• Brouzi, K.
• Khaoulaf, R.
• Ouannou, A.
• Omar, B.
• Harmouchi, H. El
• Alami, S.
• Moumouche, Oumaima
• Ouakki, M.
• Harcharras, M.

Abstract

This work deals a new corrosion inhibitor, AMnPO4 (A=Na and Li) Monophosphates has been synthesized and characterized. Its corrosion inhibiting action on mild steel in 1M hydrochloric acid solution has studied. Various electrochemical techniques like potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS), alongside surface methods such as scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), Raman spectroscopy, infrared spectrometry, and X-ray diffraction, were employed. The experimental findings indicate that AMnPO4 (A=Na and Li) demonstrates significant inhibitory properties against mild steel corrosion in 1M HCl, with a maximum inhibition efficiency of up to 91.6% for LiMnPO4 at an optimal concentration of 10-3 M. The inhibiting mechanism appears to be of a mixed-type. Furthermore, the adsorption behavior of the compound follows the Langmuir adsorption isotherm. Analysis of the mild steel morphology used by SEM and EDX reveals the formation of a protective layer, enhancing the steel’s resistance to corrosion damage.

Topics

• morphology
• surface
• compound
• corrosion
• scanning electron microscopy
• x-ray diffraction
• steel
• electrochemical-induced impedance spectroscopy
• Energy-dispersive X-ray spectroscopy
• Raman spectroscopy
• spectrometry