Medium effect on electrochemical behaviour of anodized aluminium

Mazhar, A. A.; Heakal, F. Ei-Taib; Awad, Kh. M.

doi:10.1007/bf01184960

Cited by 4 publications

(1 citation statement)

References 22 publications

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“…After 150 s, the potential remains constant at a value of approximately 13 V/Ag/AgCl (3 M), which can be related with the formation of a porous Al 2 O 3 layer on AA2024 [26,27] partially hydrated given by the contribution of an hydroxide. The pore diameter, density and thickness of the oxide layer formed depend on the oxalic acid concentration, the temperature, and the oxidation current [28].…”

Section: Oxide Layer On Aa2024mentioning

confidence: 99%

Organosilanes and polypyrrole as anticorrosive treatment of aluminium 2024

et al. 2009

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This paper addresses the preparation and characterisation of anticorrosive silane-and polypyrrole-based organic coatings and combinations of the two on aluminium 2024. Layer adsorption studies of organosilanes such as propyl (C3), octyl (C8) and octadecyl (C18) trimethoxysilane and polypyrrole deposits on the aluminium electrodes reveal only limited protection. Their anticorrosive power declines when they are subject to highly corrosive environments, such as salt fog cabinets, for extended periods. The combination of both deposits yields a more protective structure that affords better protection with time. The best performance is achieved with polypyrrole deposits on silanes due to the excellent bonding between the silane adsorbed on the surface of the material and the polypyrrole film. Of the three organosilanes used, the one with the shortest chain performs best. When long-chain organosilanes are used, the polypyrrole film becomes detached due to the lesser interaction between the layers. Electrochemical impedance spectroscopy and morphological studies of the layers also show the greater adhesion and lesser deterioration of polypyrrole deposits on silane layers.

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Section: Oxide Layer On Aa2024mentioning

confidence: 99%