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采用扫描电镜、X射线衍射(XRD)、极化曲线和显微硬度等方法研究表面离子渗氮X12Cr13马氏体不锈钢的渗氮层成分、显微组织结构、硬度以及腐蚀性能。结果表明:离子渗氮马氏体不锈钢表面形成了70μm的渗氮层,渗氮层由化合物层和扩散层组成,化合物层的组成相主要为γ-Fe N和ε-Fe N。离子渗氮不锈钢经过72 h纯水浸泡后表面发生点蚀。基体内部向表层的扩散降低了钢中的固溶铬含量以及渗氮层形成的孔隙和裂纹共同降低马氏体不锈钢的耐腐蚀性。
The composition, microstructure, hardness and corrosion resistance of nitrided layer of surface nitrided X12Cr13 martensitic stainless steel were studied by scanning electron microscopy, X-ray diffraction (XRD), polarization curve and microhardness. The results show that the nitrided layer with a thickness of 70μm is formed on the surface of the ion nitrided martensitic stainless steel. The nitrided layer is composed of the compound layer and the diffusion layer. The composition of the layer is mainly γ-Fe N and ε-FeN. Ion nitriding stainless steel pitting surface after 72 h of pure water immersion. The diffusion of the interior of the substrate to the surface layer reduces the amount of dissolved chromium in the steel and the porosity and cracks formed by the nitrided layer together to reduce the corrosion resistance of the martensitic stainless steel.