African Journal of
Pure and Applied Chemistry

  • Abbreviation: Afr. J. Pure Appl. Chem.
  • Language: English
  • ISSN: 1996-0840
  • DOI: 10.5897/AJPAC
  • Start Year: 2007
  • Published Articles: 357

Full Length Research Paper

Inhibition of mild steel corrosion using Juniperus plants as green inhibitior

Saedah R. Al-Mhyawi
  • Saedah R. Al-Mhyawi
  • Department of Chemistry, Science Faculty for Girls, King Abdulaziz University, P. O.Box 2321, Jeddah 21451, Saudi Arabia.
  • Google Scholar


  •  Published: 17 January 2014

Abstract

The corrosion inhibition of mild steel in H2SO4 solution in the presence of Juniperus  plant at a temperature range of 30 to 60°C was studied using chemical (HE and WL) and electrochemical (PDP and EIS) methods. The Juniperus plant acts as an inhibitor in the acid environment. The inhibition efficiency increases with increase in inhibitor concentration but decreases with an increase in temperature. The inhibitive effect of the Juniperus plant could be attributed to the presence of some compound in the plant which is adsorbed on the surface of the mild steel. The Juniperus plant was found to conform to the Frumkin adsorption isotherm and Temkin adsorption isotherm at all the concentration levels and temperature studied. The phenomenon of physical adsorption is proposed from the activation parameters obtained. Thermodynamic parameters revealed that the adsorption process is spontaneous.

Key words: Corrosion-inhibition, frumkin adsorption isotherm and temkin adsorption isotherm, physical adsorption, Juniperus plant.