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对球墨铸铁在不同温度和时间下分别进行渗硼处理,采用金相显微镜观察了渗硼层的形貌,测定了渗硼层的厚度;用显微硬度计测定了渗硼层的表面硬度;用X射线衍射仪分析了渗硼层的物相组成;用扫描电镜测定了渗硼层表面元素含量;并在10%的HCl、H2SO4、HNO3、NaCl、NaOH溶液中做了耐蚀性对比试验。结果表明:渗硼层厚度均匀,呈齿状结构与基体结合牢固,渗硼层主要由Fe2B单相组成;在950℃下保温不同时间,渗硼层的厚度及硬度均随时间的增长而逐渐增大;在不同温度下保温5 h时,渗硼层厚度随温度的升高而逐渐增大,渗硼层的硬度随温度的升高先增大后减小,除HNO3外,渗硼处理后试样的耐蚀性均比未渗硼的试样的耐蚀性能好。
The ductile cast iron was infiltrated at different temperatures and times respectively. The morphology of boronizing layer was observed by metallographic microscope and the thickness of boronizing layer was measured. The surface hardness of boronizing layer was measured by microhardness tester. The phase composition of boronizing layer was analyzed by X-ray diffractometer. The content of elements on the surface of boronizing layer was determined by scanning electron microscopy. The corrosion resistance of 10% HCl, H2SO4, HNO3, NaCl, NaOH solution . The results show that the thickness of boronizing layer is uniform, the dentate structure is firmly bonded with the substrate, and the boronizing layer mainly consists of single phase of Fe2B. The thickness and hardness of the boronizing layer gradually increase with the increase of time at 950 ℃ for different time, The hardness of boronizing layer first increases and then decreases with the increase of temperature. In addition to HNO3, after the boronizing treatment, the thickness of the boronizing layer gradually increases with the increase of temperature. Corrosion-resistant than the same boron-free sample corrosion resistance.