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Evaluation on Physico-Chemical and Corrosion Properties of Anodized Aluminium Surface Using Sodium Oxalate–Sodium Silicate Bath at Room Temperature


Affiliations
1 Department of Chemistry, Chikkaiah Naicker College, Erode 638 004, India
 

This study offers a comprehensive characterization of anodic surface layers formed in sodium oxalate electrolyte and systematically analyses the influence of addition of sodium silicate. X-ray diffraction, scanning electron microscope–EDAX and atomic force microscope studies are used to establish the correlation between electrolyte composition and anodized aluminium (Al). Stable anodic Al layers comprising tailored porosity and surface characteristics are achieved under optimized conditions, which exhibit corrosion current density (Icorr: 1.04 × 10–5 μA cm–2) with high corrosion resistance of 7.03 × 102 Ω cm–2. Effect of anodization variables upon surface morphology, kinetic parameters, microstructural characteristics and thickness of anodized Al is evaluated. Gradient distribution of Si and O also indicates the relative content of silicate as illustrated by EDAX. Interpreted results from electrochemical impedance spectra and Tafel analysis are well-matched with physico-chemical analysis. Stable anodic Al layers comprising tailored morphology with high corrosion resistance are achieved under optimized conditions.

Keywords

Aluminium, Anodization, Corrosion Resistance, Sodium Oxalate, Sodium Silicate.
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  • Evaluation on Physico-Chemical and Corrosion Properties of Anodized Aluminium Surface Using Sodium Oxalate–Sodium Silicate Bath at Room Temperature

Abstract Views: 497  |  PDF Views: 136

Authors

M. Mubarak Ali
Department of Chemistry, Chikkaiah Naicker College, Erode 638 004, India
S. Sathiya
Department of Chemistry, Chikkaiah Naicker College, Erode 638 004, India

Abstract


This study offers a comprehensive characterization of anodic surface layers formed in sodium oxalate electrolyte and systematically analyses the influence of addition of sodium silicate. X-ray diffraction, scanning electron microscope–EDAX and atomic force microscope studies are used to establish the correlation between electrolyte composition and anodized aluminium (Al). Stable anodic Al layers comprising tailored porosity and surface characteristics are achieved under optimized conditions, which exhibit corrosion current density (Icorr: 1.04 × 10–5 μA cm–2) with high corrosion resistance of 7.03 × 102 Ω cm–2. Effect of anodization variables upon surface morphology, kinetic parameters, microstructural characteristics and thickness of anodized Al is evaluated. Gradient distribution of Si and O also indicates the relative content of silicate as illustrated by EDAX. Interpreted results from electrochemical impedance spectra and Tafel analysis are well-matched with physico-chemical analysis. Stable anodic Al layers comprising tailored morphology with high corrosion resistance are achieved under optimized conditions.

Keywords


Aluminium, Anodization, Corrosion Resistance, Sodium Oxalate, Sodium Silicate.

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DOI: https://doi.org/10.18520/cs%2Fv118%2Fi2%2F234-242