激光熔覆Al3Ti金属间化合物涂层的腐蚀及耐磨性能研究
Study on Corrosion and Wear Resistance of Al3Ti Intermetallic Compounds Coating Prepared by Laser Cladding
杨智成, 王国华, 何 欢, 符跃春
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作者单位：(广西大学 材料科学与工程学院, 有色金属及材料加工新技术教育部重点实验室, 广西 南宁 530004)
中文关键字：激光熔覆； 铝合金； Al3Ti； 电化学腐蚀； 磨损
英文关键字：laser cladding; aluminum alloy; Al3Ti; electrochemical corrosion; wear
中文摘要：采用5 kW横流CO2激光器在AA6063铝合金表面激光熔覆Al3Ti金属间化合物涂层，研究了熔覆层的显微组织、电化学腐蚀和摩擦磨损性能。结果表明，熔覆层由树枝晶Al3Ti和枝晶间α-Al两相组成，并与基材形成良好的冶金结合。熔覆层在w(NaCl)=3.5%溶液中发生钝化，腐蚀电流密度约为基材的1/10；在载荷10 N、摩擦距离800 m时，熔覆层的磨损质量损失低于基材的1/2，说明Al3Ti金属间化合物涂层显著提高了基材的耐腐蚀和耐磨损性能。
英文摘要：Al3Ti intermetallic compound coating was laser cladded on AA6063 aluminum alloy by 5 kW transverse CO2 laser processing system. The microstructure, electrochemical corrosion and wear resistance behaviors were investigated. The results show that, the laser cladding coating is made up of dendrites Al3Ti and interdendrites α-Al, and has good bonding with the substrate. The coating passivated in 3.5%NaCl solution shows a one-tenth corrosion current density compared with that of the substrate. The wear mass loss of the coating is about one-half lower than that of the substrate under the condition of 10 N load and 800 m sliding distance. All the results indicate that Al3Ti intermetallic compound coating greatly increase the corrosion and wear resistance of the substrate.