Publicou 4 edições por ano
ISSN Imprimir: 1093-3611
ISSN On-line: 1940-4360
Indexed in
INFLUENCE OF THE ANODIZING TEMPERATURE ON THE MECHANICAL PROPERTIES OF HIGHLY POROUS ANODIC ALUMINA OBTAINED USING HIGH-VOLTAGE ELECTROCHEMICAL OXIDATION
RESUMO
The aim of this paper is to study the influence of the electrolyte temperature on the porosity of the AMg2 (Al 5052) aluminum alloy and also to obtain a highly ordered porous anodic alumina (PAA) with adjustable pore sizes by using high-voltage electrochemical oxidation of the mixture of phosphoric, boric, and oxalic acids. The surface morphology and elemental composition of PAA are characterized by scanning electron microscopy (SEM) and energy-dispersive X-ray spectrometry (EDS). Moreover, the pore formation mechanism is also discussed. The results show that the nanopore arrays in all the PAA samples are in a highly regular arrangement and the pore size ranges between 50−240 nm. However, pore widening due to chemical dissolution of the oxide by the electrolyte led to films with cone-shaped pores (hexagonal shapes or a honeycomb-like structure). This phenomenon became more pronounced with increasing electrolyte temperature. EDS analysis suggests that the main elements of the PAA are oxygen, aluminum, and a small amount of phosphorus, carbon, sodium, and magnesium.
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Nmadu D., Eli-Chukwu N.C., Uma U. U., Ogah O. E., Parshuto A. A., Eheduru M. I., Ezichi S. I., Ogbonna-Mba C. N., Using High Voltage Electrochemical Oxidation (HVEO) to obtain protective coatings, surface finishing on electronic materials, Digest Journal of Nanomaterials and Biostructures, 17, 2, 2022. Crossref