合金化对熔盐渗制备Fe3Si防护层的影响及渗层抗蚀机制研究

项目名称： 合金化对熔盐渗制备Fe3Si防护层的影响及渗层抗蚀机制研究

项目编号： No.51501138

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 一般工业技术

项目作者： 许妮君

作者单位： 西安建筑科技大学

项目金额： 20万元

中文摘要： Fe3Si金属间化合物结构材料应用开发的难点在于其室温脆性大，难制备。本项目提出通过中性熔盐非电解浸渗在合金钢表面扩散渗原位反应来制备Fe3Si防护层，利用元素合金化对扩散渗原位反应过程和良好韧性增强会产生影响，以实现韧性良好的合金化Fe3Si金属间化合物防护层材料的制备。通过探讨各合金化元素对合金钢和表面镀有不同合金化元素镀层钢材的渗硅过程、渗层微观结构、强韧性等影响，以揭示熔盐渗制备Fe3Si金属间化合物渗层材料的合金化增韧机制，以及各合金化元素对Fe3Si渗层形成动力学和微观结构的影响规律；通过探讨所制备的渗层在典型水溶液介质中的腐蚀行为、环境退化过程、表面钝化膜半导体特性，来阐明Fe3Si防护层的抗蚀机制、电化学腐蚀规律和环境退化特征，从而为质优价廉的Fe3Si金属间化合物防护层在冶金、化工、石油炼制等苛刻工业环境下应用提供技术指导和理论支撑。

中文关键词： 熔盐渗硅；Fe3Si金属间化合物；表面合金化；电化学腐蚀

英文摘要： High brittleness sensitivity and high processing difficulties of Fe3Si structure intermetallic material at room temperature is the biggest obstacle for its preparing and application. In order to obtain high toughness Fe3Si intermetallic compound material, the Fe3Si layer is prepared by means of in situ diffusion permeability rather than electroplating on alloying steel surface in neutral molten salts in this research. Moreover, the influence of alloying elements on diffusion permeability processing and layer toughening is utilized to prepare the Fe3Si intermetallic protection layer with higher toughness.The alloying toughness enhancing mechanism of Fe3Si layer by molten salts siliconizing and effect of alloying elements on formation dynamics and microstructure of siliconizing layer is revealed through investigating the influence of alloying elements and various alloying metal plating layer on alloying steels siliconizing process, microstructure, strength and toughness properties of the resulted siliconizing layer.Furthermore, the anti-corrosion mechanism, electrochemical corrosion discipline and environmental degradation characteristic of Fe3Si layer is obtained through analyzing the corrosion behavior of siliconizing layer, environmental degradation process and semiconductor properties of surface passivating film in typical aqueous solution. As a result, the technical guidance and theoretical foundation would be achieved for the application of Fe3Si intermetallic layer with high performance and inexpensive in the harsh environments of metallurgy industry, chemical engineering and petroleum refining industry.

英文关键词： molten salt siliconizing ;Fe3Si intermetallic;surface alloying;electrochemical corrosion