Pumpkin Leaf Extract Crop Waste as a New Degradable and Environmentally Friendly Corrosion Inhibitor

Abstract

The pumpkin leaf was extracted by the decoction method, and it was used as an eco-friendly, nontoxic inhibitor of copper in 0.5 M H 2 SO 4 corrosion media. To evaluate the composition and protective capacity of the pumpkin leaf extract, Fourier infrared spectroscopy, electrochemical testing, XPS, AFM, and SEM were employed. The results showed that the pumpkin leaf extract (PLE) is an effective cathode corrosion inhibitor, exhibiting exceptional protection for copper within a specific temperature range. The corrosion inhibition efficiency of the PLE against copper reached 89.98% when the concentration of the PLE reached 800 mg/L. Furthermore, when the temperature and soaking time increased, the corrosion protection efficiency of 800 mg/L PLE on copper consistently remained above 85%. Analysis of the morphology also indicated that the PLE possesses equally effective protection for copper at different temperatures. Furthermore, XPS analysis reveals that the PLE molecules are indeed adsorbed to form an adsorption film, which is consistent with Langmuir monolayer adsorption. Molecular dynamics simulations and quantum chemical calculations were conducted on the main components of the PLE.

Amphiphilic Janus Graphene Oxide Acts as a Corrosion Inhibitor to Mitigate the Corrosion Caused by a 1 M HCl Solution on Mild Steel

“…Four adsorption isotherms (Langmuir, Temkin, Freundlich, and Flory–Huggins) are used to fit the results of the weight loss experiment to further study the adsorption behaviors of GO and JGO (Figure and Figures S3–S5). The Langmuir adsorption isotherm with the highest correlation coefficient (Table S2) is the most suitable model in this study, which is expressed as C i θ = 1 K a d s + C i where θ, C i , and K ads represent the surface coverage (the value is equivalent to the corrosion inhibition efficiency), the concentration of GO or JGO, and the adsorption equilibrium constant, respectively …”

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Experimental and Theoretical Studies on Long Alkyl Chain-Bearing Dibenzotriazole Ionic Liquids as Eco-friendly Corrosion Inhibitors in Aqueous Hydrochloride Acid

“…Application of traditional corrosion inhibitors, like chromate, is now limited due to their toxicity. Recently, a significant amount of green corrosion inhibitors have been developed, including biobased chemicals, , synthetic organic compounds, − carbon materials, − and ionic liquids (ILs). − …”