Synergistic effect of electrochemical and mechanical factors on erosion-corrosion in flowing slurries

用于建造液体管道和浆料系统的材料的冲刷腐蚀是电力和资源行业造成经济损失和停机的主要原因。该方法利用新技术改进了射流冲击试验中材料损失率的测量。将设计一套装置，在微观尺度上研究冲刷腐蚀现象，以区分现场冲刷腐蚀的元素贡献。首次将管线钢的微观组织与其表面活性、冲刷腐蚀不同阶段的结疤发展和局部电子转移速率相关联，以深入了解其机理。将构建阵列电极，以测量具有一系列微结构的钢在磨痕上的阳极电流密度随时间的不均匀分布。将确定局部水动力参数的影响，以通过它们对疤痕的冲刷腐蚀的贡献来研究其机理。建立了一个新的冲刷-腐蚀图，以显示冶金效应对材料冲刷-腐蚀机制转变的影响。将确定不同流行条件下冲刷腐蚀的控制因素和机理。将开发一种新的模型，以更准确地预测水动力条件、材料的力学性能和冶金特性对腐蚀增强冲刷的影响。因此，拟议的工作将促进对冲刷腐蚀过程中协同作用的了解，对冲刷腐蚀机理的洞察，以及数据的开发，使工业能够更好地解决目前工业中冲刷腐蚀产生的问题。

Erosion-corrosion of materials used to construct liquid pipelines and slurry systems results in the major cause of financial losses and downtime in power and resource industries. The proposed approach uses new techniques to improve measurement of the material loss rate in jet impingement tests. A set-up will be designed to investigate erosion-corrosion phenomena in micro-scale, to distinguish elemental contributions to erosion corrosion in-situ. For the first time, the microstructure of pipeline steels will be correlated to their surface activities, scar development at different stages of erosion-corrosion, and localized electron transfer rates to gain insight into the mechanism. Array electrodes will be constructed to measure the non-uniformity of distributions of anodic current densities over a wear scar as a function of time for steels with a range of microstructures. Effects of local hydrodynamic parameters will be determined to investigate the mechanism through their contributions to erosion-corrosion over scars. A new erosion-corrosion map will be built to demonstrate the metallurgical effects on the erosion-corrosion mechanism transitions of materials. The controlling factors for erosion-corrosion and mechanisms under different prevailing conditions will be determined. A new model will be developed to more accurately predict the effects of hydrodynamic conditions, mechanical properties and metallurgical features of the materials on corrosion-enhanced erosion. Thus, the proposed work will advance the knowledge of the processes that are synergistic within erosion-corrosion, insights into the mechanisms, and development of data to enable industry to better address the present problems arising in industry from erosion-corrosion.