Electrochemical studies of general and localized corrosion processes

全面和局部腐蚀过程的电化学研究

• 批准号: 216950-2009
• 负责人: Shoesmith, David
• 金额: $ 2.91万
• 依托单位: University of Western Ontario
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2012
• 资助国家: 加拿大
• 起止时间: 2012-01-01 至 2013-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=497902
• 关键词: Electrochemical; studies; general; localized; corrosion

The primary aim of this research is to develop models to predict the evolution with time of industrially and environmentally important materials corrosion processes. Key areas of interest include corrosion of important materials in high level nuclear waste repositories and gas transmission pipeline steels. The primary goal of an environmental performance assessment model is the demonstration that the chosen scenario will meet the set regulatory goals. The primary goal of an industrial corrosion model is to either demonstrate that the system is fit to remain in service or to optimize the scheduling of maintenance operations for minimal process disturbance. In the majority of these applications oxide films and/or corrosion product deposits on the surface of the materials are the primary defense against corrosion. A thorough understanding of their properties and how they respond with time and exposure environment is essential if their use is to be justified. The primary focus of this proposal is the experimental development of the necessary mechanistic understanding and the determination of the values of essential model parameters. It is proposed that all aspects of localized corrosion processes be studied, from the properties of the films and deposits which must fail for localized processes to initiate, to the development of damage functions for specific corrosion processes, which describe how damage accumulates over the important exposure period. This will be achieved by coupling electrochemical techniques, which have a long history of application to these problems, with a range of novel surface analytical techniques which we have developed or adapted to these applications over the past few years. These include the novel coupling of electrochemical methods and neutron reflectometry and the adaptation of scanning electrochemical microscopy, a technique which can map inhomogeneously distributed corrosion sites.

这项研究的主要目的是开发模型，以通过工业和环境重要的材料腐蚀过程的时间来预测演变。关键的关键领域包括在高水平核废料存储库中腐蚀重要的材料和气体传输管道钢。环境绩效评估模型的主要目标是证明所选方案将符合设定的监管目标。工业腐蚀模型的主要目标是证明该系统适合保持服务，或优化维护操作的安排，以减少过程干扰。在大多数这些应用中，氧化物膜和/或材料表面上的腐蚀产物沉积物是腐蚀的主要防御。如果要证明使用它们的使用是合理的，那么对他们的特性及其在时间和暴露环境中的反应是必不可少的。该提案的主要重点是必要的机械理解的实验发展和确定基本模型参数的值。建议研究局部腐蚀过程的各个方面，从膜和沉积物的特性中，这些特性必须使本地化过程失败，到启动的局部过程，到为特定的腐蚀过程的损害功能的发展，这些损害功能描述了在重要的暴露期间的损害如何积累。这将通过耦合电化学技术来实现，这些技术在这些问题上具有悠久的应用历史，并且在过去几年中，我们已经开发或适应了这些应用的一系列新型的表面分析技术。其中包括电化学方法和中子反射量测定法的新型耦合以及扫描电化学显微镜的适应，该技术可以映射不均匀分布的腐蚀位点。