Effect of Citric Acid Hard Anodizing on the Mechanical Properties and Corrosion Resistance of Different Aluminum Alloys

Hard anodizing is used to improve the anodic films' mechanical qualities and aluminum alloys' corrosion resistance. Applications for anodic oxide coatings on aluminum alloys include the space environment. In this work, the aluminum alloys 2024-T3 (Al-Cu), 6061-T6 (Al-Mg-Si), and 7075-T6 (A...

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Veröffentlicht in:Materials 2024-08, Vol.17 (17), p.4285
Hauptverfasser: Cabral-Miramontes, José, Almeraya-Calderón, Facundo, Méndez-Ramírez, Ce Tochtli, Flores-De Los Rios, Juan Pablo, Maldonado-Bandala, Erick, Baltazar-Zamora, Miguel Ángel, Nieves-Mendoza, Demetrio, Lara-Banda, María, Pedraza-Basulto, Gabriela, Gaona-Tiburcio, Citlalli
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container_issue 17
container_start_page 4285
container_title Materials
container_volume 17
creator Cabral-Miramontes, José
Almeraya-Calderón, Facundo
Méndez-Ramírez, Ce Tochtli
Flores-De Los Rios, Juan Pablo
Maldonado-Bandala, Erick
Baltazar-Zamora, Miguel Ángel
Nieves-Mendoza, Demetrio
Lara-Banda, María
Pedraza-Basulto, Gabriela
Gaona-Tiburcio, Citlalli
description Hard anodizing is used to improve the anodic films' mechanical qualities and aluminum alloys' corrosion resistance. Applications for anodic oxide coatings on aluminum alloys include the space environment. In this work, the aluminum alloys 2024-T3 (Al-Cu), 6061-T6 (Al-Mg-Si), and 7075-T6 (Al-Zn) were prepared by hard anodizing electrochemical treatment using citric and sulfur acid baths at different concentrations. The aim of the work is to observe the effect of citric acid on the microstructure of the substrate, the mechanical properties, the corrosion resistance, and the morphology of the hard anodic layers. Hard anodizing was performed on three different aluminum alloys using three citric-sulfuric acid mixtures for 60 min and using current densities of 3.0 and 4.5 A/dm . Vickers microhardness (HV) measurements and scanning electron microscopy (SEM) were utilized to determine the mechanical characteristics and microstructure of the hard anodizing material, and electrochemical techniques to understand the corrosion kinetics. The result indicates that the aluminum alloy 6061-T6 (Al-Mg-Si) has the maximum hard-coat thickness and hardness. The oxidation of Zn and Mg during the anodizing process found in the 7075-T6 (Al-Zn) alloy promotes oxide formation. Because of the high copper concentration, the oxide layer that forms on the 2024-T6 (Al-Cu) Al alloy has the lowest thickness, hardness, and corrosion resistance. Citric and sulfuric acid solutions can be used to provide hard anodizing in a variety of aluminum alloys that have corrosion resistance and mechanical qualities on par with or better than traditional sulfuric acid anodizing.
doi_str_mv 10.3390/ma17174285
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Applications for anodic oxide coatings on aluminum alloys include the space environment. In this work, the aluminum alloys 2024-T3 (Al-Cu), 6061-T6 (Al-Mg-Si), and 7075-T6 (Al-Zn) were prepared by hard anodizing electrochemical treatment using citric and sulfur acid baths at different concentrations. The aim of the work is to observe the effect of citric acid on the microstructure of the substrate, the mechanical properties, the corrosion resistance, and the morphology of the hard anodic layers. Hard anodizing was performed on three different aluminum alloys using three citric-sulfuric acid mixtures for 60 min and using current densities of 3.0 and 4.5 A/dm . Vickers microhardness (HV) measurements and scanning electron microscopy (SEM) were utilized to determine the mechanical characteristics and microstructure of the hard anodizing material, and electrochemical techniques to understand the corrosion kinetics. 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Citric and sulfuric acid solutions can be used to provide hard anodizing in a variety of aluminum alloys that have corrosion resistance and mechanical qualities on par with or better than traditional sulfuric acid anodizing.</description><identifier>ISSN: 1996-1944</identifier><identifier>EISSN: 1996-1944</identifier><identifier>DOI: 10.3390/ma17174285</identifier><identifier>PMID: 39274675</identifier><language>eng</language><publisher>Switzerland: MDPI AG</publisher><subject>Acid resistance ; Adsorption ; Aerospace environments ; Aircraft ; Alloys ; Aluminum alloys ; Aluminum base alloys ; Anodizing baths ; Citric acid ; Copper ; Corrosion effects ; Corrosion resistance ; Corrosion resistant alloys ; Diamond pyramid hardness ; Electrolytes ; Hard anodizing ; Ligands ; Magnesium ; Mechanical properties ; Metals ; Microstructure ; Morphology ; Oxidation ; Oxide coatings ; Pore size ; Protective coatings ; Reaction kinetics ; Silicon ; Substrates ; Sulfuric acid ; Sulfuric acid anodizing ; Thickness ; Zinc</subject><ispartof>Materials, 2024-08, Vol.17 (17), p.4285</ispartof><rights>2024 by the authors. 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The result indicates that the aluminum alloy 6061-T6 (Al-Mg-Si) has the maximum hard-coat thickness and hardness. The oxidation of Zn and Mg during the anodizing process found in the 7075-T6 (Al-Zn) alloy promotes oxide formation. Because of the high copper concentration, the oxide layer that forms on the 2024-T6 (Al-Cu) Al alloy has the lowest thickness, hardness, and corrosion resistance. 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Applications for anodic oxide coatings on aluminum alloys include the space environment. In this work, the aluminum alloys 2024-T3 (Al-Cu), 6061-T6 (Al-Mg-Si), and 7075-T6 (Al-Zn) were prepared by hard anodizing electrochemical treatment using citric and sulfur acid baths at different concentrations. The aim of the work is to observe the effect of citric acid on the microstructure of the substrate, the mechanical properties, the corrosion resistance, and the morphology of the hard anodic layers. Hard anodizing was performed on three different aluminum alloys using three citric-sulfuric acid mixtures for 60 min and using current densities of 3.0 and 4.5 A/dm . Vickers microhardness (HV) measurements and scanning electron microscopy (SEM) were utilized to determine the mechanical characteristics and microstructure of the hard anodizing material, and electrochemical techniques to understand the corrosion kinetics. The result indicates that the aluminum alloy 6061-T6 (Al-Mg-Si) has the maximum hard-coat thickness and hardness. The oxidation of Zn and Mg during the anodizing process found in the 7075-T6 (Al-Zn) alloy promotes oxide formation. Because of the high copper concentration, the oxide layer that forms on the 2024-T6 (Al-Cu) Al alloy has the lowest thickness, hardness, and corrosion resistance. 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subjects Acid resistance
Adsorption
Aerospace environments
Aircraft
Alloys
Aluminum alloys
Aluminum base alloys
Anodizing baths
Citric acid
Copper
Corrosion effects
Corrosion resistance
Corrosion resistant alloys
Diamond pyramid hardness
Electrolytes
Hard anodizing
Ligands
Magnesium
Mechanical properties
Metals
Microstructure
Morphology
Oxidation
Oxide coatings
Pore size
Protective coatings
Reaction kinetics
Silicon
Substrates
Sulfuric acid
Sulfuric acid anodizing
Thickness
Zinc
title Effect of Citric Acid Hard Anodizing on the Mechanical Properties and Corrosion Resistance of Different Aluminum Alloys
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