对Q235钢电镀镍层进行渗硼处理,研究其渗层组织特性及抗高温氧化性能.用扫描电子显微镜(SEM)对镀镍渗硼层横断面进行了显微组织观察,用X射线能谱仪(EDS)分析了渗层不同部位的元素分布.结果表明,渗硼层为Fe2B,Ni4B3和Ni31Si12相,渗层厚度为33～254 μm,并随着渗硼温度和渗硼时间的增加而增加.用显微硬度计测试渗层的硬度分布,复合层(硼化物和硅化物层)的硬度值约为1753 HV,硼化物层的硬度值为1645 ～ 2003 HV,基体硬度为173 HV.镀镍层与镀镍渗硼层经700℃氧化40 h的高温氧化动力学曲线显示镀镍渗硼层的抗高温氧化性能优于镀镍层,Ni3Si,B2O3和SiO2产物起到提高其抗高温氧化性能的作用.
Microstructure characteristics and oxidation resistance of electroplating nickel coating on Q235 steel surface treated by boriding were studied.Microstructure,element distribution and hardness of the coating were characterized by means of scanning electron microscopy (SEM) and X-ray diffraction (XRD) with energy dispersive spectroscopy (EDS) analysis and hardness tests.The results show that the boriding layer consists of Fe2 B,Ni4B3 and Ni31 Si12 phases.With increasing of boriding temperature and time,the thickness of the coating layer increases from 33 to 254 μm.The hardness of the compund (boride and silicide) layer is about 1753 HV,iron boride layer is 1645-2003 HV,and steel substrate is 173 HV.The test results indicate that nickelplated-borided steel has superior oxidation resistance compared to nickelplated sample after oxidation at 700 ℃ for 40 h.The Ni3Si,B2O3 and SiO2 phases are responsible for the improved oxidation resistance of the nickelplated-borided steel.
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