The article discusses a novel approach to measuring the rate of corrosion of painted metals underneath protective coatings. Traditional methods like potentiodynamic polarization face challenges in accurately quantifying the degradation rate due to ion impermeability of organic coatings. The newly introduced technique, hydrogen permeation-based potentiometry (HPP) combined with electrochemical impedance spectroscopy (EIS), overcomes this limitation. By utilizing atomic hydrogen to polarize the coated metal interface without the need for ion transport, the HPP method effectively measures the ORR rate underneath coatings. The research, led by Vijayshankar Dandapani and Rasmi Ranjan Tripathy from the Indian Institute of Technology (IIT) Bombay, demonstrated the effectiveness of this approach in quantifying metal degradation. The study involved generating hydrogen on one side of a double electrochemical cell using a palladium membrane, which permeated through to the other side and reacted with oxygen, leading to a decrease in electrochemical potential. This method accurately measured the kinetics of ORR underneath a polymer coating, providing insights into the true degradation rate. Furthermore, the researchers incorporated electrochemical impedance spectroscopy (EIS) to measure charge transfer resistance and coating pore resistance, confirming the effectiveness of the HPP approach in quantifying coating degradation. The combined HPP-EIS technique proved successful in determining the degradation rate of a polymer coating on an industrial metal layer, showcasing its potential in industries dealing with metal degradation. The article emphasizes the practical applications of this innovative technique, not only in corrosion studies but also in fields like sensor technology, fuel cells, and fundamental research relying on electrochemical phenomena. The findings have broader implications for industries concerned with coating protection and metal durability, offering a reliable method to assess degradation rates and enhance protective measures.