| 引用本文: | 谢瑞祥,刘宗德,马荷蓉,李珏縯,齐英男.铝合金表面激光熔覆铜镍合金涂层的组织、硬度与耐蚀特性研究[J].材料科学与工艺,2023,31(6):78-86.DOI:10.11951/j.issn.1005-0299.20220303. |
| XIE Ruixiang,LIU Zongde,MA Herong,LI Jueyan,QI Yingnan.Microstructure, hardness and corrosion resistance of laser cladding copper-nickel alloy coating on aluminum alloy[J].Materials Science and Technology,2023,31(6):78-86.DOI:10.11951/j.issn.1005-0299.20220303. |
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| 摘要: |
| 为提升铝合金材料的耐蚀性能,探究铝合金与合金熔覆层间的结合机理,本文利用激光熔覆技术在5083铝合金表面制备了不同Ni含量的铜镍合金熔覆层,并利用扫描电子显微镜、X射线衍射分析、硬度测试与电化学性能测试技术,分析了不同Ni含量的铜镍合金熔覆层相组成与组织形貌、铜镍合金熔覆层与铝合金基体的界面组织形貌,绘制了铝元素扩散曲线,分析了海水腐蚀过程中铜镍合金熔覆层的极化曲线。实验结果表明:所制备的铜镍合金熔覆层形貌良好无缺陷,熔覆层由网络状枝晶组成。对合金熔覆层进行XRD分析发现熔覆层主要由AlNi3与CuNi两相组成。结合SEM、EDS分析,发现合金熔覆层的网络状枝晶为富铝相,即AlNi3,晶间相为CuNi相。在硬度测试中,由于AlNi3硬质相的生成,熔覆层硬度得到了提升且随着铝的向上扩散呈现一定的规律,电化学检测结果表明,铜镍合金熔覆层具有比5083铝合金更高的自腐蚀电位和较小的自腐蚀电流密度,可以有效提升5083铝合金在海水环境中的耐蚀性。 |
| 关键词: 铝合金 铜镍合金 激光熔覆 相组成 界面 |
| DOI：10.11951/j.issn.1005-0299.20220303 |
| 分类号:TG17 |
| 文献标识码:A |
| 基金项目: |
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| Microstructure, hardness and corrosion resistance of laser cladding copper-nickel alloy coating on aluminum alloy |
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XIE Ruixiang, LIU Zongde, MA Herong, LI Jueyan, QI Yingnan
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(School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 100083, China)
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| Abstract: |
| In order to improve the corrosion resistance of aluminum alloy materials and explore the bonding mechanism between aluminum alloy and alloy cladding layers, copper-nickel alloy cladding layers with different Ni contents were prepared on the surface of 5083 aluminum alloy by laser cladding technology. Using scanning electron microscopy, X-ray diffraction analysis, hardness test and electrochemical performance test techniques, the phase composition and microstructure morphology of copper-nickel alloy cladding layers with different Ni contents and the interfacial microstructure morphology of copper-nickel alloy cladding layers and aluminum alloy matrix were analyzed, the aluminum diffusion curve was drawn and the polarization curve of copper-nickel alloy cladding layers during seawater corrosion was analyzed. The experimental results show that the prepared Cu-Ni alloy cladding layer has good morphology and no defects. The cladding layer is composed of network dendrites. The XRD analysis shows that the cladding layer is mainly composed of AlNi3 and CuNi phases. Combined with SEM and EDS analysis, it is found that the network dendrites of the alloy cladding layer are AlNi3 rich phase and CuNi phase. In the hardness test, due to the formation of AlNi3 hard phase, the hardness of cladding layer is increased and presents a certain rule with the upward diffusion of aluminum. The electrochemical test results show that the Cu-Ni alloy cladding layer has higher self-corrosion potential and lower self-corrosion current density than 5083 aluminum alloy, which can effectively improve the corrosion resistance of 5083 aluminum alloy in seawater environment. |
| Key words: Al alloy Cu-Ni alloy laser cladding phase composition interface |
