Citric Acid as an Alternative to Sulfuric Acid for the Hard-Anodizing of AA6061

Hard-anodized is a widely used method in the aeronautical sector to improve aluminum alloys abrasion and corrosion resistance. Aim of this work was to characterize the mechanical properties and resistance hard-anodized aluminum 6061 in citric acid solution as a replacement sulfuric acid solution wer...

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Autores principales:	José Cabral-Miramontes, Facundo Almeraya-Calderón, Francisco Estupinán López, María Lara Banda, Javier Olguín-Coca, Luis Daimir López-León, Ivan Castañeda-Robles, Miguel Ángel Esneider Alcalá, Patricia Zambrano-Robledo, Citlalli Gaona-Tiburcio
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	aluminum alloy corrosion EIS environmentally friendly citric acid Mining engineering. Metallurgy TN1-997
Acceso en línea:	https://doaj.org/article/8d5c7a027e784e56973fb9fc95351fbc
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spelling	oai:doaj.org-article:8d5c7a027e784e56973fb9fc95351fbc2021-11-25T18:22:19ZCitric Acid as an Alternative to Sulfuric Acid for the Hard-Anodizing of AA606110.3390/met111118382075-4701https://doaj.org/article/8d5c7a027e784e56973fb9fc95351fbc2021-11-01T00:00:00Zhttps://www.mdpi.com/2075-4701/11/11/1838https://doaj.org/toc/2075-4701Hard-anodized is a widely used method in the aeronautical sector to improve aluminum alloys abrasion and corrosion resistance. Aim of this work was to characterize the mechanical properties and resistance hard-anodized aluminum 6061 in citric acid solution as a replacement sulfuric acid solution were investigated. Aluminum alloy 6061 was used as the base material to produce the hard anodizing; this process was carried out in a citric and sulfuric acid solution, applying current densities 3 and 4.5 A/cm<sup>2</sup> and subsequently exposed to 3.5 wt. % NaCl solution. Microstructure and mechanical properties of the anodizing material were characterized by scanning electron microscopy (SEM) and Vickers microhardness (HV). Corrosion behavior of the hard-anodized material it was carried out with electrochemical techniques as cyclic potentiodynamic polarization (CPP) and electrochemical impedance spectroscopy (EIS) respectively. Results obtained indicated that all samples anodized in citric acid solution showed negative hysteresis and lower corrosion current density (1 × 10<sup>−10</sup> A/cm<sup>2</sup>), indicating generalized corrosion on the material surface. EIS results show that anodizing in citric acid solution and a current density of 4.5 A/dm<sup>2</sup> provides better corrosion protection than a sulfuric acid solution.José Cabral-MiramontesFacundo Almeraya-CalderónFrancisco Estupinán LópezMaría Lara BandaJavier Olguín-CocaLuis Daimir López-LeónIvan Castañeda-RoblesMiguel Ángel Esneider AlcaláPatricia Zambrano-RobledoCitlalli Gaona-TiburcioMDPI AGarticlealuminum alloycorrosionEISenvironmentally friendlycitric acidMining engineering. MetallurgyTN1-997ENMetals, Vol 11, Iss 1838, p 1838 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	aluminum alloy corrosion EIS environmentally friendly citric acid Mining engineering. Metallurgy TN1-997
spellingShingle	aluminum alloy corrosion EIS environmentally friendly citric acid Mining engineering. Metallurgy TN1-997 José Cabral-Miramontes Facundo Almeraya-Calderón Francisco Estupinán López María Lara Banda Javier Olguín-Coca Luis Daimir López-León Ivan Castañeda-Robles Miguel Ángel Esneider Alcalá Patricia Zambrano-Robledo Citlalli Gaona-Tiburcio Citric Acid as an Alternative to Sulfuric Acid for the Hard-Anodizing of AA6061
description	Hard-anodized is a widely used method in the aeronautical sector to improve aluminum alloys abrasion and corrosion resistance. Aim of this work was to characterize the mechanical properties and resistance hard-anodized aluminum 6061 in citric acid solution as a replacement sulfuric acid solution were investigated. Aluminum alloy 6061 was used as the base material to produce the hard anodizing; this process was carried out in a citric and sulfuric acid solution, applying current densities 3 and 4.5 A/cm<sup>2</sup> and subsequently exposed to 3.5 wt. % NaCl solution. Microstructure and mechanical properties of the anodizing material were characterized by scanning electron microscopy (SEM) and Vickers microhardness (HV). Corrosion behavior of the hard-anodized material it was carried out with electrochemical techniques as cyclic potentiodynamic polarization (CPP) and electrochemical impedance spectroscopy (EIS) respectively. Results obtained indicated that all samples anodized in citric acid solution showed negative hysteresis and lower corrosion current density (1 × 10<sup>−10</sup> A/cm<sup>2</sup>), indicating generalized corrosion on the material surface. EIS results show that anodizing in citric acid solution and a current density of 4.5 A/dm<sup>2</sup> provides better corrosion protection than a sulfuric acid solution.
format	article
author	José Cabral-Miramontes Facundo Almeraya-Calderón Francisco Estupinán López María Lara Banda Javier Olguín-Coca Luis Daimir López-León Ivan Castañeda-Robles Miguel Ángel Esneider Alcalá Patricia Zambrano-Robledo Citlalli Gaona-Tiburcio
author_facet	José Cabral-Miramontes Facundo Almeraya-Calderón Francisco Estupinán López María Lara Banda Javier Olguín-Coca Luis Daimir López-León Ivan Castañeda-Robles Miguel Ángel Esneider Alcalá Patricia Zambrano-Robledo Citlalli Gaona-Tiburcio
author_sort	José Cabral-Miramontes
title	Citric Acid as an Alternative to Sulfuric Acid for the Hard-Anodizing of AA6061
title_short	Citric Acid as an Alternative to Sulfuric Acid for the Hard-Anodizing of AA6061
title_full	Citric Acid as an Alternative to Sulfuric Acid for the Hard-Anodizing of AA6061
title_fullStr	Citric Acid as an Alternative to Sulfuric Acid for the Hard-Anodizing of AA6061
title_full_unstemmed	Citric Acid as an Alternative to Sulfuric Acid for the Hard-Anodizing of AA6061
title_sort	citric acid as an alternative to sulfuric acid for the hard-anodizing of aa6061
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/8d5c7a027e784e56973fb9fc95351fbc
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Citric Acid as an Alternative to Sulfuric Acid for the Hard-Anodizing of AA6061

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