含镁Al-Zn镀层中周期层状组织的形成机理及耐蚀性研究

项目名称： 含镁Al-Zn镀层中周期层状组织的形成机理及耐蚀性研究

项目编号： No.51471140

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 一般工业技术

项目作者： 李智

作者单位： 湘潭大学

项目金额： 81万元

中文摘要： 申请者研究发现，Q235钢在添加镁的45%Al-Zn熔体中浸镀时，在铁基与铝锌熔体界面形成了铁铝化合物与铝锌交替出现的周期层状组织，且镀层耐蚀性提高。为明确周期组织的形成机理，本研究拟通过平衡合金法和热力学计算，获得Fe-Al-Zn-M(M=Mg,Ce,Si),合金体系的热力学数据及相关系, 以弄清熔体中元素M对合金相形成的影响；进而通过热浸镀实验和固态扩散偶实验，研究热浸镀工艺参数、熔体中铝锌比、合金元素M以及扩散组元的物理状态对镀层/扩散层组织的影响，并获得镀层/扩散层组织的生长动力学规律；然后采用长毛细管法实验获得熔体中铁与铝的浓度分布，采用分子动力学模拟铁与铝的扩散系数。最后，通过对周期层状组织及其它镀层组织耐蚀性能的对照分析，探索周期层状组织对耐蚀性的影响。该研究对于开发新的Al-Zn-M合金镀层具有一定的理论意义。

中文关键词： Al-Zn镀层；周期组织；形成机理；耐蚀性；相平衡

英文摘要： It was found by the applicant that the periodic lamellar structure with alternative Fe-Al intermetallic compounds and Al-Zn formed in the interface between Q235 steel and bath as a certain amount of Mg was added into the 45wt.%Al-Zn bath. To understand the formation mechanism of the structure, research will be carried firstly on the phase relationships and thermodynamic information in Fe-Al-Zn-M (M=Mg,Ce,Si) system by equilibrated alloys and thermodynamic calculations. Then through hot-dipping experiment and additional solid state diffusion couple , the effect of galvanizing parameters, the ratio of Al to Zn, the alloy element in bath and the physical state of diffusion component on the microstructure will be studied, the rule about growth dynamic of microstructure will be obtained. Thirdly, the concentration profiles of Fe and Al in bath will be measured through long capillary tube, and diffusion coefficients of Fe and Al will be calculated by molecular dynamics simulation. Finally, the effect of the periodic structure on the corrosion resistance will be studied by comparing the corrosion resistance between the periodic structure and other structure. The research has a certain theoretical significance for the development of new Al-Zn-M alloy coating.

英文关键词： Al-Zn coating;Periodic Microstructure;Formation Mechanism;Corrosion Resistance;Phase Equilibria