Electrochemical Evaluation of Corrosion Inhibiting Layers Formed in a Defect from Lithium-Leaching Organic Coatings

Peter Visser, Mats Meeusen, Yaiza Gonzalez-Garcia, Herman Terryn, Johannes M. C. Mol
2017 Journal of the Electrochemical Society  
14 This work presents the electrochemical evaluation of protective layers generated in a 15 coating defect from lithium-leaching organic coatings on AA2024-T3 aluminum 16 alloys as a function of neutral salt spray exposure time. Electrochemical impedance 17 spectroscopy was used to study the electrochemical properties on a macroscopic 18 scale. An electrochemical model allowed to quantitatively link the electrochemical 19 behavior with the physical model of the layer in the damaged area as
more » ... amaged area as studied by 20 scanning electron microscopy. Local potentiodynamic polarization curves obtained 21 from micro-cell measurements showed an increase of the passive range in the defect 22 area due to the formation of a robust protective layer. Scanning vibrating electrode 23 technique measurements confirmed the non-reversible long-term corrosion protection 24 of these generated layers in the coating defect. 25 26
doi:10.1149/2.1411707jes fatcat:owfu5olntnbhpoc4d7mh4lrjqi