Ebrahim M.R.Shehata O.S.Abdel Fatah A.H.Solid State DepartmentPhysics DivisionNational Research CentreDokkiP.O. 12622GizaEgypt; Physical Chemistry DepartmentNational Research CentreDokkiP.O. 12622GizaEgypt; Faculty of BiotechnologyModern Science and Arts UniversityOctober CityGiza 6Egypt2020-01-092020-01-09201915671739https://doi.org/10.1016/j.cap.2019.01.005PubMedIDhttps://t.ly/8ppE3ScopusThe behavior of Al 2 O 3 /Al 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 2MKOH were done at room temperature. Results show hydroxyl ions accumulate on the surface due to Al deformation micro cavities filling with Al 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 Al 2 O 3 to stable tetrahedral Al(OH) 4 ? aluminate ions. Therefore future benefits could be reached by developing such surfaces having charge accumulation that enables environmental interaction. � 2019 Korean Physical SocietyEnglishOctober University for Modern Sciences and Artsجامعة أكتوبر للعلوم الحديثة والآدابUniversity of Modern Sciences and ArtsMSA UniversityCyclic voltammetryElectrochemical impedance spectroscopySurface compositesSurface mechanical alloyingAluminaAluminum coatingsAluminum oxideCyclic voltammetryElectrochemical impedance spectroscopyIonsMechanical alloyingMicrocavitiesSodium AluminateSpectroscopyAlkaline mediaAluminate ionsCharge accumulationElectrochemical behaviorsEnvironmental interactionsExposure-timeFuture benefitsSurface compositesElectrochemical electrodesArticlehttps://doi.org/10.1016/j.cap.2019.01.005PubMedID