酸处理优化Fe40Mn20Cr20Ni20高熵合金抗点蚀性能
Optimizing pitting corrosion resistance of Fe40Mn20Cr20Ni20 high entropy alloy through acid treatment
王重 1孙一璞 2简选 3王银凤 4李祖鹏5
作者信息
- 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
- 折叠
摘要
利用电化学测试方法,系统研究了 Fe40Mn20Cr20Ni20高熵合金在10％(质量分数)H2SO4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)H2SO4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)H2SO4溶液中的阳极极化处理后,Fe40Mn20Cr20Ni20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,Fe40Mn20Cr20Ni20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H2SO4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.
Abstract
The corrosion resistance of the Fe40 Mn20Cr20 Ni20 high-entropy alloy(HEA)was systematically investigated by electrochemical tests in various solutions,including 10 wt.％H2SO4,3.5 wt.％NaCl,and 3.7 wt.％HCl solution.The HEA exhibited outstanding corrosion resistance and passivation behavior in the 10 wt.％H2SO4 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 Fe40 Mn20Cr20 Ni20 HEA after anodic polarization in the 10 wt.％H2 SO4 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 Fe40 Mn20Cr20 Ni20 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(Rct)value.The findings strongly suggest that utilizing anodic polarization in the H2SO4 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Key words
high entropy alloy/anodic polarization/pitting/electrochemical impedance spectroscopy/passivity引用本文复制引用
基金项目
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)
出版年
2024
NETL
NSTL
万方数据