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为了提高6061铝合金材料的表面性能,利用激光熔覆技术在6061铝合金表面制备了添加有稀土CeO2的Ni60合金熔覆层。分析了激光熔覆稀土CeO2+Ni60熔覆层的显微组织及硬度,研究了其耐腐蚀性能,并与Ni60合金熔覆层和6061铝合金基体进行了对比研究。结果表明,加入2%的稀土氧化物CeO2可有效地减少熔覆层中的裂纹、孔洞和夹杂物,促进晶粒细化,提高熔覆层的组织均匀性、表面硬度及耐腐蚀性能;电化学腐蚀测试表明,在1 mol/L H2SO4中,Ni60熔覆层、铝合金基体的自腐蚀电流密度分别是CeO2+Ni60熔覆层的1.67倍和76.6倍;在3.5%NaCl溶液中,Ni60熔覆层、铝合金基体的自腐蚀电流密度分别是CeO2+Ni60熔覆层的1.6倍和44.5倍;在1 mol/L NaOH溶液中,Ni60熔覆层、铝合金基体的自腐蚀电流密度分别是CeO2+Ni60熔覆层的1.3倍和81倍。
In order to improve the surface properties of 6061 aluminum alloy, the laser cladding technology was used to prepare the Ni60 alloy cladding layer with 60% CeO2 addition on the surface of 6061 aluminum alloy. The microstructure and hardness of the cladding layer of laser cladding rare earth CeO2 + Ni60 were analyzed. The corrosion resistance of the cladding layer was studied. The comparative study was carried out with Ni60 alloy cladding layer and 6061 aluminum alloy substrate. The results show that adding 2% rare earth oxide CeO2 can effectively reduce the cracks, holes and inclusions in the cladding layer, promote the grain refinement and improve the microstructure uniformity, surface hardness and corrosion resistance of the cladding layer. The chemical corrosion tests showed that the self-corrosion current density of Ni60 cladding layer and aluminum alloy substrate was 1.67 times and 76.6 times that of CeO2 + Ni60 cladding layer respectively in 1 mol / L H2SO4. In 3.5% NaCl solution, Ni60 melt The self-corrosion current density of the cladding and the aluminum alloy substrate is respectively 1.6 times and 44.5 times that of the CeO2 + Ni60 cladding layer. In 1 mol / L NaOH solution, the self-corrosion current density of the Ni60 cladding layer and the aluminum alloy substrate is CeO2 + Ni60 cladding 1.3 times and 81 times.