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Rami K. Suleiman 한국부식방식학회 2019 Corrosion Science and Technology Vol.18 No.5
The sol-gel methodology has been applied successfully in the synthesis of a novel hybrid coating basedon dimethoxymethyl-n-octadecylsilane precursor. The newly synthesized parent coating was functionalizedfurther with two commercially-available corrosion-inhibitive pigments Moly-white® 101-ED and HfucophosZapp®, applied to mild steel panels, and immersed continuously in 3.5% NaCl electrolytic solution for288 h. The corrosion protection performance of the prepared functional coatings was evaluated usingelectrochemical impedance spectroscopy (EIS) and DC polarization techniques. An enhancement in the barrierproperties has been revealed from the electrochemical characterization data of the hybrid films, in comparisonwith untreated mild steel substrates following long-term immersion in 3.5% NaCl. The corrosion resistanceproperties of the newly developed coatings over mild steel substrates found to be largely dependent onthe type of the loaded inhibitive pigment in which the Moly-white inhibitor has a positive impact on thecorrosion protection performance of the parent coating, while an opposite behavior was observed upon mixingthe base polymeric matrix with the commercially-available Zapp corrosion inhibitor.
( H. Hachelef ),( R. Mehdaoui ),( K. Hachama ),( M. Amara ),( A. Khelifa ),( A. Benmoussat ),( M. Hadj Meliani ),( Rami K. Suleiman ) 한국부식방식학회 2023 Corrosion Science and Technology Vol.22 No.5
The aim of the present study was to investigate the effect of thymus extract on corrosion inhibition of aluminum 5083 alloy in a 0.1 M NaCl medium prepared using a mixture of ethylene glycol and water using potentiodynamic and electrochemical impedance spectroscopy (EIS) techniques. The potentiodynamic electrochemical technique showed an increase in corrosion inhibition efficiency starting from 49.63% at a concentration of 0.25 g/L to 92.71% at a maximum concentration of 1.25 g/L of the extract. These results were consistent with those obtained via EIS analysis. Spectral characterization of the tested plant extract using the Fourier-transform infrared spectroscopy (FTIR) technique confirmed the presence of organic compounds having different oxygen and aromatic functionalities in the extract that could help enhance the adsorption of these compounds on the aluminum surface. This study reveals possible adsorption isotherm of the thymus extract on the aluminum surface, supporting a Langmuir isotherm for the adsorption of inhibitor molecules on this surface.
Saviour A. Umoren,Moses M. Solomon,Ime B. Obot,Rami K. Suleiman 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.76 No.-
Plant biomaterials as inexpensive, nontoxic, biodegradable materials are found abundantly in nature. They contain heteroatoms and/or pi electrons that make them candidate for metals corrosion inhibitor. Inrecent years, numerous research works have been undertaken on plant biomaterials as metals corrosioninhibitor in different corrosive media. This review critically looks at the researches done in the years2013–2018. Corrosive environments covered include acidic, basic, neutral, aqueous, geothermalfluid andartificial saliva. The majorfindings and the mechanism of inhibition has been elucidated. The missing gapin this area of research has been pointed out and future direction proposed.