中文摘要：

采用40kV的氮等离子体离子注入工业纯铁，注入剂量为7×10^17ions／cm^2，X射线光电子能谱（XPS）研究表面注入层元素的成分和价态，X射线衍射（XRD）分析注入层的物相转变，采用恒电位极化腐蚀试验研究了离子注入后材料在人工模拟体液中腐蚀行为。试验结果表明，氮离子注入能有效的改善纯铁在模拟体液中的耐蚀性，XRD和XPS分析发现，在试样表层形成较多的γ^1-Fe4N化合物，有效的提高了材料表面的耐蚀性。

英文摘要：

Pure iron specimens were implanted by nitrogen ions with a fluence of 7 × 10^17 ions/cm^2 using ion beam implantation at an extracted voltage of 40kV. Composition and valence studies were carried out by X-ray photoemission spectroscopy （XPS）; Glancing angle X-ray diffraction （GAXRD） was employed to examine the phase transformation. The corrosion behavior of the samples was measured using potentiostatic polarization curves （E/I） in simulated body fluids（SBF） solution. The results have demonstrated that the surface corrosion resistance of nitrogen ion implanted samples can be improved in SBF solution. The analyses of XPS and XRD have shown that, after nitrogen ion implantation, the iron nitride of γ^1-Fe4N were formed on the implanted surface, and effectively improved the surface corrosion resistance.