Analytical and Bioanalytical Electrochemistry is an international scientific journal, which is published online every 3 months (since 2009), every 2 months (since 2011) and monthly (since 2018) by Center of Excellence in Electrochemistry, University of Tehran Analytical and Bioanalytical Electrochemistry - 16 1 2024 01 31 Application of Electrochemical Impedance Spectroscopy as An Alternative Method to Evaluate the Efficiency of Cathodic Protection in Simulated Soil Solution 49 59 710594 10.22034/abec.2024.710594 EN Abdelali Abdenbi Laboratory of Science, Technology and Process Engineering, University of Science and Technology of Oran-Mohamed-Boudiaf Oran, 31000 Algeria 0000-0002-0527-6941 Mohammed Hadjel Laboratory of Science, Technology and Process Engineering, University of Science and Technology of Oran-Mohamed-Boudiaf Oran, 31000 Algeria Mohammed Belahouel University of Science and Technology of Oran –Mohamed-Boudiaf Oran, 31000 Algeria Journal Article 2023 06 03 Buried pipeline steels are exposed to external corrosion due to the aggressive effect of the soil environment. Despite the double protection system consisting of a coating and cathodic protection, the risk of failure is present and can lead to a reduction in the structural integrity of the pipes. Considering the complexity and variability of different soils, a poor estimate of protection conditions can result in either overprotection or underprotection. The current investigation was conducted using a variety of cathodic potentials on X52 carbon steel. The samples were covered by a layer of natural clay and soaked with a simulated soil solution. Chronoamperometry measurements and electrochemical impedance spectroscopy (EIS) technique were used. The analysis of the impedance diagrams revealed significant variations in form and characteristics when the steel was exposed to different cathodic potential degrees. It was also noticed that the charge transfer resistance decreased gradually at lower applied cathodic potentials. On the other hand, it was observed that the passive layer protectiveness could be evaluated by the EIS method. In this study, it was clearly shown that the EIS technique can be used as a method to monitor and control the performance of cathodic protection. https://www.abechem.com/article_710594_1c120d37cb04335009cb35601e3a8786.pdf