Li Wenqiang, Lian Jie, Wang Dengfeng, Zhang Suo, Han Chengfu, Du Zhenyu, Li Fushan
School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China.
Henan Coal Science Academy Wear-Resistant Technology Co., Ltd., Zhengzhou 450001, China.
Materials (Basel). 2024 Dec 27;18(1):72. doi: 10.3390/ma18010072.
In this study, FeCoNiCrSi (x = 0, 4, and 8) powders were successfully prepared using the aerosol method and employed to produce high-entropy coatings on Q235 steel via laser cladding. The microstructure and phase composition of the coatings were analyzed using scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction. Corrosion resistance and potential were evaluated through electrochemical analysis and Kelvin probe force microscopy. The results show that the FeCoNiCrSi coatings exhibit excellent metallurgical bonding with no visible porosity or cracks. The coating primarily consists of an FCC structure; however, as the Si content increases, the structure transitions to a mixed FCC + BCC phase. The addition of Si also refines the grain size in the alloy system. Electrochemical analysis reveals that the Si0 and Si4 coatings exhibit similar corrosion behavior, while the Si8 coating shows a significant drop in corrosion potential, reducing its corrosion resistance. As the Si content increases, grain refinement leads to more grain boundaries, but the corrosion resistance decreases due to the lower corrosion performance of Si compared to Co. Considering both cost and corrosion resistance, the Si4 coating offers a balance of low cost and excellent corrosion resistance.
在本研究中，采用气溶胶法成功制备了FeCoNiCrSi（x = 0、4和8）粉末，并通过激光熔覆在Q235钢上制备了高熵涂层。利用扫描电子显微镜、能量色散X射线光谱仪和X射线衍射对涂层的微观结构和相组成进行了分析。通过电化学分析和开尔文探针力显微镜对耐腐蚀性和电位进行了评估。结果表明，FeCoNiCrSi涂层表现出优异的冶金结合，无明显孔隙或裂纹。涂层主要由面心立方（FCC）结构组成；然而，随着Si含量的增加，结构转变为FCC + BCC混合相。Si的添加还细化了合金体系中的晶粒尺寸。电化学分析表明，Si0和Si4涂层表现出相似的腐蚀行为，而Si8涂层的腐蚀电位显著下降，降低了其耐腐蚀性。随着Si含量的增加，晶粒细化导致更多的晶界，但由于Si的耐腐蚀性能低于Co，耐腐蚀性降低。综合考虑成本和耐腐蚀性，Si4涂层实现了低成本与优异耐腐蚀性的平衡。
