Abstract Erosion-corrosion, the combined loss of material due to combined effects of particle erosion and electrochemical corrosion, has due to its complexity largely evaded modeling efforts. Assessment of the synergy between erosion and corrosion leading in extreme conditions to far greater material losses than for the mechanisms individually has proven elusive. Various analytical and semi-empirical approaches have been proposed with varying degree of success, but it has been a typical outcome that the predictive capabilities or transferability of such modeling efforts have been less than desirable. In current work this aspect is addressed and improvement is seeked by introducing a concept merging computational fluid dynamics (CFD) and the point defect model (PDM) to a micromechanical finite element (FE) formulated wear model. The implemented approach is utilized to study erosion-corrosion in a stirring tank configuration where flow velocity, abrasive particle type, solution chemistry, temperature and pH are varied. In order to investigate model performance experimental work supplemented by a detailed characterization regime is performed to produce a dataset for model validation for a wear resistant steel with two different abrasives, quartz and chromite particles. The respective experiments indicative of industrially relevant erosion-corrosion conditions are modelled and the Results are directly compared to model predictions. The erosion-corrosion model is found to produce satisfactory results in relation to the validation tests and predict the main trends of the experimental dataset appropriately. The capabilities and approximations underlying the introduced erosion-corrosion model are evaluated, discussed and future development needs identified.

中文翻译：

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不同pH环境下耐磨钢侵蚀-腐蚀耦合模型的开发与验证

摘要 侵蚀-腐蚀是由于颗粒侵蚀和电化学腐蚀的综合影响而造成的材料综合损失，由于其复杂性，在很大程度上避免了建模工作。评估侵蚀和腐蚀之间的协同作用导致极端条件下比单独的机制更大的材料损失已被证明是难以捉摸的。已经提出了各种分析和半经验方法，并取得了不同程度的成功，但典型的结果是，此类建模工作的预测能力或可转移性不尽如人意。在当前的工作中，通过将计算流体动力学 (CFD) 和点缺陷模型 (PDM) 合并到微机械有限元 (FE) 公式化磨损模型中的概念，解决了这一方面并寻求改进。所实施的方法用于研究流动速度、磨料颗粒类型、溶液化学、温度和 pH 值变化的搅拌罐配置中的侵蚀腐蚀。为了研究模型性能实验工作，并辅以详细的表征机制，以生成数据集，用于对具有两种不同磨料（石英和铬铁矿颗粒）的耐磨钢进行模型验证。对指示工业相关侵蚀-腐蚀条件的各个实验进行建模，并将结果直接与模型预测进行比较。发现侵蚀-腐蚀模型在验证测试方面产生了令人满意的结果，并适当地预测了实验数据集的主要趋势。