OICC Press International Journal of Industrial Chemistry 2228-5547 10 1 2023 11 17 Corrosion inhibition and adsorption behavior of phytic acid on Pb and Pb–In alloy surfaces in acidic chloride solution https://doi.org/10.1007/s40090-019-0169-4 EN Hany M. Abd El‑Lateef Department of Chemistry, Faculty of Science, Sohag University, Sohâg 82524, Egypt Abdel‑Rahman El‑Sayed Department of Chemistry, Faculty of Science, Sohag University, Sohâg 82524, Egypt Hossnia S. Mohran Department of Chemistry, Faculty of Science, Sohag University, Sohâg 82524, Egypt Hoda A. El-Shafy Shilkamy Department of Chemistry, Faculty of Science, Sohag University, Sohâg 82524, Egypt Journal Article 2023 11 17 The corrosion and corrosion inhibition of Pb and Pb–In alloys in HCl solution, were investigated. The study was performed in the absence and presence of the phytic acid (PA) inhibitor using potentiodynamic polarization and electrochemical impedance spectroscopy measurements, and complementary by scanning electron microscope (SEM) and X-ray spectroscopy analysis (EDX) investigations. The obtained outcomes showed that the PA is efficient corrosion inhibitor for Pb and Pb–In alloys in HCl solution. The inhibition efficiency (η %) for Pb and its investigated alloys increases with an increase in the concentration of PA and decreases with increasing temperature. The maximum inhibition efficiency (≈ 80%) was obtained at 1 × 10−3 M of the PA inhibitor. Langmuir adsorption isotherm fits well the experimental data. SEM/EDX observations of the electrode surface confirmed the existence of an adsorbed film. One can conclude that the increase in activation energy with increasing additive concentration, in addition to the decrease in η % in the presence of inhibitor with temperature, is suggestive of physical adsorption of the inhibitor molecules on the surface of Pb and Pb–0.5In alloy.