Fe元素含量对FeCrMnAlCu高熵合金在3.5%NaCl溶液中耐腐蚀性能的影响  

Influence of Fe Content on Corrosion Resistance of FeCrMnAlCu High-EntropyAlloysin 3.5%NaCl Solution

作　　者：冯力[1,2] 王兆钦 赵燕春 张维[3] Feng Li;Wang Zhaoqin;Zhao Yanchun;Zhang Wei(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 730050,China;China National Nuclear Power Operation and Management Corporation,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]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12期3373-3382,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：采用真空电弧熔炼技术制备了Fe_(x)CrMnAlCu(x=0,0.5,1,1.5,2)高熵合金,使用XRD、SEM、EDS对腐蚀前后合金的相结构与微观组织进行了表征,通过动电位极化曲线、EIS、XPS以及浸泡实验对合金在3.5%NaCl溶液中的腐蚀行为与氧化膜成分进行表征。结果表明:Fe_(x)CrMnAlCu高熵合金均为bcc+fcc相的双相结构,Fe元素的添加使得bcc相衍射峰强度逐渐增强。随着Fe含量的增加,合金的耐腐蚀性能先增强后减弱,添加了Fe元素的合金耐腐蚀性能均强于不含Fe的合金,这是由于Fe元素的加入使得晶粒尺寸发生了变化,使得单位面积上的晶界数量改变,从而造成耐腐蚀性能的变化。Fe_(x)CrMnAlCu合金的腐蚀类型主要为晶间腐蚀,腐蚀后合金表面形成了由各元素氧化物组成的氧化膜。Fe_(1.5)CrMnAlCu合金的自腐蚀电流密度最小(1.75×10^(-6)A/cm^(2))、自腐蚀电位最正(-0.589V),容抗弧半径最大。Fe_(x)CrMnAlCu(x=0,0.5,1,1.5,2)high-entropy alloys were prepared by vacuum arc melting.The phase structure and microstructureof thealloys before and after corrosion were characterized by XRD,SEM,and EDS.The corrosion behavior and oxide filmcompositionof thealloys in 3.5%NaCl solution were investigated by potentiodynamic polarization curves,EIS,XPS,and immersion tests.The resultsindicate that Fe_(x)CrMnAlCu high-entropy alloys exhibit a dual-phase structure of bcc+fcc.The addition of Fe enhances the intensityof thebcc phase diffraction peaks.As the Fe content increases,the alloy’s corrosion resistance initially improves and then deteriorates.Thealloyswith Fe addition exhibit superior corrosion resistance compared with those without Fe.This is attributed to the change in grain size causedby the addition of Fe,which alters the number of grain boundaries per unit area,consequently affecting the corrosion resistance.Theprimary type of corrosion observed in Fe_(x)CrMnAlCu alloys is intergranular corrosion.After corrosion,an oxide filmcomposed of variouselemental oxides forms on the alloy surface.The Fe_(1.5)CrMnAlCu alloy exhibits the lowest self-corrosion current density(1.75×10^(-6)A/cm^(2)),the most positive self-corrosion potential(-0.589 V),and the largest impedance arc radius.

关 键 词：高熵合金 真空电弧熔炼 微观结构 氧化膜 

分 类 号：TG139[一般工业技术—材料科学与工程]