含氯溶液中硫化物对铁基块体非晶合金点蚀萌生与扩展的影响机制

项目名称： 含氯溶液中硫化物对铁基块体非晶合金点蚀萌生与扩展的影响机制

项目编号： No.51461031

项目类型： 地区科学基金项目

立项/批准年度： 2015

项目学科： 一般工业技术

项目作者： 王善林

作者单位： 南昌航空大学

项目金额： 48万元

中文摘要： 采用工业原材料制备的铁基块体非晶合金中容易形成硫化物夹杂，破坏其化学成分和显微结构的均匀性，降低非晶合金的耐点蚀性能。目前，鲜有关于铁基块体非晶合金点蚀性能的相关研究，对铁基非晶合金点蚀的萌生机理尚未形成统一认识，且对其扩展规律并不清楚，阻碍铁基块体非晶合金作为耐蚀材料的工程应用。本项目以工业纯铁及其它铁合金为原材料，在工业环境下制备铁基块体非晶合金，改变Mn、S元素含量，控制硫化物特性，如大小、形状及成分，研究含氯溶液中硫化物对其点蚀性能的影响；建立硫化物特性、氯离子溶度、温度与点蚀电位之间的定量分析模型，分析其点蚀敏感性；采用AFM、EPMA、TEM及XPS等，研究钝化膜特征、硫化物形貌、基体界面区成分及蚀孔三维尺寸的变化规律，探索铁基非晶合金点蚀萌生与扩展规律，建立点蚀萌生的热力学准则和扩展的动力学模型，揭示其点蚀机理，为促进铁基块体非晶合金作为耐蚀材料的工程应用提供试验和理论依据

中文关键词： 铁基块体非晶；硫化物；点蚀机理；氯化物溶液

英文摘要： The pitting corrosion resistance of Fe-based bulk metallic glass (Fe-BMG) will be deteriorated since the homogeneity in chemical composition and microstructure is destroyed by in situ formed sulfide in Fe-BMG fabricated using raw industrial materials. Up to now, the researches about pitting corrosion resistance of Fe-BMG are lack, and no one of pitting initiation theories is approved comprehensively, moreover, the behaviors of pitting propagation are not explored extensively.all of those will impede the engineering application of Fe-BMG as anti-corrosive material. In this project, Fe-BMG will be fabricated using pig-iron and another ferralloys in industrial condition. By changing addition of alloying elements Mn and S, the characteristics of sulfide inclusion, such as size, shape and composition, will be varied. By analyzing the effects of sulfide inclusion on pitting corrosion resistance with electrochemical Lab-station in chloride solution, the quantitative analysis model will be established between the characteristics of sulfide inclusion,chlorinic ion concentration, envioremental temperature and pitting potential, so pitting susceptibility will be evaluated for Fe-BMG in chloride solution. With the equipments of AFM, EPMA, SIMS, XPS and so on, the pitting mechanism of Fe-BMG will be explored by analyzing the variation about the characteristics of passive film, the shape of sulfide inclusion, the composition of metallic matrix in interface, and the three-dimension size of pit hole, and exploring the regularity of the pitting initiation and pitting propagation in Fe-BMG, and establishing thermodynamic rule of pit initiation and the kinetic model of pit propagation, which will provides experimental and theoretical principle for promoting the extinsive application of Fe-BMG as anti-corrosive materials in industry.

英文关键词： Fe-based bulk metallic glass;sulfide;pitting mechanism;chloride solution