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Journal of Applied Sciences and Environmental Management
World Bank assisted National Agricultural Research Project (NARP) - University of Port Harcourt
ISSN: 1119-8362
Vol. 22, No. 8, 2018, pp. 1337-1341
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Bioline Code: ja18224
Full paper language: English
Document type: Research Article
Document available free of charge
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Journal of Applied Sciences and Environmental Management, Vol. 22, No. 8, 2018, pp. 1337-1341
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Mild Steel Deterioration Inhibition in 1.0M and 5.0M Tetraoxosulphate (VI) Acid using Leaf Extract of Pterocarpus santaliniodes 
OFOMA, EO; EKEMEZIE, P N & EMERUWA, C N
Abstract
The prevention of deterioration of mild steel in 1.0M and 5.0M H2SO4 solution by leaf extracts of
Pterocarpus santaliniodes was investigated in this study using gravimetric and gasometric methods. Data obtained from
the study revealed that leaf extracts had a maximum inhibition efficiency of 88.70% and 96% for weight loss and gasometric
analysis, respectively for 1.0M H2SO4, and an inhibition efficiency of 71.76% and 79.66% for weight loss and gasometric
analysis respectively for 5.0M H2SO4. It was observed that the gasometric method gave the optimum protection. The
average activation energy was 73.71KJ/mol in 1.0M H2SO4, and 74.41KJ/mol in 5.0M H2SO4. The adsorption of the
phytochemicals on the surface of the mild steel were further assessed by the Langmuir and Freundlich isotherms. The
extract was found to be good inhibitor for mild steel corrosion in the H2SO4 solutions. The amount of material loss decreased
in the in the presence of the extract when compared to the blank acid solution.
Keywords
Mild steel; Corrosion inhibition; H2SO4; Pterocarpus santaliniodes.
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© Copyright 2018 - Ofoma et al.
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