基于Fe2Mo/B 强化耐锌铝熔体腐蚀超合金体系相平衡及组织性能的研究

热浸镀锌是防止钢铁材料腐蚀的重要手段。Zn-Al熔体对金属的腐蚀导致镀锌设备寿命短，形成锌渣，在镀层表面形成划痕，成为制约镀锌生产线效率和产品质量的关键因素。本工作从热力学和动力学角度出发，研究Mo、Cr、Si、B等元素在超合金中的扩散行为及超合金在Zn-Al熔体中的界面反应，重点研究富铝相的形成过程、影响因素及其对界面反应的抑制作用机理；测定Fe-(Co,Mo,Cr,Ni,Zr)-B和(Fe,Co)-Mo-Cr-(Ni,Mn,Zr)-(Si,B）体系的相关系，获得第三组元在Fe2B和Fe2Mo中的溶解度。通过多元合金化，提高Fe2B和Fe2Mo的热稳定性和耐腐蚀能力；根据获得的相关系，开发出以Fe代Co，基于Fe2Mo/B强化，以奥氏体保证韧性，Mo、Cr、B、Si等保证耐蚀性的新型耐Zn-Al熔体腐蚀的合金。界面反应的研究和新型合金的开发对于促进镀锌业发展具有重要的理论意义和应用价值。

Hot-dip galvanizing is one of the major methods used for steel to provide protection against corrosion. The corrosion of Zn-Al melt to the equipment used in zinc baths will reduce the service life and result in the formation of dross in the baths and the scratch on the surface of the coatings. The control of the corrosion is the key factor which decides the effectiveness of the galvanizing line and the quality of the coating. The diffusion behavior of Mo、Cr、Si、B in the solid solution of superalloy and the effect of these elements on the interfacial reaction will be investigated. The present work will focus on the formation of the rich-Al phase layer and it's effect on the interfacial reaction rate. The phase relations of Fe-(Co,Mo,Cr,Ni,Zr)-B and (Fe,Co)-Mo-Cr-(Ni,Mn,Zr)-(Si,B) will be determined experimentally. The solubility of the third element in the Fe2B and Fe2Mo will be determined. It will be hoped to increase the heat stability and anti-corrosion ability of these intermetallic compounds through alloying with the third element. According to the result of the phase equilibrium, base on the alloying principle that Fe2Mo/B phase provides strength, austenite matrix ensures the ductility and Mo、Cr、B increase the anti-corrosion ability, the Fe based superalloy with higher corrosion resistence will be developed to instead of Co base alloy. The researches on the interfacial reaction of the superalloy in the Zn-Al melt and the development of new alloy are of both scientific and commercial interest for the galvanizing industry.