添加Ni对激光熔覆CuAl10铜合金组织与性能的影响

Influence of Ni Additions on the Microstructures and Properties of Laser Clad Cu Al10 Coatings

为进一步提高Cu Al10合金激光熔覆层的耐蚀性能,研究添加不同质量分数的Ni对Cu Al10熔覆层组织及性能的影响。采用HPDL-D30半导体激光设备,用同步送粉的方式在316L不锈钢基体表面进行激光熔覆。借助扫描电子显微镜(SEM)、能谱仪(EDS)、X射线衍射(XRD)对激光熔覆层进行组织、成分及物相分析,并使用显微硬度计进行硬度分析和电化学工作站进行耐蚀性能分析。研究结果表明:添加Ni元素的铜合金熔覆层与基体金属冶金结合,组织分布均匀;添加Ni能显著提高激光熔覆层的耐蚀性能,随着Ni含量的增加,其耐蚀性呈增强趋势,Ni质量分数为6.0%时,耐蚀性能达到最优;未添加Ni元素的熔覆层物相主要以α-Cu,α-Fe,Al Fe3,Cu9Al4组成,添加Ni元素的熔覆层物相主要由α-Cu,α-(Cu,Ni),Al Cu3,Cu9Al4组成。

To further improve the corrosion resistance performance of Cu Al10 alloy laser cladding coating, the influence of Ni additions on the microstructures and properties of Cu Al10 coatings produced by laser cladding is investigated. Laser cladding is performed on 316 L stainless steel surface by a HPDL-D30 diode laser with direct injection powders. Laser cladding coatings are characterized by scanning electron microscopy（SEM）, energy dispersive X-ray spectroscopy（EDS）, X-ray diffraction（XRD） and microhardness tester. The electrochemical corrosion behavior of cladding layers is evaluated. The results show that the coating have an excellent metallurgical bonding with the substrate and homogeneous microstructure. The addition of Ni element can significantly improve the corrosion resistance performance of laser cladding coatings. The corrosion resistance of claddings increase with increasing the mass fraction of Ni, reaching a maximum at 6.0%. The cladding without Ni mainly consists of α- Cu,α- Fe, Al Fe3 and Cu9Al4, while the addition of Ni element cladding mainly consists of α- Cu, α-（Cu,Ni）, Al Cu3 and Cu9Al4.