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The efficiency of three furan derivatives, namely 2-(p-toluidinylmethyl)-5-methyl furan (Inh. A), 2-(p-toluidinylmethyl)-5-nitro furan (Inh. B) and 2-(p-toluidinylmethyl)-5-bromo furan (Inh. C), as possible corrosion inhibitors for mild steel in 1.0 M HCl, has been determined by weight loss and electrochemical measurements. These compounds inhibit corrosion even at very low concentrations, and 2-(p-toluidinylmethyl)-5-methyl furan (Inh. A) is the best inhibitor. Polarization curves indicate that all compounds are mixed-type inhibitors, affecting both cathodic and anodic corrosion currents. Adsorption of furan derivatives on the mild steel surface follows the Langmuir adsorption isotherm, and the calculated Gibbs free energy values confirm the chemical nature of the adsorption. Monte Carlo simulations technique incorporating molecular mechanics and molecular dynamics can be used to simulate the adsorption of furan derivatives on mild steel surface in 1.0 M HCl.

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Abstract:The inhibition effect of potassium iodate on the corrosion of aluminum in 2M HCl has been studied by weight loss, polarization and electrochemical impedance spectroscopy (EIS) measurements. It has been found that KIO 3 acts as an excellent inhibitor. Inhibition efficiency with 100 ppm inhibitor was very high. Polarization curves reveal that the used inhibitor is a mixed type inhibitor. The surface adsorption of KIO 3 leads to a decrease of double layer capacitance as well as an increase of polarization resistance. The adsorption of the inhibitor on the aluminum surface is in agreement with Temkin adsorption isotherm.

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The polarographic behaviour of a series of arylazothiohydantoin derivatives has been investigated a t a dropping mercury electrode. Two waves were displayed. The first and predominant one is due to the reductive splitting of the azo-linkage by a 4e irreversible process. The second is assumed to be for the reduction of the CONHCO group in the resulting molecule. A mechanism for the electrode process covering a wide range of pH is proposed, discussed, and clarified via model compounds, identification of the resulting products of electrolysis, pK, determinations, and the interpretation of a-€3 plots.

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