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采用电刷镀技术,以Ni-Cr镀液制备了Ni-Cr纳米电刷镀层并对其进行了退火处理;采用X射线衍射仪,扫描电子显微镜,能量色散谱仪分析了不同温度下退火处理的Ni-Cr纳米镀层的形貌以及结构;分别利用MH-5-VM型显微硬度计和CSM摩擦试验机测定了刷镀层的显微硬度和摩擦磨损性能.研究结果表明:镀层晶粒的大小均为纳米级,随温度变化不大,介于10~20 nm之间,在500℃以下,Cr以固溶体形式存在于Ni的晶格中,500℃以上Cr从Ni的晶格中析出;镀层的耐磨性随退火温度的变化与镀层的硬度随温度的变化大致相同:Ni-Cr刷镀层在400℃退火处理时,硬度最大,磨损率最小.
Ni-Cr nano-brush coating was prepared by Ni-Cr plating solution and annealed by using brush plating technology. The effects of annealing treatment at different temperatures were analyzed by X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy Ni-Cr nano-coating morphology and structure; the microhardness and friction and wear properties of the brush coating were measured by MH-5-VM microhardness tester and CSM friction tester respectively.The results show that: The size of nanocrystals is nanoscale with little change of temperature, ranging from 10 to 20 nm. Below 500 ℃, Cr exists as a solid solution in the lattice of Ni, and more than 500 ℃ of Cr precipitates from the lattice of Ni. The wear resistance of the coating changes with the annealing temperature and the hardness of the coating changes with the temperature approximately the same: Ni-Cr brush plating annealing at 400 ℃, the hardness of the smallest wear rate.