO2（质量分数,下同）的合金层形貌最好,CeO2含量低于3%时难以获得表面良好的合金层,CeO2含量在5%-10%时,合金层表面气孔、脱落等缺陷较少;在截面形貌上,合金层中CeO2含量在0%-2%时易出现裂纹,含量在5%-10%时主要缺陷为气孔,4%CeO2＋Ni60合金层中无明显气孔和裂纹,具有相对较好的截面形貌;添加4%CeO2可以改善Ni60合金层的组织结构,促进合金层的晶粒细化和组织分布均匀;添加不同含量CeO2可以改善铝合金表面Ni60合金层的组织形貌,较佳的稀土添加量是4%CeO2;在1 mol/L H2SO4中,CeO2＋Ni60合金层的耐腐蚀性能是Ni60合金层的4.23倍;在3.5%Na Cl溶液中,CeO2＋Ni60合金层耐腐蚀性能是Ni60合金层的1.43倍;在1 mol/L Na OH溶液中,CeO2＋Ni60合金层的耐腐蚀性是Ni60合金层的1.42倍。

英文摘要：

Ni60 alloy layers with different contents of rare-earth CeO2 were prepared on the surface of 6063 aluminum alloy by laser additive manufacturing. The effects of rare earth CeO2 addition on microstructure, phase structure and corrosion resistance of bonding interface between Ni60-CeO2 alloy layers and substrate were investigated by OM, XRD, SEM and electrochemical corrosion tester. Results show that 4%-5% CeO2＋Ni60 alloy layers have the best surface morphology. It is difficult to obtain a good alloy layer when the CeO2 content is less than 3%. There are less surface pores, shedding and other defects when CeO2 content is between 5% and 10%. For the cross-section morphology, the alloy layers are prone to crack when the CeO2 content is between 0% and 2%. The main defect is porosity when the content is from 5% to 10%. The 4% CeO2＋Ni60 alloy layer has no obvious pores and cracks, with a relatively good cross-section morphology. Adding 4% CeO2 can improve the organizational structure of Ni60 alloy layer, promote grain refinement and uniform structure distribution. Adding different contents of CeO2 can improve aluminum surface morphology in Ni60 alloy layers, and the preferred amount of rare earth CeO2 is 4% CeO2. Electrochemical corrosion tests show that the corrosion resistance of CeO2＋Ni60 alloy layer is 4.23 times as that of Ni60 alloy layer in 1 mol/L H2SO4 solution. In 3.5% Na Cl solution, the corrosion resistance of CeO2＋Ni60 alloy layer is 1.43 times as that of Ni60 alloy layer. In 1 mol/L Na OH solution, the corrosion resistance of CeO2＋Ni60 alloy layer is 1.42 times as that of Ni60 alloy layer.