Validation of predictive model for galvanic corrosion under thin electrolyte layers: An application to aluminium 2024-CFRP material combination

Palani, Sarangapani; Hack, T.; Deconinck, Johan; Lohner, H.

doi:10.1016/j.corsci.2013.09.003

Cited by 72 publications

(60 citation statements)

References 30 publications

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“…Similar trends have been reported from experiment as well as modeling. 8,21,40 The particular values of the slope and the intercept for this linear fit vary from study to study as the quantitative parameters are determined by the specific kinetics considered. For instance, Palani et al 21 considered ORR kinetics on carbon fiber reinforced polymer in contrast to this work on 316L stainless steel.…”

Section: Discussionmentioning

confidence: 99%

“…8,21,40 The particular values of the slope and the intercept for this linear fit vary from study to study as the quantitative parameters are determined by the specific kinetics considered. For instance, Palani et al 21 considered ORR kinetics on carbon fiber reinforced polymer in contrast to this work on 316L stainless steel. This linear relationship between I cath and log WL was also present across similar film thicknesses in the work of McCafferty data 40 as well as the finite element modeling study by Morris and Smyrl; 8 however, the polarization parameters considered in those studies were extracted in the linear limit of kinetics near the open circuit potential.…”

Section: Discussionmentioning

confidence: 99%

“…This quantitative control of the diffusional boundary layer avoids some of the difficulties inherent in making electrochemical measurements in thin electrolyte layers. 14,29 Panali et al 21 used electrochemical kinetics of both AA2024 and CFRP generated with RDE as boundary conditions in their modeling of galvanic corrosion between AA2024 and CFRP under a thin layer of electrolyte with varying thickness. In the present study, the RDE was utilized to achieve two goals: RDE testing on Pt was used to determine the critical water layer thickness beyond which natural convection controls the diffusional boundary layer; RDE testing of SS 316L at different rotation speeds was used to determine the effects of both water layer thickness and oxide film on cathodic limiting current density.…”

Section: C846mentioning

confidence: 99%

“…Attempts to develop a rigorous study of this dependence have since been made by a number of researchers. [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] Nishikata et al, 14,15 in their experimental studies on the oxygen reduction reaction (ORR) cathodic kinetics of both iron and platinum under an electrolyte thin film, observed a one-dimensional, Fickian relationship between the limiting current density for ORR and the film * Electrochemical Society Student Member.* * Electrochemical Society Fellow. z E-mail: rgk6y@virginia.edu thickness over the range 20 μm to 1 mm.…”

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confidence: 99%

“…Recently there have been modeling studies [18][19][20][21][22][23][24] that have focused on corrosion under an electrolyte thin film instead of full immersion. Dolgikh et al 24 performed a combined experimental and modeling study which incorporated the idea that convective flux could be expressed in terms of an analogous diffusion term.…”

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Editors' Choice—Electrolyte Film Thickness Effects on the Cathodic Current Availability in a Galvanic Couple

Liu

Srinivasan

Kelly

2017

J. Electrochem. Soc.

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A combined modeling and experimental study was performed to understand the dependence of the cathodic current delivery capacity on the electrolyte film thickness and cathode size in a galvanic couple. The appropriate cathodic kinetics for the modeling were generated by use of a rotating disk electrode to simulate the electrolyte film thickness. These results provided boundary conditions for a finite element model which calculated the potential distribution along a metallic surface and the associated cathodic current supplied for electrolyte layers of varying thickness. The total cathodic current was then calculated through integration of the current density across the surface. Electrolyte layer domains were delineated by three limits which described, in order of decreasing film thickness, i) transition in exposure condition from full immersion to thick film, ii) the hydrodynamic boundary layer due to natural convection which defined the upper limit of the thin film regime, and iii) the relative dominance of ohmic resistance over mass transport in determining the total current output. This study also showed that for sufficiently thin films, this total current was independent of the size of the cathode and the nature of kinetics at the electrochemical interface, being solely driven by the ohmic resistance in solution. Dissimilar engineering alloys in close proximity and in electrical contact are frequently encountered in the architecture of high-value structural assets in the transportation, aerospace, and marine industries. In service, these structures are often exposed to atmospheric environments, such as sea spray, that result in the formation of a thin electrolyte layer on the surface sufficient to allow the dissimilar alloys to form galvanic couples. Under atmospheric conditions, the electrolyte can also form via deliquescence of salt as either a droplet or a thin film on the alloy surface, leading to the establishment of a corrosion cell. The extent of galvanic corrosion on the anode that results depends on a number of environmental, physicochemical, and geometric variables, which include relative humidity, temperature, electrolyte conductivity, electrolyte film thickness, in addition to the electrochemical kinetics on the alloy surface.1-7 Different exposure conditions can be modeled by varying the thickness of the electrolyte film (also termed the water layer, WL), which in turn affects solution resistance as well as cathodic kinetics, thus having a direct effect on the total cathodic current available to support corrosion of the galvanic system.The effects of the electrolyte film thickness on corrosion rate were recognized initially by Tomashov, 2 who qualitatively identified four regions of WL corresponding to different types of reaction control. As film thickness decreased, a transition from a plateau in corrosion rate when a constant diffusion layer was attained (conditions of full immersion) to cathodically controlled corrosion limited by diffusion of dissolved oxygen to the reaction surface (the corr...

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: C846mentioning

confidence: 99%

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confidence: 99%

mentioning

confidence: 99%

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Editors' Choice—Electrolyte Film Thickness Effects on the Cathodic Current Availability in a Galvanic Couple

Liu

Srinivasan

Kelly

2017

J. Electrochem. Soc.

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Corrosion and Its Context in Service Life

Zander

Höche

Deconinck

et al. 2016

Handbook of Software Solutions for ICME

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Corrosion Modeling of Aluminum Alloys: A Brief Review

Ruiz‐Garcia,

Esquivel‐Peña,

Godínez

et al. 2024

ChemElectroChem

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Corrosion remains a critical concern in various industries, particularly in applications involving aluminum alloys due to their widespread usage as light structural materials. This work provides a comprehensive overview of the recent advances in modeling techniques for better understanding the corrosion behavior of aluminum alloys. The present study encompasses the state‐of‐the‐art of computational approaches, highlighting their strengths and limitations. Special attention is given to transport models, galvanic couples, localized corrosion, and the incorporation of different factors, such as pH variations, electrolyte thicknesses and dynamic electrolytes into corrosion models. Furthermore, the review delves into both bulk and atmospheric corrosion models. On the other hand, this work also emphasizes a clear differentiation between models designed for bare aluminum alloys and those tailored for coated ones. Additionally, it addresses certain challenges associated with the experimental validation of such models. This review concludes with perspectives on both sophisticated transport models to bridge the gap between industrial and academic investigations, as well as the integration of machine learning and artificial intelligence techniques in corrosion modeling, offering promising directions for future research in this field.

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Validation of predictive model for galvanic corrosion under thin electrolyte layers: An application to aluminium 2024-CFRP material combination

Cited by 72 publications

References 30 publications

Editors' Choice—Electrolyte Film Thickness Effects on the Cathodic Current Availability in a Galvanic Couple

Editors' Choice—Electrolyte Film Thickness Effects on the Cathodic Current Availability in a Galvanic Couple

Corrosion and Its Context in Service Life

Corrosion Modeling of Aluminum Alloys: A Brief Review

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