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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CeO_2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CeO_2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%CeO_2(质量分数,下同)的合金层形貌最好,CeO_2含量低于3%时难以获得表面良好的合金层,CeO_2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CeO_2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%CeO_2+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%CeO_2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CeO_2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%CeO_2;在1 mol/L H2SO4中,CeO_2+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,CeO_2+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,CeO_2+Ni60合金层的耐腐蚀性是Ni60合金层的1.42倍。
Using laser additive manufacturing technology, Ni60 alloy layer with different CeO_2 content was prepared on the surface of 6063Al substrate. The metallographic microscope, XRD, SEM and electrochemical corrosion tester were used to analyze and test the effect of rare earth CeO_2 on 6063Al Effect of Surface Laser Additives on Microstructure and Corrosion Resistance at the Bonding Interface between Nickel Base Alloy and Matrix. The results show that the morphology of 4% ~ 5% CeO_2 (mass fraction, the same below) alloy layer is the best on the surface morphology, and it is difficult to obtain a good surface alloy layer when the CeO_2 content is less than 3% ~ 10%, there are few defects such as stomata and exfoliation on the surface of the alloy layer. Cracks easily occur when the content of CeO 2 in the alloy layer is 0% ~ 2% on the cross-sectional morphology. The main defects are pores when the content is 5% ~ 10% , 4% CeO_2 + Ni60 alloy layer without obvious pores and cracks, with relatively good cross-section morphology; addition of 4% CeO_2 Ni60 alloy layer can improve the microstructure and promote the alloy layer grain refinement and organizational uniformity; The addition of CeO 2 can improve the microstructure of Ni60 alloy on the surface of aluminum alloy. The best REE content is 4% CeO 2. In 1 mol / L H2SO4, the corrosion resistance of CeO_2 + Ni60 alloy is that of Ni60 alloy 4.23 times. In 3.5% NaCl solution, the corrosion resistance of CeO_2 + Ni60 alloy layer is 1.43 times that of Ni60 alloy layer. In 1 mol / L NaOH solution, the corrosion resistance of CeO_2 + Ni60 alloy layer is Ni60 alloy layer 1.42 times.