Electrochemical atomic force microscope for in-situ measurement and imaging of pitting corrosion in pipeline steels

用于管线钢点蚀原位测量和成像的电化学原子力显微镜

• 批准号: 458659-2014
• 负责人: Cheng, Frank
• 金额: $ 10.93万
• 依托单位: University of Calgary
• 依托单位国家: 加拿大
• 项目类别: Research Tools and Instruments - Category 1 (<$150,000)
• 财政年份: 2013
• 资助国家: 加拿大
• 起止时间: 2013-01-01 至 2014-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=542000
• 关键词: Electrochemical; atomic; force; microscope; situ

Pitting corrosion has been demonstrated to be one of the dominant mechanisms resulting in pipeline failure. In addition to the coating performance, cathodic protection and the environmental conditions, the occurrence of pitting corrosion on pipelines depends strongly on metallurgical features of the steel. Recently, the rapidly increasing energy demand has driven development of high-strength pipeline steels, such as X80 and X100 steels. The unique metallurgical microstructure of high-strength steels is quite different from that of the low grade steels. It is expected that these metallurgical features are associated with electrochemical heterogeneities, and thus affect the pit initiation and growth mechanisms and kinetics. To date, research in the effect of steel metallurgy on pitting corrosion of pipelines has remained macroscopic and statistical, and is not able to advance the understanding of this phenomenon mechanistically.

点蚀已被证明是导致管道失效的主要机制之一。除了涂层性能、阴极保护和环境条件外，管道上点腐蚀的发生在很大程度上取决于钢的冶金特征。近年来，快速增长的能源需求推动了高强度管线钢的发展，如X80和X100钢。高强度钢独特的金相组织与低等级钢有很大的不同。预计这些冶金特征与电化学不均匀性有关，从而影响点蚀的产生和生长机制及动力学。迄今为止，钢铁冶金对管道点蚀影响的研究仍然停留在宏观和统计上，无法从机理上加深对这一现象的认识。