By: Arvind Kumar Meena
Department of Chemistry, Govt. Girls College, Karauli, Rajasthan, India.
Gravimetric analysis was used to examine the corrosion inhibitory effects of Acacia nilotica extract in 0.5 N H2SO4 on aluminum alloy at different concentrations and at 303 K. At a corrosion inhibitor concentration 0.45% at 303 K, the inhibition efficiency is found to be remarkably high (52.25%). Results show that the extract’s capacity to inhibit was caused by its adsorption onto the metal surface via the Langmuir adsorption process. For characterization of the Al alloy, the Scanning Electron Microscope (SEM) was employed. It was discovered that the extract gets adsorbed spontaneously on the aluminum or Al alloy surface. As the concentration of extract increases, so does the efficiency of inhibition. Thermodynamic and kinetic parameters including entropy, free energy, and enthalpy of adsorption, were ascertained. It was shown to be exothermic, physical, and spontaneous. The phytochemical components of the Acacia nilotica extract were found to have a high protective influence and are probably responsible for forming a barrier of protection on the metal surface. The best-fitting Langmuir adsorption isotherm on the surface of aluminum has been determined to be an inhibitor adsorption. Thermodynamic and kinetic characteristics showed that the inhibitor and metal surface interacted strongly. The fruit extract of Acacia nilotica contains a high level of protection due to the presence of phytochemicals such as terpenoids, alkaloids, glycosides, saponins, tannins, nitrogen, phosphorus, gallic acid, chlorogenic acid, alkylated flavan-3,4-diol (leucoanthocyanidin), and catechin. Because the fruit extract from Acacia nilotica is non-toxic and biodegradable, its use could lower the financial burden of corrosion monitoring while also lessening the environmental risks that follow. It was discovered that in a sulfuric acid solution, Acacia nilotica extract effectively protects aluminum or aluminum alloy from pitting corrosion.
Citation:
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