ISSN print edition: 0366-6352
ISSN electronic edition: 1336-9075
Registr. No.: MK SR 9/7
Inhibition of aluminium reaction in aqueous
sodium hydroxide solution
M. Miadoková and J. Petrtýlová
Department of Physical Chemistry, Faculty of Natural Sciences,
Komenský University, CS-842 15 Bratislava
Abstract: Phenol and its derivatives inhibit the dissolution of aluminium in aqueous
NaOH solution with increased efficiency in the sequence: phenol, p-nitrophenol, p-aminophenol.
The postulated mechanism of inhibition is based on the donor-acceptor
properties of the system metal—organic substance, on the arrangement of the
electrons in the molecule under the action of prevailing mesomeric effects of
function groups on the aromatic rings.
The expressive increase of inhibition efficiency of p-aminophenol in the
presence of added Ca2+ ions is explained by preferred adsorption of these ions
on the metal surface, consecutive shielding of its negative charge and thereby
the facilitation of binding the organic molecule on the surface. Another
explanation takes into consideration the possibility of creation of Ca2+ complexes with protective properties.
Full paper in Portable Document Format: 392a237.pdf
Chemical Papers 39 (2) 237–244 (1985)