Assessment on Gum Arabic and Whitfieldia lateritia Leaf Extract Composite on Corrosion Protection of Carbon Steel Surface in Extreme Environment
2021
Nwanonenyi, Simeon Chukwudozie
Protection impact of biomass extract (BE) from Whitfieldia lateritia leaf, gum arabic (GA) and their blending (BE/GA) at the ratio of 1:4 and 2.5:2.5 on carbon steel surface in 1.0 M HCl solution was assessed using gravimetric, gasometric and electrochemical technique respectively at varying temperatures. Gravimetric and gasometric results confirmed better effectiveness of BE/GA blend compared to individual inhibitors (even at low and maximum concentrations) in regulating the corrosion of carbon steel induced 1.0 M HCl acid. Also, the performance of inhibited systems was found to be dependent on blend ratio, inhibitor concentration and time variations. Computed results of linear regression for adsorption process of inhibitor with highest efficiency was found to obey Langmuir isotherm and polarization curves revealed that inhibitors exhibited combined action of anodic/cathodic inhibition. Also, physisorption was proposed for adsorption mechanism based on temperature and inhibition relation, and interaction between the inhibitor blend was confirmed to be due synergistic effect. This research provides information on corrosion resistance ability of biomass extract, gum arabic and their blend. Thus, its application in surface coating development where carbon steel is used as industrial materials for pipes, rods and bars, tubes, sheets, plates, etc. will be innovative and unprecedented.
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