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采用激光熔覆技术在304L不锈钢基体表面制备了Fe-Cr-Si-P非晶复合涂层。利用光学显微镜(OM)、X射线衍射仪(XRD)、扫描电子显微镜(SEM)、电化学测试系统和摩擦磨损试验机等分析了涂层的组织结构、相组成、耐蚀及耐磨等性能。研究结果表明,激光熔覆层组织主要由表层“梅花”形树枝晶区,中心非晶区和树枝晶结合区组成,熔覆层与基体呈现良好的冶金结合。熔覆层中除了非晶相外,还有少量Fe3P和Fe2Si等金属间化合物相。涂层的硬度HV0.2约为8000 MPa,是基体硬度的4倍;腐蚀电位Ecorr和自腐蚀电流密度icorr分别为–449.3 mV和–4.34μA/cm2;在100 N载荷下摩擦系数仅为0.076,具有较好的综合性能。
The Fe-Cr-Si-P amorphous composite coating was prepared on the surface of 304L stainless steel by laser cladding. The microstructure, phase composition, corrosion resistance and wear resistance of the coatings were analyzed by optical microscope (OM), X-ray diffraction (XRD), scanning electron microscopy (SEM), electrochemical test system and friction and wear tester . The results show that the microstructure of the laser cladding layer mainly consists of surface “plum ” shaped dendrite zone, central amorphous zone and dendritic junction zone, and the cladding layer and the substrate exhibit good metallurgical bonding. In addition to the amorphous coating cladding layer, there are a small amount of Fe3P and Fe2Si intermetallic compound phase. The HV0.2 hardness of the coating is about 8000 MPa, which is four times that of the substrate. The corrosion potential Ecorr and the self-corrosion current density icorr are -449.3 mV and -4.34 μA / cm2 respectively. The friction coefficient under the load of 100 N is only 0.076 , With good overall performance.