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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33~254μm,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Si O2产物起到提高其抗高温氧化性能的作用。
The Q235 steel nickel plating boronizing treatment, the study of its infiltrated layer characteristics and high temperature oxidation resistance. Scanning electron microscope (SEM) was used to observe the microstructure of the nickel-plated boronizing layer. The elemental distribution of different parts of the plating layer was analyzed by X-ray EDS. The results show that the boronizing layer is Fe2B, Ni4B3 and Ni31Si12, the thickness of the layer is 33 ~ 254μm, and increases with boronizing temperature and boronizing time. The hardness distribution of the composite layer (boride and silicide layer) was measured to be about 1753 HV using a microhardness tester. The hardness of the boride layer was 1645 to 2003 HV and the substrate hardness was 173 HV. The high-temperature oxidation kinetics of nickel-plated and nickel-plated boronized layers at 700 ℃ for 40 h shows that the high-temperature oxidation resistance of the nickel-plated boronizing layer is better than that of the nickel-plated layer, and the products of Ni3Si, B2O3 and Si O2 The role of high temperature oxidation performance.