Q235钢和QT450-10铸铁等离子扩渗防蚀耐磨工艺研究

Anti-rustiness and wear-resistance technology of Q235 steel and QT450-10 ductile cast iron by plasma penetrating

利用等离子氮碳氧扩渗技术对Q235钢和QT450-10铸铁进行扩渗处理,获得既耐蚀又耐磨的扩渗层。采用金相显微镜、显微硬度计、X射线衍射(XRD)和扫描电镜/能谱(SEM/EDX)分析了渗层的微观形貌、硬度、相结构和成分。采用电化学测试和中性盐雾试验研究了渗层的耐蚀性。研究结果表明,等离子扩渗层由化合物层和扩散层组成;化合物层主要由ε相和Fe3O4相组成;表面硬度提高;电化学测试表明,渗层具有阳极钝化能力,耐蚀性提高;等离子扩渗后进行封闭处理,能产生协同效应,耐中性盐雾腐蚀性能大大提高。

The plasma N-C-O penetrating tecbnique was used on Q235 steel and QT450-10 ductile cast iron to get the penetrated layer of both anti-rustiness and wear-resistance. The morphology, hardness, phase structure and composition of the penetrated layer were analyzed by means of metallographic microscope, microhardness tester, X-ray diffraction （ XRD ） and scanning electron microscopy/spectroscopy （ SEM/ EDX）. The anti-rustiness property was investigated by electrochemical tests and neutral salt spray test（NSS）. The results show that the penetrated layer is composed of compound layer and diffusion layer. The compound layer mainly consists of e phase and Fe304 phase. The surface hardness is improved. Electrochemical tests show that the penetrated layer can obtain anode passivation ability and has a preferable corrosion resistance. The neutral salt spray corrosion resistance of the penetrated layer with sealing treatment can be greatly improved.