Galvanic current analysis of AA6016/SM490 couple using experimental and numerical simulation data in various NaCl solutions

Kadowaki, Mariko; Katayama, Hideki; Yamamoto, Masahiro

doi:10.1016/j.corsci.2022.110918

Cited by 10 publications

(4 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand, according to Kadowaki et al [41,65], the total of both the internal anodic and cathodic currents should be equal for the entire galvanic couple. Based on this, a decrease in NaCl concentration results in an imbalance between these anodic and cathodic currents, which leads to the presence of an anodic current component in the metal which initially acts as the cathode in the electrochemical reaction.…”

Section: Resultsmentioning

confidence: 99%

“…The exposure of the AA7075-CS1018 couple to various NaCl solutions results in a notable generation of bubbles located beneath the gel electrolyte. These bubbles can be associated with the reduction of H − to produce H 2 due to the increase in cathodic current in AA7075 caused by the self-corrosion of CS1018 [41,65] and/or the negative difference effect present in aluminum and magnesium alloys [66][67][68]. Additionally, the solution can directly contact the aluminum by rupturing the passive film, leading to hydrogen evolution [69].…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

The AA7075–CS1018 Galvanic Couple under Evaporating Droplets

Montoya,

Genesca,

Montoya

2024

CMD

View full text Add to dashboard Cite

The galvanic corrosion behavior of the AA7075–CS1018 couple was examined in dynamic electrolytes using the ZRA technique. A modified electrochemical setup was developed to support the use of thin-film gel and liquid electrolytes on metallic surfaces. This allowed the collection of chemical information, left behind by the liquid electrolyte during evaporation, through a thin-film gel. The analysis of the gel electrolyte film confirmed the acidification on AA7075 and the alkalinization on CS1018 but also offered novel insights on their dependence on the galvanic current. The galvanic current was proportional to the initial NaCl concentration in the range of 0.01 to 0.06 M. However, due to continuous evaporation, the NaCl concentration increased, limiting oxygen diffusion and decreasing the galvanic current, especially for electrolytes exceeding 0.06 M. The galvanic current was determined by considering the dynamic evolution (caused by the evaporation of the electrolyte film) of both the thickness of the electrolyte and its concentration.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

The AA7075–CS1018 Galvanic Couple under Evaporating Droplets

Montoya,

Genesca,

Montoya

2024

CMD

View full text Add to dashboard Cite

show abstract

“…On the other hand, the results obtained by Montoya et al establish that at low NaCl concentration, the acidification over the aluminum alloy surface is faster and more drastic because the competition between the Cl À and OH À ions enhance the hydrolysis of Al 3 + ions in the electrolyte. [35] It is well known that pits appeared when the pH decreases; this may explain the formation of pits over both surfaces of the galvanic couple and the predominance of self-corrosion observed by Kodowaki et al [43]…”

Section: Bulk Conditionsmentioning

confidence: 94%

“…Recently, Kadowaki et al investigated the effect of NaCl concentration over the galvanic and self-corrosion of the AA6016/SM490 couple using experimental data and FEM simulations performed on the COMSOL Multiphysics software. [43] The Nernst-Planck equations were used, and the boundary conditions were established with potentiodynamic polarization experiments. The study concluded that the corrosion behavior of the AA6016/SM490 couple changed with varying NaCl concentrations.…”

Section: Bulk Conditionsmentioning

confidence: 99%

Corrosion Modeling of Aluminum Alloys: A Brief Review

Ruiz‐Garcia,

Esquivel‐Peña,

Godínez

et al. 2024

ChemElectroChem

View full text Add to dashboard Cite

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.

show abstract