铸态和烧结态AlCoCrFeNi高熵合金模拟海水腐蚀性能研究  

Study of Simulated Seawater Corrosion Performance of AlCoCrFeNi High Entropy Alloy in As-Cast and Sintered State

作　　者：熊艳杰 徐大鹏[1] 程赵辉 魏敬鹏 XIONG Yanjie;XU Dapeng;CHENG Zhaohui;WEI Jingpeng(School of Materials and Chemical Engineering,Xi’an Technological University,Xi’an 710021,China)

机构地区：[1]西安工业大学材料与化工学院

出　　处：《西安工业大学学报》2020年第1期76-81,共6页Journal of Xi’an Technological University

基　　金：国家自然科学基金（51571155）;陕西省教育厅重点实验室基金（17JS054）;陕西省自然科学基础研究计划项目（2017JM5057）

摘　　要：为了研究铸态和烧结态AlCoCrFeNi高熵合金在模拟海水介质下的电化学腐蚀性能,采用真空电弧熔炼和放电等离子烧结工艺制备AlCoCrFeNi高熵合金,分别采用X射线衍射仪(XRD)和光学显微镜(OM)分析其相结构和微观组织,采用电化学工作站对其进行电化学试验测试。研究结果表明:AlCoCrFeNi铸态合金组织呈现等轴晶形貌,物相为单一BCC结构;烧结态合金组织呈球形形貌,在900℃的烧结温度下,除了BCC相,还出现极少量的B2相以及FCC相。烧结态和铸态自腐蚀电位分别为-0.5354 V和-0.6676 V,自腐蚀电流密度分别为2.9149×10^-5 A·cm^-2和2.1504×10^-5 A·cm^-2,铸态合金的钝化区比烧结态宽。2种合金均只出现一个容抗弧,且铸态合金的容抗弧半径远大于烧结态合金,表明铸态合金的耐蚀性优于当前烧结温度下的烧结态合金。In order to study the electrochemical corrosion performance of as cast and sintered AlCoCrFeNi high entropy alloys in simulated seawater medium,vacuum arc melting and spark plasma sintering processes were used to prepare AlCoCrFeNi high entropy alloys.Their structure and microstructure were analyzed in the XRD and OM,respectively,and the electrochemical test was performed in the electrochemical workstation.The results show that the AlCoCrFeNi as cast alloy has an equiaxed morphology and its phase shows a single BCC structure;the sintered alloy has a spherical morphology.At 900℃sintering temperature,a small amount of B2 and FCC phase as well as BCC phase appear.The sintered and cast self corrosion potentials are-0.5354 V and-0.6676 V,respectively,and their self corrosion current density are 2.9149×10^-5 A·cm^-2 and 2.1504×10^-5 A·cm^-2.The passivation zone of the as cast alloy is wider than that of the sintered alloy.Both alloys have only one capacitive arc,and the radius of the capacitive arc of the as cast alloy is much larger than that of the sintered alloy,which indicates that the corrosion resistance of the as cast alloy is better than the sintered alloy at the current sintering temperature.

关 键 词：真空电弧熔炼 放电等离子烧结 高熵合金 模拟海水 电化学腐蚀 

分 类 号：TG142.71[一般工业技术—材料科学与工程]