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

Case Studies in Chemical and Environmental Engineering

Ochuko Goodluck Utu¹  Makanjuola Oki²  Adeolu Adesoji Adediran³  Okiemute Dickson Ofuyekpone⁴  Basil O. Onyekpe⁵ 

[1]Corresponding author. Department of Metallurgical Engineering, Delta State Polytechnic, Ogwashi-Uku, P.M.B 1030, Delta State, Nigeria.

[2]Department of Mechanical Engineering, Landmark University Omu-Aran, P.M.B 1001, Kwara State, Nigeria

[3]Department of Mechanical Engineering, University of Benin, P.M.B 1154, Benin City, Edo State, Nigeria

[4]Department of Metallurgical Engineering, Delta State Polytechnic, Ogwashi-Uku, P.M.B 1030, Delta State, Nigeria

[5]Department of Welding and Fabrication, Delta State Polytechnic, Ogwashi-Uku, P.M.B 1030, Delta State, Nigeria

关键词: Stylosanthes gracilis;    Mixed-type inhibitor;    Half-life;    Austenitic stainless steel;    Physisorption and chemisorption;   

DOI  :  

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown