Electrochemical and Analytical Studies of Corroding and Reactive Surfaces

腐蚀和反应表面的电化学和分析研究

• 批准号: RGPIN-2014-06556
• 负责人: Shoesmith, David
• 金额: $ 7.29万
• 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: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=665090
• 关键词: Electrochemical; Analytical; Studies; Corroding; Reactive

Corrosion of materials is a major industrial and environmental issue with safety, environmental and major cost issues. The susceptibility of industrial materials to corrosion depends on a mixture of chemical, metallurgical and environmental factors. Localized corrosion (pitting, crevice corrosion, stress corrosion cracking) is particularly insidious since, while very little corrosion occurs, it is highly focussed at chemically and metallurgically vulnerable locations and can lead rapidly to structural failures. This makes it essential to understand both the corrosion mechanism and how the properties of the material influence damage distribution. The study of such processes requires a multidisciplinary approach involving chemical, metallurgical, physical and engineering techniques. The general goals of this research are to investigate the features that dictate susceptibility to localized corrosion, to determine how corrosion damage would be distributed, and to investigate the processes that might eventually lead to repassivation and the prevention of corrosion. Experimental techniques ranging from those able to resolve the mechanistic details of surface reactions at the atomic level to those able to determine the extent and location of materials damage over the scale of nanometers to centimeters will be applied. These techniques will range from electrochemical and surface analytical to analytical and microscopic. *With these goals in mind the following areas will be studied. (a) The properties of the oxide films on which metals rely for passivity will be investigated with an emphasis on nickel-chromium-molybdenum superalloys. A combination of electrochemical, X-ray photoelectron and Auger spectroscopic, and time-of flight secondary ion mass spectrometric techniques will be used. (b) The factors influencing the evolution of crevice corrosion damage on Ni superalloys will be studied using Raman spectroscopy and confocal laser scanning microscopy. (c) The development and application of microscopic techniques (especially electron backscatter diffraction and atomic probe field-ion microscopy) will be undertaken to characterize corrosion controlling physical and chemical processes. (d) Key properties of oxide films and their metal substrates which are unavailable by other techniques will be determined using an in-situ combination of electrochemistry and neutron reflectometry. These properties include the dielectric constant, absolute film thickness and hydrogen content. Studies will concentrate on titanium and zirconium, the latter being an important in-reactor nuclear material. (d) The corrosion mechanisms occurring on gas transmission pipelines in sulphide-containing aqueous environments will be studied electrochemically using in-situ Raman spectroscopy. The primary goal is to determine how film properties change with the various pipeline exposure conditions.

材料的腐蚀是安全，环境和主要成本问题的主要工业和环境问题。工业材料对腐蚀的敏感性取决于化学，冶金和环境因素的混合物。局部腐蚀（斑点，缝隙腐蚀，应力腐蚀开裂）特别是阴险的，因为虽然发生了很少的腐蚀，但它高度关注化学和冶金易受伤害的位置，并且可以迅速导致结构性故障。这使得了解腐蚀机制以及材料的性质如何影响损伤分布至关重要。对此类过程的研究需要一种涉及化学，冶金，物理和工程技术的多学科方法。这项研究的一般目标是调查决定局部腐蚀易感性的特征，以确定如何分配腐蚀损伤，并调查最终可能导致重新激活和预防腐蚀的过程。实验技术从能够解决原子水平的表面反应的机械细节到能够确定纳米尺度上材料损伤的程度和位置的实验技术，将应用于厘米。这些技术的范围从电化学和表面分析到分析和显微镜。 *考虑到这些目标，将研究以下领域。 （a）将研究金属依赖于被动性的氧化物膜的性质，重点是镍铬 - 莫利布尔果超合金。将使用电化学，X射线光电子和螺旋光谱以及飞行时间次级离子质谱技术的组合。 （b）将使用拉曼光谱和共聚焦激光扫描显微镜研究影响NI超合金的裂缝腐蚀损伤演变的因素。 （c）将开发和应用显微镜技术（尤其是电子反向散射衍射和原子探针场离子显微镜），以表征控制物理和化学过程的腐蚀。 （d）使用电化学和中子反射测量法的原位组合确定氧化膜及其金属底物的关键特性。这些特性包括介电常数，绝对膜厚度和氢含量。研究将集中于钛和锆，后者是重要的反应内核材料。 （d）将使用位于原化的拉曼光谱法对含硫化水性环境的气体传输管道上发生的腐蚀机制进行研究。主要目标是确定膜特性如何随着各种管道暴露条件而变化。