Abstract
The effect of anodizing temperature (10–50°C) at each particular stage of the anodizing process of the commercial AA5052 in 0.4 M H3PO4 at 30 V is studied in relation to the concentration of Mg species in the oxide layer. An advantageous behavior of the alloy is observed in comparison with pure aluminum, especially at 30°C. However, an impediment of anodizing is observed, leading to a reduction of the benefits of AA5052, which is correlated with a reduction in the Mg/(Mg + Al) atomic ratio for the oxide layer compared to the bulk alloy estimated by SEM/EDS analysis. These phenomena become more intense as the anodizing time and temperature rise. For example, a thrice higher oxide layer thickness at stage III in comparison with pure aluminum becomes twice higher at stage IV at 30°C. The duration of stage III is affected, but not that of stages I and II, which are completed in a short time and in which only a slight retardation of the increase in the density of the consumed electric charge was observed. The porosity increases with time but at the end of stage III reduces slightly, at T above 30°C, in spite of the general aspect that it remains stable or increases slightly with temperature.
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ACKNOWLEDGMENTS
Authors gratefully acknowledge the assistance of Th. Karampotsos, Department of Antiquities and Works of Art Conservation, University of West Attica, Athens, Greece, for SEM analysis.
Funding
This work is a part of the Internal Programme for the Support of the Technological Educational Institute of Athens Researchers, for 2015 and financed by the Special Account for Research Grants of the University of West Attica.
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Stamatina Theohari, Chrysa Kontogeorgou Study of Electrochemical Behavior of Commercial AA5052 during Anodizing in Phosphoric Acid Solution in Relation to Mg Species Content in Films. Surf. Engin. Appl.Electrochem. 56, 71–82 (2020). https://doi.org/10.3103/S1068375520010159
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DOI: https://doi.org/10.3103/S1068375520010159