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INHIBITION OF CORROSION OF MILD STEEL BY AN ALCOHOLIC EXTRACT OF A SEAWEED SARGASSUM MUTICUM
(Zastita Materijala, 2021) Victor David Arockiaraj, Mallika Jeslina; Suyambulingam, Jone Kirubavathy; Abdulhameed, Al-Hashem; Susai, Santhammal Rajendran; Joany, RM; Caslav, Lacnjevac
An alcoholic extract of a sea weed Sargassum muticum has been used to control corrosion of mild steel in 0.5 N HCl. Weight loss method and Electrochemical studies have been used in this study. Weight loss study reveals that 500 ppm of the inhibitor offers 99.25 % inhibition efficiency. Polarization study reveals that the inhibitor functions as an anodic inhibitor at higher concentration. The AC impedance spectra confirm the formation of a protective film on the metal surface. Adsorption of inhibitor molecules on the metal surface follows Langmuir adsorption isotherm
INHIBITION OF CORROSION OF MILD STEEL BY AN ALCOHOLIC EXTRACT OF A SEAWEED SARGASSUM MUTICUM
(Engineering Society for Corrosion, 2021-09-25) Victor David Arockiaraj, Mallika Jeslina; Suyambulingam, Jone Kirubavathy; Abdulhameed, Al-Hashem; Susai, Santhammal Rajendran; Joany, RM; Caslav, Lacnjevac
An alcoholic extract of a sea weed Sargassum muticum has been used to control corrosion of mild steel in 0.5 N HCl. Weight loss method and Electrochemical studies have been used in this study. Weight loss study reveals that 500 ppm of the inhibitor offers 99.25 % inhibition efficiency. Polarization study reveals that the inhibitor functions as an anodic inhibitor at higher concentration. The AC impedance spectra confirm the formation of a protective film on the metal surface. Adsorption of inhibitor molecules on the metal surface follows Langmuir adsorption isotherm.
MILD STEEL CORROSION INHIBITION IN 1 M HCL BY AN ALCOHOLIC EXTRACT OF SARGASSUM MUTICUM
(Portugaliae Electrochimica Acta, 2023) Jeslina, V; Jone Kirubavathy, S; Abdulhameed, Al-Hashem; Rajendran, S; Joany, R M; Caslav, Lacnjevac
The inhibitive effect of a seaweed (SM) alcoholic extract on MS corrosion immersed in 1 M HCl, for 30 min, was evaluated by the WL method and PPD technique. The protective film was investigated by the Vickers hardness test. WL revealed that 500 ppm SM offered 84 % IE against MS corrosion in 1 M HCl. The inhibitor molecules adsorption onto the metal surface obeyed Langmuir’s adsorption isotherm. The R2 value was very high (0.998). The PPD study showed that Ecorr slightly shifted to the anodic side. It was inferred that SM functions as a mixed type of corrosion inhibitor, since the shifts were relatively small. In SM presence, LPR value increased and Icorr decreased. Due to the blanket effect (formation of a protective film on the metallic surface, which was found to be a monolayer, blocking anodic and cathodic sites), the electrons transfer from the metal into the solution was blocked. Vickers hardness of the inhibited MS surface was lower than that of the polished one, but higher than that of the corroded one. The outcome of the study may be used in the pickling industry, where HCl is used to remove the rust from the metal surface, simultaneously not attacking it.