In Situ Monitoring of the Lateral Water Diffusion in Coated Metals Using Dual Odd Random Phase Eis

In this work, a novel approach based on the application of dual ORP-EIS is proposed to identify the lateral water diffusion in intact coated metals from the area exposed to the electrolyte to the adjacent non-exposed area. As such, the electrochemical response of the exposed area and non-exposed area with a certain distance from the exposed area is collected simultaneously using a dual front-end (analogue potentiostat). Employing this approach, the lateral water diffusion in polyethylene glycol diacrylate (PEGDA) coated steel panels within the initial hours after immersion is monitored and the diffusion coefficient is determined on both exposed and non-exposed area.