混合稀土对α-Fe_(2)O_(3)晶体结构、形貌和耐蚀性能的影响研究  

Effects of Mixed Rare Earth on Crystal Structure,Morphology and Corrosion Resistance ofα-Fe_(2)O_(3)

作　　者：李威 史培阳 宁俊翔 郑力志 LI Wei;SHI Peiyang;NING Junxiang;ZHENG Lizhi(Key Laboratory for Ecological Metallurgy of Multimetallic Ores(Ministry of Education),School of Metallurgy,Northeastern University,Shenyang 110819,China;Academy of Fine Arts,Dalian Art College,Dalian 116600,China)

机构地区：[1]东北大学冶金学院多金属共生矿生态化冶金教育部重点实验室,沈阳110819 [2]大连艺术学院美术学院,辽宁大连116600

出　　处：《有色金属(中英文)》2025年第2期231-238,共8页Nonferrous Metals

基　　金：辽宁省科技计划联合计划(应用基础研究项目)(2023JH2/101700347);多金属共生矿生态化冶金教育部重点实验室开放项目(NEMM2019002)。

摘　　要：研究采用水热法合成了混合稀土掺杂的α-Fe_(2)O_(3)纳米颗粒(La/Ce-dopedα-Fe_(2)O_(3)),并研究了La和Ce对α-Fe_(2)O_(3)的晶体结构、形貌和耐蚀性能的影响。结果表明,制备的La/Ce-dopedα-Fe_(2)O_(3)具有多晶结构,La和Ce的掺杂引起α-Fe_(2)O_(3)晶体的晶格畸变,增强了晶体的稳定性。在3.5%NaCl溶液中,La/Ce-dopedα-Fe_(2)O_(3)的腐蚀电流密度为0.0005μA·cm^(-2),与α-Fe_(2)O_(3)(u)相比降低了10倍,腐蚀电位为-1.226 mV,且有钝化膜的生成,表现出更高的电化学稳定性。La/Ce-dopedα-Fe_(2)O_(3)在0.1 mol·L^(-1)NaNO_(3)溶液中表现出更好的酸碱缓冲能力,消耗氢离子总量[H^(+)]t=5.84 mmol·L^(-1)。这些结果表明,La和Ce共掺杂可以增强α-Fe_(2)O_(3)纳米颗粒的耐腐蚀性能。本研究结果对于稀土和氧化铁的高值化利用具有重要的参考价值和理论指导意义。This study employed the hydrothermal method to synthesize a mixed rare earth dopeα-Fe_(2)O_(3)nanoparticles(La/Ce-dopedα-Fe_(2)O_(3))and investigated the effects of the La and Ce on crystal structure,morphology,and corrosion resistance properties ofα-Fe_(2)O_(3).The results show that the prepared La/Ce-dopedα-Fe_(2)O_(3)has a polycrystalline structure,and the La and Ce doping caused lattice distortion in theα-Fe_(2)O_(3),enhancing the regularity of the crystal.In a 3.5%NaCl solution,the corrosion current density of La/Ce-dopedα-Fe_(2)O_(3)is 0.0005μA·cm^(-2),which is 10 times lower than that ofα-Fe_(2)O_(3)(u),and the corrosion potential is-1.226 mV,showing higher electrochemical stability.La/Ce-dopedα-Fe_(2)O_(3)also features a mesoporous structure on its surface,providing more spaces for adsorption and diffusion.It demonstrats better acid-base buffering capacity in 0.1 mol·L^(-1)NaNO_(3)solution,with a total consumption of hydrogen ions[H^(+)]t of 5.84 mmol·L^(-1).These findings indicate that the La and Ce co-doping enhance corrosion resistance properties ofα-Fe_(2)O_(3)nanoparticles.The results of this study provide valuable insight and theoretical guidance for high-value utilization of rare earth and iron oxide.

关 键 词：α-Fe_(2)O_(3)纳米颗粒 稀土改性 电化学稳定性 酸碱缓冲 

分 类 号：TB37[一般工业技术—材料科学与工程]