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Aniline and some of its derivatives as corrosion inhibitors for nickel in 1M HCl solution
Faculty
Science
Year:
1999
Type of Publication:
Article
Pages:
1061-1068
Authors:
DIAB, A, Abd El Haleem, SM, Abd El Aal, EE, Zakria, W
DOI:
10.1002/(SICI)1097-4660(199911)74:11<1061::AID-JCTB150>3.0.CO;2-M
Journal:
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY JOHN WILEY \& SONS LTD
Volume:
74
Research Area:
Biotechnology \& Applied Microbiology; Chemistry; Engineering
ISSN
ISI:000083782800007
Keywords :
adsorption, polarization, weight loss, nickel, corrosion inhibition, acidic chloride
Abstract:
The inhibiting action of aniline and some of its derivatives (o-, m- and p-anisidine) towards the corrosion behaviour of nickel in 1M HCl solution has been studied using weight loss and polarization techniques. These compounds were found to retard the corrosion rate of nickel. At constant temperature, the corrosion rate decreases with increasing inhibitor concentration. On the other hand, at any inhibitor concentration, the increase in temperature leads to an increase in the corrosion rate. The activation energy, Delta E-a,, the equilibrium constant, k, as well as the other thermodynamic parameters (Delta G(ads)(o), Delta H-ads(o) and Delta S-ads(o)) for inhibitor process were calculated and analysed. The inhibitor efficiencies calculated from both weight loss and polarization methods are in good agreement and were found to be in the order: p-anisidine > o-anisidine > m-anisidine > aniline. The inhibitive action of these compounds was attributed to the adsorption of molecular species and their inhibitive efficiencies depend on the relative position of the -OCH3 group in the aniline ring. (C) 1999 Society of Chemical Industry.
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