In this study, the electrochemical and semiconducting behaviour of a brass alloy in borax solutions under open circuit potential (OCP) was investigated. The OCP plots showed that the open circuit potential values in all solutions shifts towards positive amounts, which is an indicative of formation of the passive films. The potentiodynamic polarization curves revealed that the corrosion current densities decrease with decrease in concentration of borax solutions. The Mott–Schottky analysis indicated that the passive films displayed p-type semiconductive characteristics, where the metal vacancies preponderated. Also, the Mott–Schottky analysis revealed that with the decrease of solution concentration, the acceptor density of the passive films decreased. Finally, the electrochemical impedance spectroscopy (EIS) data showed that the decrease in solution concentration increases the impedance value.
