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Anodization Mechanism on SiC Nanoparticle Reinforced Al Matrix Composites Produced by Power Metallurgy

Specimens of aluminum-based composites reinforced by silicon carbide nanoparticles (Al/SiC(np)) produced by powder metallurgy (PM) were anodized under voltage control in tartaric-sulfuric acid (TSA). In this work, the influence of the amount of SiC(np) on the film growth during anodizing was investi...

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Autores principales: Ferreira, Sonia C., Conde, Ana, Arenas, María A., Rocha, Luis A., Velhinho, Alexandre
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5456428/
https://www.ncbi.nlm.nih.gov/pubmed/28788295
http://dx.doi.org/10.3390/ma7128151
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author Ferreira, Sonia C.
Conde, Ana
Arenas, María A.
Rocha, Luis A.
Velhinho, Alexandre
author_facet Ferreira, Sonia C.
Conde, Ana
Arenas, María A.
Rocha, Luis A.
Velhinho, Alexandre
author_sort Ferreira, Sonia C.
collection PubMed
description Specimens of aluminum-based composites reinforced by silicon carbide nanoparticles (Al/SiC(np)) produced by powder metallurgy (PM) were anodized under voltage control in tartaric-sulfuric acid (TSA). In this work, the influence of the amount of SiC(np) on the film growth during anodizing was investigated. The current density versus time response and the morphology of the porous alumina film formed at the composite surface are compared to those concerning a commercial aluminum alloy (AA1050) anodized under the same conditions. The processing method of the aluminum alloys influences the efficiency of the anodizing process, leading to a lower thicknesses for the unreinforced Al-PM alloy regarding the AA1050. The current density versus time response is strongly dependent on the amount of SiC(np). The current peaks and the steady-state current density recorded at each voltage step increases with the SiC(np) volume fraction due to the oxidation of the SiC(np). The formation mechanism of the anodic film on Al/SiC(np) composites is different from that occurring in AA1050, partly due the heterogeneous distribution of the reinforcement particles in the metallic matrix, but also to the entrapment of SiC(np) in the anodic film.
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spelling pubmed-54564282017-07-28 Anodization Mechanism on SiC Nanoparticle Reinforced Al Matrix Composites Produced by Power Metallurgy Ferreira, Sonia C. Conde, Ana Arenas, María A. Rocha, Luis A. Velhinho, Alexandre Materials (Basel) Article Specimens of aluminum-based composites reinforced by silicon carbide nanoparticles (Al/SiC(np)) produced by powder metallurgy (PM) were anodized under voltage control in tartaric-sulfuric acid (TSA). In this work, the influence of the amount of SiC(np) on the film growth during anodizing was investigated. The current density versus time response and the morphology of the porous alumina film formed at the composite surface are compared to those concerning a commercial aluminum alloy (AA1050) anodized under the same conditions. The processing method of the aluminum alloys influences the efficiency of the anodizing process, leading to a lower thicknesses for the unreinforced Al-PM alloy regarding the AA1050. The current density versus time response is strongly dependent on the amount of SiC(np). The current peaks and the steady-state current density recorded at each voltage step increases with the SiC(np) volume fraction due to the oxidation of the SiC(np). The formation mechanism of the anodic film on Al/SiC(np) composites is different from that occurring in AA1050, partly due the heterogeneous distribution of the reinforcement particles in the metallic matrix, but also to the entrapment of SiC(np) in the anodic film. MDPI 2014-12-19 /pmc/articles/PMC5456428/ /pubmed/28788295 http://dx.doi.org/10.3390/ma7128151 Text en © 2014 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Ferreira, Sonia C.
Conde, Ana
Arenas, María A.
Rocha, Luis A.
Velhinho, Alexandre
Anodization Mechanism on SiC Nanoparticle Reinforced Al Matrix Composites Produced by Power Metallurgy
title Anodization Mechanism on SiC Nanoparticle Reinforced Al Matrix Composites Produced by Power Metallurgy
title_full Anodization Mechanism on SiC Nanoparticle Reinforced Al Matrix Composites Produced by Power Metallurgy
title_fullStr Anodization Mechanism on SiC Nanoparticle Reinforced Al Matrix Composites Produced by Power Metallurgy
title_full_unstemmed Anodization Mechanism on SiC Nanoparticle Reinforced Al Matrix Composites Produced by Power Metallurgy
title_short Anodization Mechanism on SiC Nanoparticle Reinforced Al Matrix Composites Produced by Power Metallurgy
title_sort anodization mechanism on sic nanoparticle reinforced al matrix composites produced by power metallurgy
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5456428/
https://www.ncbi.nlm.nih.gov/pubmed/28788295
http://dx.doi.org/10.3390/ma7128151
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