Evaluation of protection performances of Stylosanthes gracilis extract against 304L corrosion in H2SO4 solution

Okiemute Dickson Ofuyekpone; Ochuko Goodluck Utu; Basil O. Onyekpe; Adeolu Adesoji Adediran; Makanjuola Oki

Case Studies in Chemical and Environmental Engineering (Sep 2020)

Evaluation of protection performances of Stylosanthes gracilis extract against 304L corrosion in H2SO4 solution

Okiemute Dickson Ofuyekpone,
Ochuko Goodluck Utu,
Basil O. Onyekpe,
Adeolu Adesoji Adediran,
Makanjuola Oki

Affiliations

Okiemute Dickson Ofuyekpone: Department of Metallurgical Engineering, Delta State Polytechnic, Ogwashi-Uku, P.M.B 1030, Delta State, Nigeria; Corresponding author. Department of Metallurgical Engineering, Delta State Polytechnic, Ogwashi-Uku, P.M.B 1030, Delta State, Nigeria.
Ochuko Goodluck Utu: Department of Welding and Fabrication, Delta State Polytechnic, Ogwashi-Uku, P.M.B 1030, Delta State, Nigeria
Basil O. Onyekpe: Department of Mechanical Engineering, University of Benin, P.M.B 1154, Benin City, Edo State, Nigeria
Adeolu Adesoji Adediran: Department of Mechanical Engineering, Landmark University Omu-Aran, P.M.B 1001, Kwara State, Nigeria; Landmark University SDGs-9 (Industry, Innovation and Infrastructure Research Group), Landmark University Omu-Aran, P.M.B 1001, Kwara State, Nigeria; Corresponding author. Department of Mechanical Engineering, Landmark University Omu-Aran, P.M.B 1001, Kwara State, Nigeria.
Makanjuola Oki: Department of Mechanical Engineering, Landmark University Omu-Aran, P.M.B 1001, Kwara State, Nigeria; Landmark University SDGs-9 (Industry, Innovation and Infrastructure Research Group), Landmark University Omu-Aran, P.M.B 1001, Kwara State, Nigeria

Journal volume & issue: Vol. 2
p. 100058

Abstract

Read online

Corrosion protection performance of leaf extracts from Stylosanthes gracilis on 304 L steel in H2SO4 solution was evaluated using weight loss, electrochemical and surface morphological examinations. Results obtained indicate that the extracts displayed good protection against corrosion of 304 L in H2SO4. From thermodynamics and adsorption considerations the extracts acted as a mixed-type inhibitor at an optimum concentration of 1.2 g/l. The adsorption of the extract on 304 L stainless steel surface was found to be endothermic and obeyed the Langmuir adsorption isotherm. The protection performance of the extract was confirmed through scanning electron microscopy examinations which revealed a lower population density and degree of pitting corrosion on the specimen immersed in inhibited sulfuric acid as compared to the uninhibited specimens which were massively decorated with pits of various dimensions.

Published in Case Studies in Chemical and Environmental Engineering

ISSN: 2666-0164 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Engineering (General). Civil engineering (General): Environmental engineering; Technology: Chemical technology: Chemical engineering
Website: https://www.journals.elsevier.com/case-studies-in-chemical-and-environmental-engineering

About the journal

Abstract

Keywords