Characterization of corrosion products formed on carbon steel in hydrochloric acid medium by 4-(dimethylamino)-1-(6-methoxy- 6-oxohexyl)pyridinium bromide

Abstract

The inhibition of corrosion of carbon steel in 1 M HCl by the synthesized ionic liquid 4-(dimethylamino)-1-(6-methoxy-6-oxohexyl)pyridinium bromide (DMOPB) is performed by electrochemical, gravimetric techniques and surface analysis techniques. The efficiency of inhibition increases with the inhibitor concentration and reached 93% at 10 -3 M. The polarization data indicate that the tested inhibitor is a mixed type. The adsorption of the inhibitor on the surface of the steel in 1 M HCl follows the adsorption isotherm Langmuir. The study of the effect of temperature (303-333 K) on the behavior of the steel in 1 M HCl in the absence and presence of 10 -3 M of the inhibitor shows that the inhibitory efficiencies increase with temperature in this studied range. The corresponding activation parameters in the absence and presence of inhibitor were determined and discussed. The inhibition efficiency was closely related to orbital energies (EHOMO and ELUMO). The correlation between quantum parameters and experimental inhibition efficiency has been validated. Scanning electron microscopy images revealed that the inhibitor formed protective film on mild steel surface.

Organic Compounds as Corrosion Inhibitors for Carbon Steel in HCl Solution: A Comprehensive Review

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Corrosion inhibition of mild steel by Fennel seeds (Foeniculum vulgare Mill) essential oil in 1 M hydrochloric acid solution

“…One of the techniques for minimizing corrosion is the use of inhibitors [3][4][5]. Most of the corrosion inhibitors are organic compounds having heteroatoms in their aromatic ring (N, S, O, P) or long-chain carbon [6][7][8][9][10][11][12][13][14][15][16][17][18][19].…”