热浸镀Al-Zn-Si镀层界面反应及熔池中合金元素的作用研究

项目名称： 热浸镀Al-Zn-Si镀层界面反应及熔池中合金元素的作用研究

项目编号： No.51271040

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 一般工业技术

项目作者： 涂浩

作者单位： 常州大学

项目金额： 80万元

中文摘要： Galvalume镀层具有优良的耐腐蚀性能，但其熔池中的锌渣严重地影响到产品质量及生产效率，目前还没有彻底解决之良策。通过降低熔池中铝含量、实现有效硅的精确控制，运用合金化手段改善镀层性能可能解决这一难题。本研究将实验测定和评估相关体系600℃等温截面的相关系及热力学性质，获得有效硅的热力学模型；结合镀层生长动力学，探索合金元素M及其协同作用对镀层结构、表层凝固组织以及锌渣种类与数量的影响规律；建立界面反应模型，利用扩散通道理论解释有效硅的作用机理。利用盐雾实验等方法研究合金元素M及其协同作用对镀层耐蚀性能的影响；综合考虑耐蚀性、粘附性、熔体流动性以及锌渣等因素，结合CALPHAD技术优化合金的成分，获得与Galvanume镀层耐腐蚀性能相当的低铝合金镀层。这些研究将丰富Zn-Al-Si镀层界面反应理论，对解决锌铝熔池底渣问题，开发有自主知识产权的热浸镀产品具有重要参考价值。

中文关键词： Al-Zn-Si 镀层；界面反应；有效硅；相平衡；热力学和动力学

英文摘要： Galvalume coating has been developed rapidly in recent years for its excellent corrosion resistance. But dross produced in zinc bath has a bad effect on coatings' quality and production efficiency, and this problem has not yet been settled. Improving coatings' structure and property by reducing aluminum content in molten bath, precisely controlling content of effective silicon and alloying method is a possible solution. This study will experimentally determine isothermal sections of phase diagrams of related systems at the 600℃, corresponding thermodynamic descriptions will be evaluated, and effective silicon in zinc bath will be mathematically defined. Coupled with kinetic experiments of coatings' growth, alloy element (M) s' synergistic effect on coatings' structure, top solidification structure and characteristics of dross will be analyzed, interfacial reaction will be modeled, and the role of silicon in molten zinc-aluminum bath will be explained by diffusion path theory. By means of salt spray tests a study of the corrosion of coating will be carried out. By taking into account several effects such as corrosion resistance, adhesion abilities, flux mobility and doss formation, a new type of zinc alloy will be developed with CALPHAD method.These investigations will enrich the Zn-Al-Si coatings' interfacial re

英文关键词： Al-Zn-Si coating；interfacial reaction；effective silicon；phase equilibrium；thermodynamic and dynamics