INHIBITORY EFFECT AND ADSORPTION CHARACTERISTICS OF 2,3-DIAMINONAPHTHALENE AT ALUMINUM/HYDROCHLORIC ACID INTERFACE: EXPERIMENTAL AND THEORETICAL STUDY

I. B. Obot () and N. O. Obi-Egbedi
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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

Surface Review and Letters (SRL), 2008, vol. 15, issue 06, 903-910

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.

Keywords: 2; 3-diaminonaphthalene; aluminum; corrosion inhibition; adsorption isotherm; quantum chemical studies; Austin Model 1 (AM1) (search for similar items in EconPapers)
Date: 2008
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DOI: 10.1142/S0218625X08012074

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