Abstract
Thin film corrosion is a serious issue in almost every sector. Thus, simulation of corrosion under thin electrolyte films has always been of high interest as experimental studies are often challenging. Thus far, progress has been made to model the effect of several important factors on thin film corrosion rates. Some of these parameters are electrolyte thickness, electrolyte composition, chemical reactions in the electrolyte, electrode size and change in electrode size, environmental parameters, and corrosion products deposition. However, these parameters are mainly drawn from different studies and have not been modelled concurrently in a single simulation study, making the thin film corrosion model far from being complete yet. Therefore, despite the many efforts so far, thin film corrosion modelers still strive to push the modelling edges further. This paper takes into account some of the highlighted recent advances in thin film corrosion modelling based on the mentioned parameters to provide a perspective on not only how far the field has come, but also how far it still is from a complete thin film corrosion model. Discussions have also been made on future needs and prospects to advance the thin film corrosion models further.
Highlights
The advent of the Finite Element Method (FEM) opened a new horizon for numerical simulation studies
In FEM, a physical phenomenon is described by a series of partial differential equations (PDEs) over an interested discretized domain or a series of domains
Taking into account some of the highlighted recent advances in thin film corrosion FEM modelling, this paper aims at providing a perspective on how far the field has come, and how far it still is from a complete thin film corrosion model, along with what needs to be included to advance the models further
Summary
The advent of the Finite Element Method (FEM) opened a new horizon for numerical simulation studies. Corrosion modelers smartly have benefitted from FEM as it is able to provide more solution flexibility in terms of dealing with problem complexities [2]. Speaking of problem complexity in corrosion modelling studies, the case of atmospheric corrosion will be highlighted in more detail. The NP equation is regarded as the most complete means to solve transient problems in electrochemical systems, as it yields the concentration gradient, electrolyte current density, and electrolyte potential distribution. It is worth noting that this paper focuses on atmospheric corrosion as a complex form of thin film corrosion, it could still be applicable in other areas where a thin film of corrosive electrolyte. Internal corrosion of oil and gas pipelines—where the fluid is wet—or cooling systems such as cooling towers and heat exchangers or external corrosion of pipelines under disbonded coatings are all likely to occur under a thin layer of electrolyte [8]
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