摘要
采用激光熔覆技术于TC4表面制备了Ti-Al-(C, N)复合涂层,利用电化学工作站与摩擦磨损试验机对TC4与复合涂层在模拟海水环境中的电化学性能以及摩擦磨损性能进行测试,探究复合涂层在模拟海水环境中的腐蚀、磨损机理。结果表明:复合涂层的自腐蚀电位为-0.14 V,腐蚀电流密度为9.75×10^(-8) A/cm^(2),表现出良好的耐腐蚀性能;在为期30 d的浸泡过程中,复合涂层与TC4表面钝化膜均会因腐蚀性离子的吸附而被破坏,造成表面钝化膜阻抗逐渐降低;均匀而致密的复合涂层相比TC4具有更好的减摩耐磨性,其平均摩擦因数为0.28,磨损机制主要表现为磨粒磨损和少量黏着磨损,磨损体积较TC4减少15.2%。
Ti-Al-(C,N)composite coatings were prepared in this study using laser cladding on TC4 substrate.The electrochemical properties and friction and wear properties of the coating in simulated seawater environment were tested by electrochemical workstation and friction and wear tester,and the corrosion and wear mechanisms of the coating in simulated seawater environment were explored.The results show that the reinforcement particles of the composite coating can effectively reduce the corrosion reaction area of the substrate and prolong the path of corrosive ion diffusion into the material.The self-corrosion potential of the composite coating is−0.14 V,and the corrosion current density is 9.75×10^(−8) A/cm^(2),showing excellent corrosion resistance.In the process of immersion for 30 days,the composite coating and passive film on TC4 surface will diffuse through the inherent defects of the material surface due to the adsorption of corrosive ions,resulting in the ability of passive film to block the invasion of external corrosive ions and the charge transfer at the interface double layer gradually weakened.The uniform and dense composite coating has better friction reduction performance than TC4,and its average friction coefficient is only 0.28.The wear mechanism of composite coating is mainly abrasive wear and a small amount of adhesive wear,the total volume loss is 15.2%lower than that of TC4.
作者
冯进宇
肖华强
任丽蓉
肖易
田雨鑫
周璇
FENG Jin-yu;XIAO Hua-qiang;REN Li-rong;XIAO Yi;TIAN Yu-xin;ZHOU Xuan(School of Mechanical Engineering,Guizhou University,Guiyang 550025,China;School of Mechatronics Engineering,Guizhou Minzu University,Guiyang 550025,China)
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2023年第4期1220-1231,共12页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目(52065009)
贵州省科技计划资助项目(QKHJC-ZK[2022]-204)
贵阳市科技计划资助项目(ZKHT-[2021]-1-4)
国家重点研发计划资助项目(SQ2020YFF0421630)。
关键词
激光技术
MAX相
复合涂层
耐蚀性
耐磨性
laser technology
MAX phase
composite coating
corrosion resistance
wear resistance
