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

用于建造液体管道和泥浆系统的材料的冲刷腐蚀是电力和资源工业中造成经济损失和停工的主要原因。所提出的方法使用新的技术，以改善测量的材料损失率在射流冲击试验。将设计一个装置来研究微观尺度下的侵蚀腐蚀现象，以区分元素对原位侵蚀腐蚀的贡献。这是第一次，管线钢的微观结构将与它们的表面活性，在不同阶段的侵蚀腐蚀疤痕的发展，和局部电子转移速率，以深入了解机制。阵列电极将被构造为测量阳极电流密度分布的不均匀性，作为时间的函数的钢与一系列的微观结构的磨损疤痕。将确定局部流体动力学参数的影响，通过它们对疤痕上的冲刷腐蚀的贡献来研究机制。将建立一个新的冲刷腐蚀图，以展示冶金学对材料冲刷腐蚀机制转变的影响。将确定在不同的主要条件下的冲刷腐蚀和机理的控制因素。将开发一种新的模型，以更准确地预测流体动力学条件、材料的机械性能和冶金特征对腐蚀增强侵蚀的影响。因此，拟议的工作将推进侵蚀腐蚀中协同作用的过程的知识，深入了解机制和数据的开发，使工业能够更好地解决目前工业中因侵蚀腐蚀而产生的问题。 短期和长期目标将导致建立标准的指导方针，选择材料的泥浆系统和设备设计，开发新的耐侵蚀腐蚀材料，并优化操作条件，以控制侵蚀腐蚀。这将使工业能够更安全地操作含有腐蚀性液体和腐蚀性材料的设备，减少停机时间，从而降低运营成本。

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. Short and longer term objectives will lead to guidelines for establishing criteria for selecting materials for slurry systems and equipment design, developing new erosion-corrosion resistant materials, and optimizing operating conditions to control erosion-corrosion. That will enable industry to more safely operate equipment containing corrosive liquids and erosive materials, reduce downtime and hence reduce operating costs.