The role of indole and its derivatives in the pitting corrosion of Al in neutral chloride solution

The ability of indole and its derivatives to protect aluminium against pitting corrosion was studied using potentiodynamic polarization technique. The order of inhibition effect of these compounds was found to be tryptamine (II) > tryptophane (III) > indole (I). The current decay measurements...

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Bibliographic Details
Published in:Corrosion science 2004-03, Vol.46 (3), p.579-590
Main Authors: El-Shafei, A.A, Abd El-Maksoud, S.A, Fouda, A.S
Format: Article
Language:English
Subjects:
Aluminium
Applied sciences
Corrosion
Corrosion environments
Corrosion mechanisms
Ethanol oxidation
Exact sciences and technology
Inhibition
Metals. Metallurgy
Pitting corrosion
Platinum
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Summary:The ability of indole and its derivatives to protect aluminium against pitting corrosion was studied using potentiodynamic polarization technique. The order of inhibition effect of these compounds was found to be tryptamine (II) > tryptophane (III) > indole (I). The current decay measurements were used to confirm the inhibiting characteristics and the order of inhibition effect of these compounds. The inhibition properties of these compounds were discussed according to their adsorption on Al surface. The inhibition efficiency was found to be depending upon the number of active centres, molecular size and the mode of adsorption. The effect of preadsorbed film of these compounds on the pitting corrosion of Al was also studied. Finally, their influence on the ethanol oxidation was tested using cyclic voltammetric technique. The results were discussed and correlated to the their inhibition properties towards Al pitting corrosion.
ISSN:0010-938X
1879-0496
DOI:10.1016/S0010-938X(03)00067-2