近室温离子液体电沉积钛及钛合金研究进展

Electrodeposition of titanium and titanium alloys in near-room-temperature ionic liquids

  • 摘要: 钛及钛合金因其优异的比强度、耐腐蚀性等,在航空航天、海洋工程等领域得到了广泛应用. 然而,传统的钛及钛合金制备工艺通常涉及高温、高能耗、高污染等问题. 近室温电解质体系电沉积技术能显著降低钛及钛合金制备的温度和能耗,但目前仍存在产物纯度不高、电流效率低等问题. 为此,本文系统综述了近室温体系电沉积钛及钛合金的发展历程,随后着重分析了近室温离子液体(ILs)体系电沉积钛及钛合金所面临的核心挑战,包括电沉积机理复杂、电沉积制备纯钛困难和产物品质调控困难等关键问题. 基于此,本文从电沉积机理解析、高效制备纯钛工艺、产物品质调控等多个角度,归纳总结了针对近室温ILs电沉积钛及钛合金的创新优化策略. 最后,对该技术未来发展面临的关键挑战与潜在机遇进行了探讨. 本文旨在为近室温ILs电沉积钛及钛合金的基础研究提供有价值的参考,并推动其大规模工业化应用的快速发展.

     

    Abstract: Titanium and its alloys are extensively used in aerospace, marine engineering, and various technical industries owing to their exceptional specific strength and superior corrosion resistance. Traditional methods of titanium production primarily fall into two categories: metallothermic reduction and molten salt electrolysis. However, both approaches rely on high-temperature conditions and face systemic challenges, such as stringent material requirements, high energy consumption, and substantial pollutant emissions. These issues pose significant obstacles to the transition of titanium metallurgy toward low-carbon and energy-efficient paradigms. In this context, near-room-temperature electrodeposition has garnered increasing attention as a promising alternative for its unique advantages. This technique substantially reduces energy consumption and pollution emissions as well as simplifies equipment design and operational complexity. Among the various electrolytes explored, ionic liquids (ILs) have emerged as a pivotal component due to their wide electrochemical windows, low melting points, and high stability. Despite significant advancements, critical challenges such as low current efficiency and insufficient product purity remain unresolved. Furthermore, comprehensive reviews focusing specifically on near-room-temperature electrodeposition of titanium and its alloys in IL-based systems are still lacking. Therefore, this article systematically reviews the development of near-room-temperature electrodeposition methods for titanium and its alloys in aqueous solutions, organic solvents, and ILs. Key technical challenges are analyzed, including the complex speciation of titanium in IL media, the intricate process of titanium ion electroreduction, and difficulties in achieving deep reduction and high current efficiency. The article analyzes the causes and manifestations of defects in electrodeposited products in terms of composition and morphology. In addition, this article comprehensively summarizes the recent innovative optimization strategies and explores the use of multi-scale theoretical analysis combined with multi-dimensional in-situ experimental characterization to elucidate the mechanism of electrodeposition. Furthermore, strategies for efficient electrodeposition of titanium and its alloys, including the design and development of novel ILs with excellent performance, analysis of electrode processes, and the implementation of corresponding optimization measures, aimed at enabling the deep reduction of titanium ions for electrodeposition of pure titanium and improving current efficiency, are discussed. An innovative control strategy for electrodeposition products based on multi-parameter and cross-spatiotemporal coupling regulation is also proposed. On this basis, the importance of establishing machine learning models to enable real-time prediction and control is also emphasized. Finally, this article looks forward to the future development challenges and potential opportunities in the electrodeposition of titanium and its alloys in near-room-temperature ILs. It aims to provide valuable guidance for fundamental research, offer theoretical support for technological breakthroughs, and facilitate the rapid development of large-scale industrial applications.

     

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