首页|高温氯化盐体系中将炭素阳极转变为惰性析氧阳极的钛酸钙缓蚀剂

高温氯化盐体系中将炭素阳极转变为惰性析氧阳极的钛酸钙缓蚀剂

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采用多种分析技术,包括线性扫描伏安法、X射线衍射、扫描电镜和能量色散光谱,研究CaTiO3缓蚀剂在熔融盐体系中的缓蚀功效.当炭素阳极在添加CaTiO3缓蚀剂的CaCl2-CaO电解体系中使用时,表面发生钝化并且生成一层致密的CaTiO3氧化膜.钝化炭素电极发生析氧反应,最佳钝化电流密度为400 mA/cm2.通过CaTiO3在CaCl2-CaO体系中的溶解度实验及阴离子配合能力模拟计算发现,CaTiO3缓蚀剂的钝化机理为"配合溶解-沉淀",该过程中CaTiO3与CaO结合形成TiO2·nCaO配合物,随后配合物在炭素阳极表面形成CaTiO3氧化膜.实际应用中可利用炭素阳极和CaTiO3缓蚀剂实现无碳污染FeCoNiCrMn高熵合金的成功制备.
Calcium titanate corrosion inhibitor enabling carbon as inert anode for oxygen evolution in molten chlorides
The corrosion inhibition efficacy of titanate(CaTiO3)for carbon anodes in molten salts was investigated through various analytical techniques,including linear sweep voltammetry,X-ray diffraction,scanning electron microscopy,and energy dispersion spectroscopy.The results demonstrate that the addition of CaTiO3 corrosion inhibitor efficiently passivates the carbon anode and leads to the formation of a dense CaTiO3 layer during the electrolysis process in molten CaCl2-CaO.Subsequently,the passivated carbon anode effectively undergoes the oxygen evolution reaction,with an optimal current density for passivation identified at 400 mA/cm2.Comprehensive investigations,including CaTiO3 solubility tests in molten CaCl2-CaO and numerical modeling of the stability of complex ionic structures,provide compelling evidence supporting"complexation-precipitation"passivation mechanism.This mechanism involves the initial formation of a complex containing TiO2·nCaO by CaTiO3 and CaO,which subsequently decomposes to yield CaTiO3,firmly coating the surface of the carbon anode.In practical applications,the integration of CaTiO3 corrosion inhibitor with the carbon anode leads to the successful preparation of the FeCoNiCrMn high-entropy alloy without carbon contamination in the molten CaCl2-CaO.

corrosion inhibitorcalcium titanatecarbon anodeoxygen evolution reaction

杜开发、李闻淼、汪沛霖、郭磊、陈迪、马永松、余锐、尹华意、汪的华

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武汉大学资源与环境科学学院,武汉 430072

湖北省资源与能源可持续利用技术示范型国际科技合作基地,武汉 430072

缓蚀剂 钛酸钙 炭素阳极 析氧反应

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaInternational Science and Technology Cooperation Program of ChinaChina Postdoctoral Science Foundation

52031008518742112167316251325102U22B20712015DFA907502020M682468

2024

10.1016/S1003-6326(24)66616-1

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCD
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2024.34(10)