Study of Adsorption Behavior and Inhibition Mechanism of Mild Steel in Hydrochloric Acid by a Novel Thiadiazole Derivative

Abstract

N′-(4-hydroxy-3-methoxybenzylidene)-2-(5-p-tolyl-1,3,4-thiadiazol-2-ylthio) acetohydrazide (HMTH) was studied as a novel corrosion inhibitor for carbon steel in hydrochloric acid solution by potentiodynamic polarization curves, electrochemical impedance spectroscopy (EIS), chronoamperometry (CA), cyclic voltammetry (CV) techniques and Quantum chemical calculation. The surface morphology of carbon steel in HCl solution in the absence and presence of HMTH was investigated by scanning electron microscopy (SEM). The mechanism of adsorption was determined from Fourier transform infrared spectroscopy (FTIR) and the potential of zero charge (E pzc ). HMTH was found to be an effective corrosion inhibitor by forming a stable adsorption layer on carbon steel.

Experimental and Theoretical Studies of the Corrosion Inhibition Performance of Fatty Acid-based Ionic Liquids for Mild Steel in 1 M HCl: Effects of the Varied Alkyl Chain Length in the Anionic Group

“…The FTIR spectra of the five FAILs inhibitors are consistent with the previous literature (Figure S1). For the sample that was immersed in the blank HCl solution, the peaks at 3863 and 3751 cm –1 correspond to the Fe–O bonds, the peaks at 1009 and 680 cm –1 arise from FeOOH and Fe 3 O 4 , − and the appearance of the peaks at 3440 and 1644 cm –1 is ascribed to the O–H stretching and bending vibration, illustrating that the water molecules could adsorb on the corrosion film. ,, Moreover, compared to the spectra of the corrosion film formed in the blank solution, some characteristic peaks of FAILs inhibitor are present in the spectra of the adsorbed film on the sample after immersion with additional FAILs inhibitors. These characteristic bands such as N–H (1576 cm –1 ), C–H (1469, 1379 cm –1 ), and C–O (1290 cm –1 ) are slightly shifted to 1541, 1447, 1366 and 1248 cm –1 , respectively.…”

1-hydroxy Benzotriazole as Corrosion Inhibitor for Mild Steel in 1 mol/L Hydrochloric Acid Solution

“…Using corrosion inhibitors is one of the most efficient and economical method for protection of the metals and their alloys against corrosion, especially in acidic media. 1,2 Usually, heterocyclic organic compounds with S, O or N atoms, as well as O electrons, are proved as the most effective corrosion inhibitors. [3][4][5][6] The reason why corrosion inhibitors can reduce the corrosion rate usually is ascribed to its adsorption to the metal and alloy surface.…”