The Adsorption Behavior of Poly(acrylamide) / Poly(N-vinylpyrrolidone) Blends as Green Corrosion Inhibitors for Mg-Al Alloy: Experimental and DFT Studies

Helal, Nadia H.; Abd El-Hafeez, Ghada M.; Mohammed, Hassnaa H.; Moustapha, Moustapha Eid; Farag, Zeinab Ramadan

doi:10.21608/ifjsis.2023.206285.1011

The Adsorption Behavior of Poly(acrylamide) / Poly(N-vinylpyrrolidone) Blends as Green Corrosion Inhibitors for Mg-Al Alloy: Experimental and DFT Studies

Document Type : Original full papers (regular papers)

Authors

¹ Faculty of Science, Chemistry Department, Fayoum University, 63514 Fayoum, Egypt

² Department of Chemistry, College of Science and Humanities in Al-Kharj, Prince Sattam bin Abdulaziz University, 11942 Al-Kharj, Saudi Arabia

10.21608/ifjsis.2023.206285.1011

Abstract

Eco-friendly organic compounds have attracted attention to be examined as corrosion inhibitors to control metallic corrosion process of pure metals and metal alloys in different media. Polymers are one of the well-known materials, which are used to inhibit metallic corrosion. The inhibition effect poly(N-vinylpyrrolidone) (PVP), poly(acrylamide) (PAM) and their blends on the corrosion behavior of magnesium alloy (Mg-10Al) in an aqueous acidic sulphate aerated unstirred solutions. Electrochemical impedance spectroscopic (EIS), potentiodynamic polarization and quantum calculations methods were used to investigate the corrosion behavior over a range of temperatures and concentrations. The data obtained from the potentiodynamic polarization method indicated that used polymeric additives behave as a mixed-type inhibitor. The results showed that the dominant process in controlling the corrosion of the tested alloy was a charge transfer process. The corrosion inhibition efficiency was found to be 81.6% and 83% for PAM and PVP, respectively. The results showed that the adsorption of PVP and PAM on the alloy surface was found to comply with the Langmuir adsorption isotherm. A proposed mechanism was suggested to explain the inhibition action of the used polymers. Also the surface morphology was examined using atomic force microscopy AFM.

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