中文摘要：

采用低电压高频率脉冲等离子体浸没离子注入与氮化技术在工业纯铁上进行氮离子注入及氮化强化处理,研究了不同脉冲宽度下,工业纯铁等离子体浸没离子注入与氮化处理的结构及性能。通过X射线衍射谱（XRD）、X射线光电子能谱（XPS）、扫描电子显微镜（SEM）、显微硬度、销-盘磨损实验,研究了工业纯铁氮离子注入及氮化后的结构、断面组织、表面元素含量、显微硬度、摩擦磨损性能；通过电化学极化方法在0.9%NaCl溶液研究了改性层的耐腐蚀性。研究结果表明：氮等离子注入及氮化后能显著提高纯铁表面的显微硬度、耐磨性和耐腐蚀性能,且表面形成结构为Fe3N和Fe4N的针状组织,针状组织是提高纯铁性能的关键因素；高脉冲宽度下进行等离子注入及氮化有利于提高纯铁表面的机械性能和耐腐蚀性能。

英文摘要：

Commercial pure iron was modified by high frequency and low voltage plasma immersion and ion implantation （HLPⅢ） at different pulse duration. The microstructure, the surface elemental contents, microhardness and wear resistance were characterized with X-ray diffraction （XRD）, XPS, scanning electron microscope （SEM）, HXD1000 microhardness meter, CSEM pin-on-disk wear test apparatus. The corrosion resistance was evaluated using anodic polarization tests in 0.9% NaCl solution. The results showed that plasma nitriding on commercial pure iron at different pulse duration can obviously enhance microhardness, wear resistance and corrosion resistance. The microstructure of the nitrided layers was Fe3N and Fe4N, and there was some needle-like structure in the layer. The high pulse duration was helpful for improving mechanical property and corrosion resistance of the commercial pure iron nitrided layers.