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

Some hydrazone derivatives as corrosion inhibitors for iron in 3.5% H3PO4 solution

A. S. Fouda1*, M. Abdallah2 and Z. El-Badrawy1
1Chemistry Department, Faculty of Science, El Mansoura University, El-Mansoura -35516, Egypt. 2Chemistry Department, Faculty of Science, Benha University, Egypt.  
Email: [email protected]

  •  Accepted: 26 October 2010
  •  Published: 31 August 2011

Abstract

The inhibition of corrosion of pure iron in 3.5% H3PO4 by some hydrazone derivatives has been investigated by weight loss and galvanostatic polarization techniques. The inhibition efficiency was increased by increasing inhibitor concentration and decreased by rise in temperature. Polarization studied revealed that these compounds behave as mixed-type inhibitors. The inhibition action of hydrazone derivatives was performed via adsorption of these compounds on iron surface following Frumkin adsorption isotherm.  The corrosion behavior of iron in 3.5% H3PO4 solution in the presence of hydrazone-halide mixtures was studied. Some thermodynamic parameters were calculated and discussed. The correlation between the inhibition efficiency and quantum chemical parameters wasinvestigated in order to elucidate the inhibition mechanism of the investigated compounds.

 

Key words: Corrosion, iron, H3PO4, hydrazone derivatives, quantum chemical calculations.