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

Inhibitive action of hexadecyltrimethylammonium bromide (HDTAB) on aluminium alloy (AA3003) corrosion in hydrochloric acid medium

P. M. Niamien*, D. Ossonon, A. Trokourey, H. A. Kouassi and Y. Bokra
Physical Chemistry Laboratory-UFR SSMT, University of Cocody-Abidjan.
Email: [email protected]

  •  Accepted: 13 July 2011
  •  Published: 09 September 2011

Abstract

The inhibitive effect of hexadecyltrimethylammonium bromide (HDTAB) on the corrosion of aluminium alloy (AA3003) in 1 M hydrochloric acid medium was studied by weight loss method in relation to the temperature (25 to 55°C) and inhibitor concentration range 5.10-4 to 10-2 M. This study showed that the inhibitor adsorbs on aluminium alloy (AA 3003) according to the modified Langmuir adsorption isotherm; the inhibitor efficiency decreases with increasing temperature. Adsorption free energies (ΔG°ads) and apparent activation energies (Ea) were determined. The Adsorption free energies reveal that the adsorption process is spontaneous. Furthermore, some adsorption thermodynamic parameters (ΔH°ads, ΔS°ads, Qads) were estimated. Phenomenon of physical adsorption was proposed from the thermodynamic functions of adsorption and activation parameters obtained.

 

Key words: Corrosion, inhibitor, adsorption, desorption, free adsorption energy, activation energy.