CAREER: Resolving the origins of microgalvanic corrosion on metal surfaces

职业：解决金属表面微电偶腐蚀的根源

• 批准号: 1945650
• 负责人: Michael Hurley
• 金额: $ 50万
• 依托单位: Boise State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-07-01 至 2025-06-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1945650&HistoricalAwards=false
• 关键词: CAREER; Resolving; origins; microgalvanic; corrosion

Non-Technical SummaryCorrosion (rust) is an age-old metallurgical problem whose underlying mechanisms are still not well-understood. The purpose of this research program is to uncover these hidden mechanisms and fully understand rust by using state-of-the-art instruments that allow us to see metals rust in liquids at the nanometer scale. By understanding the complex interplay between a material and its environment, transformative outcomes include an a priori approach for predicting and assessing corrosion, and a fundamental framework enabling engineers to design materials with superior corrosion resistance. Being able to control rust has far-reaching implications, from enabling ultra-light alloy design for aerospace applications, to materials for critical infrastructure, such as power generation, transportation, communications, defense, and water and waste treatment facilities. An integrated education plan extends the impact of this research by educating the next generation of corrosion engineers. Educational activities will benefit students from high school to graduate school, while providing opportunities for underserved and minority students to contribute to solving problems of national significance. Technical SummaryEngineers design and process most engineering alloys to precipitate secondary phases; while these phases strengthen the alloy, they also act as the thermodynamic driving force for corrosion initiation. Inherent corrosion resistance can be tailored by selecting alloy constituents and processing routes to optimize fundamental electrochemical properties, but the appropriate constituents and processing routes are known only for select material systems and perform only under specific environmental conditions. How to expand beyond these systems to other materials and environments is still a tedious trial-and-error process. To address this limitation and advance the fundamental science needed to design for superior corrosion performance, this research connects the electrode potential of magnesium-lithium (Mg-Li) alloys in solution to their electronic structure by integrating state-of-the-art scanning Kelvin probe force microscopy (SKPFM) and scanning electrochemical microscopy (SECM) with first principles electronic property simulations. Using SKPFM to measure Volta potential (a surface electronic property) provides an experimental link spanning atomic structure and macroscale electrochemical properties via the work function. In complement, SECM quantifies the surface reaction kinetics during corrosion. Altogether, this research provides a new theoretical framework for relating local composition and structure to electrochemical properties--a critical factor governing material operational lifetimes.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

非技术概述腐蚀（生锈）是一个古老的冶金问题，其基本机制仍不清楚。 这项研究计划的目的是揭示这些隐藏的机制，并通过使用最先进的仪器来充分了解生锈，这些仪器使我们能够在纳米级的液体中看到金属生锈。通过了解材料与其环境之间的复杂相互作用，变革性成果包括预测和评估腐蚀的先验方法，以及使工程师能够设计具有上级耐腐蚀性的材料的基本框架。能够控制生锈具有深远的影响，从航空航天应用的超轻合金设计，到关键基础设施的材料，如发电，运输，通信，国防以及水和废物处理设施。综合教育计划通过教育下一代腐蚀工程师来扩大这项研究的影响。教育活动将使从高中到研究生院的学生受益，同时为得不到充分服务的学生和少数民族学生提供机会，帮助解决具有国家意义的问题。 技术总结工程师设计和加工大多数工程合金以沉淀第二相;虽然这些相强化合金，但它们也作为腐蚀引发的热力学驱动力。通过选择合金成分和工艺路线可以定制固有的耐腐蚀性，以优化基本的电化学性能，但仅已知适当的成分和工艺路线用于选择材料系统，并且仅在特定的环境条件下执行。如何将这些系统扩展到其他材料和环境仍然是一个繁琐的试错过程。为了解决这一局限性，并推进设计上级腐蚀性能所需的基础科学，本研究通过将最先进的扫描开尔文探针力显微镜（SKPFM）和扫描电化学显微镜（SECM）与第一原理电子性质模拟相结合，将镁锂（Mg-Li）合金在溶液中的电极电位与其电子结构联系起来。使用SKPFM测量伏打电位（表面电子性质）提供了一个实验链接，通过功函数跨越原子结构和宏观电化学性质。作为补充，SECM量化了腐蚀过程中的表面反应动力学。总而言之，这项研究提供了一个新的理论框架，将局部组成和结构与电化学性能联系起来--这是决定材料使用寿命的关键因素。该奖项反映了NSF的法定使命，并被认为值得通过使用基金会的知识价值和更广泛的影响审查标准进行评估来支持。

项目成果

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

优化磁力显微镜分辨率和灵敏度以可视化纳米级磁域

• DOI: 10.3791/64180
• 发表时间: 2022
• 期刊: Journal of Visualized Experiments
• 作者: Parker, Audrey C.;Maryon, Olivia O.;Kaffash, Mojtaba T.;Jungfleisch, M. Benjamin;Davis, Paul H.
• 通讯作者: Davis, Paul H.

Co-localizing Kelvin Probe Force Microscopy with Other Microscopies and Spectroscopies: Selected Applications in Corrosion Characterization of Alloys

开尔文探针力显微镜与其他显微镜和光谱的共定位：合金腐蚀表征中的选定应用

• DOI: 10.3791/64102
• 发表时间: 2022
• 期刊: Journal of Visualized Experiments
• 作者: Maryon, Olivia O.;Efaw, Corey M.;DelRio, Frank W.;Graugnard, Elton;Hurley, Michael F.;Davis, Paul H.
• 通讯作者: Davis, Paul H.