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Factors affecting the corrosion behaviour of aluminium in acid solutions. II. Inorganic additives as corrosion inhibitors for Al in HCl solutions
Faculty
Science
Year:
2013
Type of Publication:
Article
Pages:
14-24
Authors:
Abd El Haleem, S. M, Abd El Wanees, S, Abd El Aal, E. E, Farouk, A
DOI:
10.1016/j.corsci.2012.09.038
Journal:
CORROSION SCIENCE PERGAMON-ELSEVIER SCIENCE LTD
Volume:
68
Research Area:
Materials Science; Metallurgy \& Metallurgical Engineering
ISSN
ISI:000315013300002
Keywords :
Aluminium, Weight loss, Oxide film repair, Oxide film destruction, Corrosion inhibition
Abstract:
CrO42-, WO42- and HPO42- ions affect on the corrosion behaviour of Al in 2 M HCl. The inhibition efficiencies of the additives depend on their type and increase with increasing concentration. Oxide filth destruction and/or repair follow a direct logarithmic law. The inhibitive action of these anions is discussed in terms of competitive adsorption with Cl- ions on the electrode surface followed by a reduction mechanism to form metal oxides. The calculated values of Delta G degrees(ads) of the inhibition process reveal a physical adsorption of the inhibitors. The inhibition efficiency is found to decrease in the order: CrO42- > WO42- > HPO42-. (C) 2012 Elsevier Ltd. All rights reserved.
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