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Inhibitory Effect And Adsorption Characteristics Of 2,3-Diaminonaphthalene At Aluminum/Hydrochloric Acid Interface: Experimental And Theoretical Study

Author

Listed:
  • I. B. OBOT

    (Department of Chemistry, Faculty of Science, University of Uyo, Uyo, Nigeria)

  • N. O. OBI-EGBEDI

    (Department of Chemistry, University of Ibadan, Ibadan, Nigeria)

Abstract

The inhibitive effect of 2,3-diaminonaphthalene (2,3-DAN) for corrosion of aluminum in 1 MHClwas investigated using hydrogen evolution technique at 30 and 40°C. Quantum chemical calculation results showed that 2,3-DAN molecule possessed planar structure with a number of active centers, which aided the adsorption process. The Mulliken charge density, the highest occupied molecular orbital (HOMO), and the lowest unoccupied molecular orbital (LUMO) were found mainly focused around nitrogen atoms and the cyclic of the benzene as well. The presence of 2,3-DAN molecules in the corrosive medium (1 MHClsolution) inhibits the corrosion process of aluminum and as the concentration of 2,3-DAN increases the inhibition efficiency also increases but decreases with rise in temperature. The corrosion inhibition of 2,3-DAN was discussed in terms of blocking of theAlsurface by adsorption of the molecules of the inhibitor at the active centers. It was found that the adsorption of 2,3-DAN onto theAlsurface followed the Langmuir adsorption isotherm and 2,3-DAN adsorbed onAlsurface probably by physisorption. The proposed physisorption mechanism was supported by the calculated values ofEa,Qads, andΔGads.

Suggested Citation

  • I. B. Obot & N. O. Obi-Egbedi, 2008. "Inhibitory Effect And Adsorption Characteristics Of 2,3-Diaminonaphthalene At Aluminum/Hydrochloric Acid Interface: Experimental And Theoretical Study," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 15(06), pages 903-910.
    • Handle: RePEc:wsi:srlxxx:v:15:y:2008:i:06:n:s0218625x08012074
    DOI: 10.1142/S0218625X08012074
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