酸处理优化Fe_(40)Mn_(20)Cr_(20)Ni_(20)高熵合金抗点蚀性能  

Optimizing pitting corrosion resistance of Fe_(40)Mn_(20)Cr_(20)Ni_(20)high entropy alloy through acid treatment

作　　者：王重 孙一璞 简选 王银凤 李祖鹏[5] WANG Zhong;SUN Yipu;JIAN Xuan;WANG Yinfeng;LI Zupeng(College of Mechanical and Vehicle Engineering,Institute of Applied Mechanics,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China;College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China;College of Chemistry and Chemical Engineering,Shaanxi Key Laboratory of Chemical Reaction Engineering,Yan'an University,Yan'an 716000,Shaanxi,China;.Jiangxi Hongdu Aviation Industry Co.,Ltd.,Nanchang 330024,Jiangxi,China;Guangdong Provincial Key Laboratory of Petrochemical Equipment Fault Diagnosis,Guangdong University of Petrochemical Technology,Maoming 525000,Guangdong,China)

机构地区：[1]太原理工大学机械与运载工程学院,应用力学研究所,山西太原030024 [2]太原理工大学材料科学与工程学院,山西太原030024 [3]延安大学化学与化工学院,陕西省化学反应工程重点实验室,陕西延安716000 [4]江西洪都航空工业股份有限公司,江西南昌330024 [5]广东石油化工学院,石化装备智能安全广东省重点实验室,广东茂名525000

出　　处：《钢铁研究学报》2024年第4期511-519,共9页Journal of Iron and Steel Research

基　　金：国家自然科学基金资助项目(52201188);陕西省教育厅重点科学研究计划资助项目(23JY084)。

摘　　要：利用电化学测试方法,系统研究了Fe_(40)Mn_(20)Cr_(20)Ni_(20)高熵合金在10%(质量分数)H_(2)SO_(4)溶液,3.5%(质量分数)NaCl溶液与3.7%(质量分数)HCl溶液中的耐蚀性。发现该高熵合金在10%(质量分数)H_(2)SO_(4)溶液中表现出优异的耐蚀和钝化性能。但由于Mn含量较高,导致其耐Cl-侵蚀能力较差。通过X射线光电子能谱分析(XPS)发现,经过在10%(质量分数)H_(2)SO_(4)溶液中的阳极极化处理后,Fe_(40)Mn_(20)Cr_(20)Ni_(20)高熵合金表面形成的钝化膜主要为Cr(OH)_(3)。电化学阻抗谱(EIS)结果显示,经过阳极极化处理后,Fe_(40)Mn_(20)Cr_(20)Ni_(20)高熵合金在3.7%(质量分数)HCl溶液的耐Cl^(-)侵蚀能力显著提高,电荷转移电阻(Rct)值增加了1.7倍。研究结果表明,通过在H_(2)SO_(4)溶液中进行阳极极化处理以形成稳定钝化膜,可有效提高FeMnCrNi系高熵合金耐点蚀性能,具有重要的研究价值和广阔的应用前景。The corrosion resistance of the Fe_(40)Mn_(20)Cr_(20)Ni_(20)high-entropy alloy(HEA)was systematically investigated by electrochemical tests in various solutions,including 10 wt.%H_(2)SO_(4),3.5 wt.%NaCl,and 3.7 wt.%HCl solution.The HEA exhibited outstanding corrosion resistance and passivation behavior in the 10 wt.%H_(2)SO_(4) solution.Nevertheless,the Mn content in the matrix adversely affected its resistance to pitting corrosion.X-ray photoelectron spectroscopy(XPS)analysis reveals that the passivation film formed on the Fe_(40)Mn_(20)Cr_(20)Ni_(20)HEA after anodic polarization in the 10 wt.%H_(2)SO_(4) solution predominantly consists of Cr and its oxides,with Cr(OH)_(3) being the primary compound.The electrochemical impedance spectroscopy(EIS)results revealed a noteworthy enhancement in the corrosion resistance of the Fe_(40)Mn_(20)Cr_(20)Ni_(20)HEA when exposed to a 3.7 wt.%HCl solution,achieved through anodic polarization.This treatment resulted in a remarkable 1.7-fold increase in the charge transfer resistance(R_(ct))value.The findings strongly suggest that utilizing anodic polarization in the H_(2)SO_(4) solution to establish a stable passivation film is an effective strategy for improving the resistance of FeMnCrNi HEAs to pitting corrosion.This method holds significant research significance and possesses broad potential applications.

关 键 词：高熵合金 阳极极化 点蚀 电化学阻抗谱 钝化 

分 类 号：TG174.41[金属学及工艺—金属表面处理] TG139[金属学及工艺—金属学]