TC4钛合金表面激光熔覆工艺的PLC控制与组织性能研究  

Research on laser cladding of nickel based coatings on TC4 titanium alloy surface and its microstructure&properties based on PLC control

作　　者：姚玉梅[1] 张育红 李恒[3] 邢峰 Yao Yumei;Zhang Yuhong;Li Heng;Xing Feng(Henan Mechanical and Electrical Vocational College,Zhengzhou 451191,China;Zhejiang NARADA Power Source Co.,Ltd.,Hangzhou 311300,China;Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]河南机电职业学院,河南郑州451191 [2]浙江南都电源动力股份有限公司,浙江杭州311300 [3]郑州大学,河南郑州450001

出　　处：《电镀与精饰》2024年第11期1-8,共8页Plating & Finishing

基　　金：河南省科技攻关计划项目(222102210416);河南省自然科学基金项目(411063117)。

摘　　要：为了提升钛合金的表面耐磨性和耐蚀性,基于可编程逻辑控制器(PLC)控制激光工艺参数在TC4钛合金表面制备了镍基涂层,研究了激光功率对涂层形貌、物相组成、硬度、耐磨性和耐蚀性的影响。结果表明,激光功率为1100 W和2300 W时熔覆涂层中存在裂纹、孔隙缺陷,在激光功率为1400 W~2000 W时激光熔覆涂层质量较好。不同激光功率下激光熔覆涂层均主要由α-Ti、Ti Ni、Ti_(2)Ni、Ti B_(2)、Ti C和Ce_(2)O_(3)相组成,激光功率的变化不会改变激光熔覆涂层的物相组成。激光熔覆涂层的显微硬度(935.61 HV~1064.29 HV)都高于基体(303.24 HV),磨损率都明显小于基体材料;当激光功率从1100 W增加至2300 W时,激光熔覆涂层的显微硬度先增后减、磨损率先减后增,显微硬度最大值(1064.29 HV)和磨损率最小值(0.38×10^(-5) mm^(3)·N^(-1)·m^(-1))在激光功率为2000 W时获得。极化曲线和电化学阻抗谱的测试结果相吻合,证明激光熔覆涂层的耐蚀性都优于基体,且耐蚀性会随着激光功率增加先增大后减小,激光功率为2000 W时涂层耐蚀性最好。In order to improve the surface wear resistance and corrosion resistance of titanium alloy,a nickel based coating was prepared on TC4 titanium alloy surface using programmable logic controller(PLC)controlled laser process parameters.The effect of laser power on coating morphology,phase composition,hardness,wear resistance and corrosion resistance was studied.The results indicate that there are cracks and pore defects in the cladding coating when the laser power is 1100 W and 2300 W,and the forming quality of the laser cladding coating is better when the laser power is between 1400 W and 2000 W.The laser cladding coatings under different laser powers are mainly composed ofα-Ti,TiNi,Ti2Ni,TiB2,TiC,and Ce_(2)O_(3),the phase composition does not change with changes in laser power.The microhardness of the laser cladding coating(935.61 HV‒1064.29 HV)is higher than that of the substrate(303.24 HV),and the wear rate is significantly lower than that of the substrate material;When the laser power increases from 1100 W to 2300 W,the microhardness of the laser cladding coating first increases and then decreases,and the wear first decreases and then increases.The maximum microhardness(1064.29 HV)and the minimum wear rate(0.38×10^(-5) mm^(3)·N^(-1)·m^(-1))are obtained at a laser power of 2000 W.The polarization curve and electrochemical impedance spectrosco‐py test results are consistent,indicating that the corrosion resistance of the laser cladding coating is bet‐ter than that of the substrate,and the corrosion resistance first increases and then decreases with the increase of laser power.The coating has the best corrosion resistance when the laser power is 2000 W.

关 键 词：激光熔覆 镍基涂层 激光功率 硬度 耐磨性 耐蚀性 

分 类 号：TG174.4[金属学及工艺—金属表面处理]