Phytochemical Analysis and Ethanolic Extraction of Gardenia aqualla Leaves as Corrosion Inhibitor in 1 M H2SO4 Acid

Opara Ivan1, Japari Joseph1, Pigwe Amos Isa1, Tonny Nyong'a Maraga2,3 and Louis Hitler3,4,*

1Department of Chemistry, Modibbo Adama University of Technology, Yola, Nigeria

2Department of Botany, Jomo Kenyatta University of Agriculture and Technology, Nairobi, Kenya

3CAS Key Laboratory for Nanosystem and Hierarchical Fabrication, CAS Centre for Excellence in Nanoscience, National Centre for Nanoscience and Technology, University of Chinese Academy of Sciences, P.R. China

4Department of Pure and Applied Chemistry, University of Calabar, Calabar, Nigeria

*To whom correspondence to be addressed: E-mail: [email protected]; [email protected]

Abstract

The main objective of this study is to investigate the corrosion inhibition properties of Gardenia aqualla leaf extract on mild steel using weight loss method. The corrosion of mild steel was investigated at different concentrations of G. aqualla and also at different temperatures (303, 313 and 323 K). G. aqualla inhibits the corrosion rate of mild steel from 62.4 mm/yr to 6.5mm/yr, 91.6 mm/yr to 16.6 mm/yr and 113.8 mm/yr to 28.4 mm/yr at 303, 313 and 323 K, respectively, which yielded an optimum result in the values of inhibition efficiency from 63.8 to 89.5 %, 52.5 to 81.9 % and 39 to 75 % for the various temperatures after an interval of 3 days after being in contact with its respective environment. The Langmuir isotherm confirmed that physisorption occurred. It was found that inhibition occurred through adsorption of constituents present in the leaf of G. aqualla obtained by the phytochemical screening

Keywords

Adsorption, Phytochemical screening, Mild steel, Corrosion inhibition, Gardenia aqualla.

  
 
  • Asian J. Mat. Chem. /
  •  2018 /
  •  3(3) /
  •  pp 57-60
  • DOI:10.14233/ajmc.2018.AJMC-P66