FeCrMn_(x)AlCu高熵合金在3.5%NaCl溶液中耐腐蚀性能研究  

Corrosion Resistance of FeCrMn_(x)AlCu High-Entropy Alloy in 3.5wt%NaCl Solution

作　　者：冯力[1,2] 王志鹏 赵燕春 边春华[3] Feng Li;Wang Zhipeng;Zhao Yanchun;Bian Chunhua(School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China;State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China;China National Nuclear Power Operation and Management Co.,Ltd,Haiyan 313400,China)

机构地区：[1]兰州理工大学材料科学与工程学院,甘肃兰州730050 [2]省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050 [3]中核核电运行管理公司,浙江海盐313400

出　　处：《稀有金属材料与工程》2024年第11期3175-3184,共10页Rare Metal Materials and Engineering

基　　金：中核核电运行管理有限公司研发项目(QS4FY-22003224)。

摘　　要：采用真空电弧熔炼炉制备FeCrMn_(x)AlCu(x=0、0.5、1.0、1.5、2.0)高熵合金。通过XRD、SEM、EDS等设备检测分析了合金的微观组织和化学成分。同时,采用电化学极化曲线法和浸泡试验检测了合金在质量分数3.5%NaCl溶液中的耐腐蚀性,腐蚀后采用XPS设备对合金表面进行分析。微观组织表征结果表明,所制备的高熵合金呈现典型的枝晶和枝晶间组织,并具有fcc+bcc双相结构。腐蚀测试结果表明,在3.5%NaCl溶液中,高熵合金的耐蚀性能随着Mn含量增加先升高后下降,但与无Mn合金相比,含Mn的合金仍表现出更好的耐蚀性能。其中,FeCrMnAlCu高熵合金的耐蚀性能最好,表现出较正的自腐蚀电位(Ecorr=-0.417 V)和较小的自腐蚀电流密度(I_(corr)=2.120×10-6 A∙cm-2)。此外,FeCrMn_(x)AlCu高熵合金表现出活化行为,并形成不连续且松散的腐蚀产物膜。FeCrMn_(x)AlCu(x=0,0.5,1.0,1.5,2.0)high-entropy alloys were prepared using a vacuum arc melting furnace.The microstructure and chemical composition of the alloys were analyzed using XRD,SEM and EDS.Additionally,the corrosion resistance of the alloys in 3.5 wt%NaCl solution was evaluated through electrochemical polarization curve tests and immersion experiments.After corrosion,the alloy surfaces were analyzed using XPS equipment.The results of microstructure characterization show that the prepared high-entropy alloys exhibit typical dendritic and interdendritic structures and possess a dual-phase fcc and bcc structure.Corrosion test results indicate that the corrosion resistance of the high-entropy alloys increases initially and then decreases with the increase in Mn content.However,compared with the alloy without Mn,alloys containing Mn still exhibit better corrosion resistance.Among them,the FeCrMnAlCu high-entropy alloy demonstrates the best corrosion resistance with a more positive corrosion potential(Ecorr=-0.417 V)and a smaller corrosion current density(I_(corr)=2.120×10^(-6) A∙cm^(-2)).Furthermore,the FeCrMn_(x)AlCu high-entropy alloys exhibit activation behavior and form discontinuous and loose corrosion product films.

关 键 词：真空电弧熔炼 高熵合金 微观组织 耐蚀性 

分 类 号：TG139[一般工业技术—材料科学与工程]