摘要
采用溶胶-凝胶法制备了Al_(2)O_(3)溶胶,并用表面活性剂对氧化石墨烯颗粒进行改性,通过透射电镜(TEM)对Al_(2)O_(3)溶胶、石墨烯分散液在镀液中的分散情况进行了表征。然后采用电刷镀技术在优质合金钢表面制备了Ni-P/Al_(2)O_(3)/石墨烯复合刷镀层,对制备的Ni-P/Al_(2)O_(3)/石墨烯涂层进行100~500℃的热处理,利用扫描电镜(SEM)、显微硬度计、电化学工作站和摩擦磨损试验机等研究了其微观形貌、力学及摩擦学性能。结果表明:Al_(2)O_(3)溶胶和改性后的石墨烯分散液在复合镀液中具有良好的分散性和稳定性。当热处理温度达到400℃时,Ni-P/Al_(2)O_(3)/石墨烯镀层表面致密、未出现裂纹,显微硬度高达869.8 HV0.2,耐磨性最佳,其平均摩擦系数为0.11,表明热处理有效改善了Ni-P/Al_(2)O_(3)/石墨烯复合涂层的磨损性能和摩擦系数。同时,经热处理后复合镀层的耐腐蚀性能比镀态好。
Al_(2)O_(3) sol was prepared by sol-gel method, and graphene oxide particles were modified by surfactant, the dispersion of Al_(2)O_(3) sol and graphene oxide in the plating bath was characterized by transmission electron microscopy(TEM). Ni-P/Al_(2)O_(3)/graphene composite brush coatings were prepared on the surface of high-quality alloy steel by electro-brush plating, and heat treatment at 100-500 ℃ of the prepared Ni-P/Al_(2)O_(3)/graphene coatings was carried out. Microstructure, mechanical and tribological properties of the coatings were studied by means of scanning electron microscopy(SEM), microhardness meter, electrochemical workstation and friction and wear tester. The results show that the Al_(2)O_(3) sol and the modified graphene have good dispersion and stability in the composite plating bath. When the heat treatment temperature is 400 ℃, the surface of the Ni-P/Al_(2)O_(3)/graphene coatings is dense and crack-free, the microhardness reaches 869.8 HV0.2, the wear resistance is the best, and the average friction coefficient is 0.11, indicating that the heat treatment can effectively improve the wear performance and friction coefficient of the Ni-P/Al_(2)O_(3)/graphene coatings. Furthermore, the corrosion resistance of the coatings after heat treatment is better than that of the coatings without heat treatment.
作者
张春杰
应丽霞
吴云龙
王桂香
ZHANG Chun-jie;YING Li-xia;WU Yun-long;WANG Gui-xiang(College of Mechanical and Electrical Engineering,Harbin Engineering University,Harbin 150001,China;College of Materials Science and Chemical Engineering,Harbin Engineering University,Harbin 150001,China)
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2021年第4期153-159,共7页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(52075112)
黑龙江省自然科学基金(JJ2019LH1520)。
关键词
电刷镀
热处理
组织结构
摩擦学性能
electro-brush plating
heat treatment
microstructure
tribological property
