摘要
以37Mn5钢作为测试基材,利用选择性激光熔化(selective laser melting, SLM)工艺在基体表面制备WC/Co涂层,以恒电位方法测试了海水介质下的磨蚀性能。研究结果表明:WC/Co涂层产生(111)、(200)和(311)各晶面对应衍射峰。WC/Co涂层厚度约3μm,形成较粗糙的表面结构,在载荷作用下发生划伤现象。当载荷为5 N时,极化曲线往右下角偏移,腐蚀电位也明显提高,得到更小的腐蚀电流密度,阳极区电流密度明显波动。提高阳极电位后,钝化膜已被击穿并产生了微孔,导致电流明显提高。当WC/Co涂层电位升高后,摩擦因数提高,引起涂层腐蚀现象,磨损量增加。电位0.5 V时涂层已经发生了磨穿,形成了大量点蚀形态凹坑结构,出现了划伤的犁沟,磨痕边界也发生了少数剥落。
The WC/Co coating was deposited on the surface of 37 Mn5 steel by selective laser melting(SLM). The wear resistance of WC/Co coating was tested by potentiostatic method, and the electrochemical corrosion performance was tested by seawater as medium. Results show that WC/Co coating produces diffraction peaks corresponding to(111),(200) and(311) crystal faces. The thickness of WC/Co coating is about 3 μm, which forms a rough surface structure, and scratches occur under the action of load. When the load is 5 N, the polarization curve shifts to the lower right corner, the corrosion potential also increases significantly, the corrosion current density is smaller, and the current density in the anode region significantly fluctuates. After increasing the anode potential, the passivation film has been broken down and produced microholes, resulting in a significant increase in current. When the potential of WC/Co coating increases, the friction coefficient increases, which leads to the corrosion of the coating and the increasement of wear amount. When the potential is 0.5 V, the coating has been worn through, forming a large number of pitting pit structures, scratching furrows, and a few peeling occurred at the boundary of the wear mark.
作者
刘永利
李峰
朱超
田景辉
陈玉英
朱永梅
Liu Yongli;Li Feng;Zhu Chao;Tian Jinghui;Chen Yuying;Zhu Yongmei(Hebei Taiheng Safety Evaluation Consulting Co.,Ltd.,Shijiazhuang,Hebei 050010,China;School of Materials Science and Engineering,North China University of Science and Technology,Tangshan,Hebei 063007,China)
出处
《应用激光》
CSCD
北大核心
2022年第4期113-118,共6页
Applied Laser
基金
国家自然科学基金(51775157)。
