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Review on modelling of corrosion under droplet electrolyte for predicting atmospheric corrosion rate

Journal of Materials Science & Technology 2021年第3期62卷 254-267页

作者： Bangalore Gangadharacharya Koushik n.ls van.den.steen.mesﬁn.haile mamme Yves van Ingelgem Herman Terryn Vrije Universiteit Brussel Research Group Electrochemical and Surface Engineering(SURF)Pleinlaan 21050 BrusselsBelgium Vrije Universiteit Brussel Eenheid Algemene Chemie(ALGC)Pleinlaan 21050 BrusselsBelgium

Atmospheric corrosion of metals is the most common type of corrosion which has a significant impact on the environment and operational safety in various situations of everyday *** of the common examples can be observed in land,water and air transportation systems,electronic circuit boards,urban and offshore *** dew drops formed on metal surface due to condensation of atmospheric moisture facilitates corrosion as an *** corrosion mechanisms under these droplets are different from classically known bulk electrolyte *** to thin and non-uniform geometric thickness of the droplet electrolyte,the atmospheric oxygen requires a shorter diffusion path to reach the metal *** corrosion under a droplet is driven by the depletion of oxygen in the center of the droplet compared to the edge,known as differential *** case of a larger droplet,differential aeration leads to preferential cathodic activity at the edge and is controlled by the droplet ***,for a smaller droplet,the oxygen concentration remains uniform and hence cathodic activity is not controlled by droplet *** geometry of condensed droplets varies dynamically with changing environmental parameters,influencing corrosion mechanisms as the droplets evolve in *** this review,various modelling approaches used to simulate the corrosion under droplet electrolytes are *** the efforts of developing a comprehensive model to estimate corrosion rates,it has been noted from this review that the influence of geometric evolution of the droplet due to condensation/evaporation processes on corrosion mechanisms are yet to be *** varying external factors like environmental temperature,relative humidity,presence of hygroscopic salts and pollutants influence the evolution of droplet electrolyte,making it a complex phenomenon to ***,an overview of available dropwise condensation and evaporation models which descri

关键词： Atmospheric corrosion Water droplets Mathematical modelling Condensation Evaporation

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