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Electrochemical behavior of Al2O3/Al composite coated Al electrodes through surface mechanical alloying in alkaline media

Authors:	MR Ebrahim OS Shehata Amr H Abdel Fatah

Institution:	1. Solid State Department, Physics Division, National Research Centre, Dokki, Giza, P.O. 12622, Egypt;2. Physical Chemistry Department, National Research Centre, Dokki, Giza, P.O. 12622, Egypt;3. Faculty of Biotechnology, Modern Science and Arts University, 6 October City, Giza, Egypt

Abstract:	The behavior of $A l_{2} O_{3} / A l$ composite coated Al electrodes fabricated by surface mechanical alloying ‘SMA’ was studied. The work was accomplished using Cyclic voltammetry and electrochemical impedance spectroscopy (EIS) techniques in alkaline media $2 M K O H$ were done at room temperature. Results show hydroxyl ions accumulate on the surface due to Al deformation micro cavities filling with $A l_{2} O_{3}$ until full charge blockage reached. A barrier cover layer development causing an increase of both resistance and capacitance as it becomes more stable and thinner with exposure time increase. Migrating hydroxyl ion inside micro cavity changed its composition from Al₂O₃ to stable tetrahedral $A l {(O H)}_{4}^{?}$ aluminate ions. Therefore future benefits could be reached by developing such surfaces having charge accumulation that enables environmental interaction.

Keywords:	Corresponding author Surface mechanical alloying Surface composites Cyclic voltammetry Electrochemical impedance spectroscopy
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