摘要
为了研究不同功率超声频率及其作用方式对复合电沉积层组织结构及性能的影响规律,采用功率超声辅助电沉积在合金钢表面制备了纳米镍基金属陶瓷复合层,通过形貌及组织结构观察硬度及电化学行为测试等手段研究了不同功率超声频率及其作用方式对复合电沉积层组织结构及性能的影响规律。结果表明:采用功率超声(超声频率为45 kHz与80 kHz,作用方式为20 s∶10 s)辅助电沉积获得的纳米金属陶瓷复合沉积层表面均匀致密,纳米镍晶粒择优取向为低表面能的(111)密排面,晶粒直径小于30 nm,纳米氮化钛粒子在沉积层中均匀分布,沉积层表面硬度提高2倍以上,沉积层结合强度为203.71 MPa,沉积层腐蚀电流密度较基体降低1个数量级。通过改变功率超声频率可以有效减少纳米金属陶瓷粒子团聚,制备出具有良好综合性能的纳米复合电沉积层。
In order to study the influence of different power ultrasonic frequencies and their modes of action on the structure and properties of the composite electrodeposited layer,a nano nickel-based cermet composite layer was prepared on the surface of alloy steel by power ultrasonic assisted electrodeposition.The effects of different power ultrasonic frequencies and their modes of action on the structure and properties of the composite electrodeposited layer were studied by means of morphology and structure observation,hardness and electrochemical behavior test.Results showed that the surface of the nano cermet composite deposition layer obtained by auxiliary electrodeposition using power ultrasound(ultrasonic frequency:45 kHz and 80 kHz,and the mode of action:20 s and 10 s)was uniform and compact,and the preferred orientation of nano-nickel grains was low-surface-energy(111)close-packed surface,the grain diameter was less than 30 nm,nano titanium nitride particles were uniformly distributed in the deposition layer,the surface hardness of the deposition layer increased by more than 2 times,the bonding strength of the deposition layer was 203.71 MPa,and the corrosion current density of the deposition layer was lower than that of the substrate by one order of magnitude.By changing the power ultrasonic frequency,the agglomeration of nano cermet particles could be effectively reduced,and a nano composite electrodeposited layer with good comprehensive performance could be prepared.
作者
李智
宋万彤
陈伟荣
葛毓立
LI Zhi;SONG Wan-tong;CHEN Wei-rong;GE Yu-li(School of Mechanical Engineering,Dalian University,Dalian 116622,China)
出处
《材料保护》
CAS
CSCD
2021年第12期104-110,共7页
Materials Protection
基金
国防科技重点实验室基金项目(6142005180302)资助。
关键词
纳米镍基金属陶瓷
复合电沉积
组织性能
变频超声
nano nickel-based cermet
composite electrodeposition
microstructure and properties
variable frequency ultrasound
