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首次采用空气、氮气和氢气混合气源对45钢进行离子氧氮共渗,并研究空气流量对渗速和组织性能的影响。采用金相显微镜、X射线衍射、电化学工作站对处理后的45钢进行测试和分析。研究结果表明,在离子氧氮共渗过程中添加适量的空气比传统离子氧氮共渗有显著的优势,其中空气流量为0.2 L/min时获得最佳渗层厚度与耐蚀性。温度550℃、保温4h工艺条件下,渗层厚度达到约60μm,是传统离子渗氮的2倍以上;耐腐蚀性也比传统离子渗氮有进一步提高。0.2 L/min的空气流量得到的铁氧化合物主要是Fe_3O_4,空气流量≥0.4 L/min时,Fe_2O_3相增加,氮氧共渗效果变差。
The first time using air, nitrogen and hydrogen gas mixture of 45 steel ion nitriding, and study the air flow rate and microstructure and properties. The treated 45 steel was tested and analyzed by metallographic microscope, X-ray diffraction and electrochemical workstation. The results show that adding appropriate amount of air during ionoxigenation has a significant advantage over traditional ionoxynitriding, in which the optimal layer thickness and corrosion resistance are obtained when the air flow rate is 0.2 L / min. Under the condition of temperature 550 ℃ and heat preservation 4h, the thickness of the infiltrated layer reaches about 60μm, which is more than twice that of the conventional ion nitriding. The corrosion resistance is further improved than that of the conventional ion nitriding. The ferric oxide obtained at the air flow rate of 0.2 L / min was mainly Fe 3 O 4. When the air flow rate was ≥ 0.4 L / min, the Fe 2 O 3 phase increased and the effect of nitriding became worse.