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The AA2024/CFRP Galvanic Couple Under A Dynamic Electrolyte Drop

Picture for The AA2024/CFRP Galvanic Couple Under A Dynamic Electrolyte Drop
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The gap between fully immersed and ultra-thin film electrochemical measurements is wide, which suggests that the two conditions are independent of one another. There is a lot of work describing experiments, results, and trends regarding completely immersed electrochemical tests. However, in corrosion tests under thin electrolyte films, the information is not so abundant. A classical three-electrode cell used in conventional electrochemical tests cannot easily be scaled for immersion in electrolytes of micron thickness.

Product Number: 51322-17686-SG
Author: R. Montoya, E. García-Lecina, J.M. Vega-Vega, J. Genesca
Publication Date: 2022
Industries: Corrosion Monitoring and Control , Coatings and Linings , Coatings
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The galvanic interactions between AA2024 and Carbon Fiber Reinforced Polymer under a dynamic drop of NaCl electrolyte were studied. The use of a dynamic electrolyte provided the unique opportunity to investigate both thick and ultra-thin electrolyte systems. A modeling approach was achieved by solving the Nernst-Planck equations in a 2D dynamic domain. Two kinds of boundary conditions were considered: electrochemical and physicochemical. Huge differences were found in the galvanic corrosion process at the beginning of the droplet evaporation (initial height 1.8 mm) and after 24 h of a continuum evaporation process at 25 ᐤC and 85% RH (final size 0.06 mm).

The galvanic interactions between AA2024 and Carbon Fiber Reinforced Polymer under a dynamic drop of NaCl electrolyte were studied. The use of a dynamic electrolyte provided the unique opportunity to investigate both thick and ultra-thin electrolyte systems. A modeling approach was achieved by solving the Nernst-Planck equations in a 2D dynamic domain. Two kinds of boundary conditions were considered: electrochemical and physicochemical. Huge differences were found in the galvanic corrosion process at the beginning of the droplet evaporation (initial height 1.8 mm) and after 24 h of a continuum evaporation process at 25 ᐤC and 85% RH (final size 0.06 mm).

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