摘要
采用冷喷涂技术在镍铝青铜(NAB) 9442合金上制备了较为致密,厚度约300μm的镍铝青铜涂层,使用SEM、XRD、XPS、电化学工作站、磨蚀试验机观察并测试了镍铝青铜合金与涂层的组织形貌、电化学行为与磨蚀性能。结果表明:电化学腐蚀后基体发生了晶间腐蚀和选相腐蚀,涂层被腐蚀后颗粒上出现微孔和裂纹;磨蚀过程中存在着摩擦与钝化的协同作用以及摩擦促进阳极溶解的过程;相比于静态条件下,涂层与基体在磨蚀条件下测得的自腐蚀电位有大幅度下降,自腐蚀电流均提高了1个数量级,涂层与基体耐腐蚀性能变差;相比于干摩擦过程,磨蚀过程中涂层与基体的摩擦系数均有较大提高,减磨性能变差。
Nickel aluminum bronze(NAB) coating was deposited on the nickel aluminum bronze 9442 alloy by cold spraying.Microstructure,electrochemical behavior and tribocorrosion behavior were observed and tested by SEM,OM,XRD,XPS,electrochemical working station and abrasion machine.The results show that intergranular corrosion and optional corrosion take place in electrochemical corrosion process,microspore and cracks appear on the coating after electrochemical corrosion;tribocorrosion process consists of competition between friction and passivation and promotion of anodic dissolution by friction.Compared with static state,Ecorr of the coating and the substrate under tribocorrosion condition is drastically decreased,their Icorr is increased by an order of magnitude,and their corrosion resistance becomes worse.Compared with dry friction,friction coefficient of the coating and the substrate is increased significantly,while their wear resistance becomes worse.
作者
孙晓峰
陈正涵
李占明
黄元林
史玉鹏
Sun Xiaofeng;Chen Zhenghan;Li Zhanming;Huang Yuanlin;Shi Yupeng(Academy of Army Armored Forces,Beijing 100072,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2018年第11期3493-3498,共6页
Rare Metal Materials and Engineering
关键词
镍铝青铜
冷喷涂
电化学:磨蚀
nickel aluminum bronze
cold spray
electrochemical abrasion
