Etching Microstructures on Metals

蚀刻金属上的微观结构

• 批准号: 9307308
• 负责人: Kurt Hebert
• 金额: $ 36.47万
• 依托单位: Iowa State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-12-15 至 1998-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9307308&HistoricalAwards=false
• 关键词: Etching; Microstructures; Metals

9307308 Hebert This research examines the mechanism of surface pitting in aluminum alloys. Surface impurity concentration is varied by annealing and surface dissolution treatments to asses the effect on pit density. Surface impurity and defect concentrations are monitored through surface analytical techniques, including Rutherford Backscattering Spectroscopy, Secondary Ion Mass Spectroscopy, and positron annihilation measurements. Relationships between the importance of candidate defects (e.g., vacancy/impurity clusters, dislocations, surface roughness) as corrosion sites are sought. Early stages of pit initiation are examined through the interaction of chloride ions with aluminum oxide films. The positron measurements are carried out as a function of temperature in order to provide defect migration or bonding energies so that the atomic structure of the defects can be characterized. These measurements are performed on high purity aluminum doped with impurity elements to determine how various impurities behave as corrosion sites. %%% Practical information should result from this research that will assist in controlling corrosion of aluminum and its alloys. ***

9307308赫伯特这项研究探讨了铝合金表面点蚀的机理。表面杂质浓度通过退火和表面溶解处理来改变，以评估对凹坑密度的影响。表面杂质和缺陷浓度通过表面分析技术进行监测，包括卢瑟福背散射光谱、二次离子质谱仪和正电子湮没测量。寻求候选缺陷(例如，空位/杂质簇、位错、表面粗糙度)作为腐蚀位置的重要性之间的关系。通过氯离子与氧化铝薄膜的相互作用，研究了凹坑形成的早期阶段。正电子测量是作为温度的函数进行的，以便提供缺陷迁移或成键能，从而可以表征缺陷的原子结构。这些测量是在掺杂了杂质元素的高纯铝上进行的，以确定各种杂质作为腐蚀部位的行为。这项研究应提供有助于控制铝及其合金腐蚀的实用信息。***