Influences of alloying elements and dendritic spacing on the corrosion behavior of Al–Si–Ag alloys

The most important commercial casting alloys are those based on Al–Si. Their technical characteristics are highly connected to their as-cast microstructure, which is translated by the secondary dendrite arm spacing (SDAS). The alloy microstructure has been demonstrated to be changed by the adding of...

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Autores principales:	Leonardo Fernandes Gomes, Cristie Luis Kugelmeier, Amauri Garcia, Carlos Alberto Della Rovere, José Eduardo Spinelli
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Corrosion Solidification Dendritic growth Al–Si alloys Al–Si–Ag alloys Mining engineering. Metallurgy TN1-997
Acceso en línea:	https://doaj.org/article/4cf7960ab6ff4ed1a7a1ae99617a7065
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spelling	oai:doaj.org-article:4cf7960ab6ff4ed1a7a1ae99617a70652021-11-28T04:32:36ZInfluences of alloying elements and dendritic spacing on the corrosion behavior of Al–Si–Ag alloys2238-785410.1016/j.jmrt.2021.11.043https://doaj.org/article/4cf7960ab6ff4ed1a7a1ae99617a70652021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2238785421013223https://doaj.org/toc/2238-7854The most important commercial casting alloys are those based on Al–Si. Their technical characteristics are highly connected to their as-cast microstructure, which is translated by the secondary dendrite arm spacing (SDAS). The alloy microstructure has been demonstrated to be changed by the adding of certain alloying elements, in the sense of boosting the desired properties and features. Search has been intensified to provide a positive balance of several properties, such as: high yield strength, high electrical conductivity, and high corrosion resistance, besides maintaining the ability for the alloy to be conventionally solidified. Under such context, both addition of Ag and the control of the fineness of the dendritic structure can be alternatives seeking better properties for Al–Si alloys. In addition to the possibility of application in current studies contributing to the growing development needs as engine materials, Al–Si–Ag alloys can emerge as an alternative to the manufacture of parts for electric vehicles, such as rotors and inverters, where high mechanical strength, corrosion resistance and electrical conductivity are required. Corrosion findings of Al–Si–Ag specimens having quite different SDAS of five alloys are presented here: Al-5wt.% Si, Al-5wt.% Si-0.1wt.% Ag, Al-10wt.% Si-0.1wt.% Ag, Al-5wt.% Si-2wt.% Ag, Al-10wt.%Si-2wt.%Ag alloys. A complete set of characterization with potentiodynamic polarization, electrochemical impedance spectroscopy, immersion tests, optical microscopy and scanning electron microscopy (SEM) was developed for these alloys. It has been demonstrated that increase in the alloy Si content diminishes corrosion resistance, and that increase in Ag content, considering Al-10% Si alloys, reduces corrosion resistance as well, despite creating thicker passive films. Furthermore, the alloys with the lowest Ag content (0.1 wt.%) had the greatest corrosion performance among the Ag-containing alloys, while the microstructure refinement tends to enhance the nobility of the samples.Leonardo Fernandes GomesCristie Luis KugelmeierAmauri GarciaCarlos Alberto Della RovereJosé Eduardo SpinelliElsevierarticleCorrosionSolidificationDendritic growthAl–Si alloysAl–Si–Ag alloysMining engineering. MetallurgyTN1-997ENJournal of Materials Research and Technology, Vol 15, Iss , Pp 5880-5893 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Corrosion Solidification Dendritic growth Al–Si alloys Al–Si–Ag alloys Mining engineering. Metallurgy TN1-997
spellingShingle	Corrosion Solidification Dendritic growth Al–Si alloys Al–Si–Ag alloys Mining engineering. Metallurgy TN1-997 Leonardo Fernandes Gomes Cristie Luis Kugelmeier Amauri Garcia Carlos Alberto Della Rovere José Eduardo Spinelli Influences of alloying elements and dendritic spacing on the corrosion behavior of Al–Si–Ag alloys
description	The most important commercial casting alloys are those based on Al–Si. Their technical characteristics are highly connected to their as-cast microstructure, which is translated by the secondary dendrite arm spacing (SDAS). The alloy microstructure has been demonstrated to be changed by the adding of certain alloying elements, in the sense of boosting the desired properties and features. Search has been intensified to provide a positive balance of several properties, such as: high yield strength, high electrical conductivity, and high corrosion resistance, besides maintaining the ability for the alloy to be conventionally solidified. Under such context, both addition of Ag and the control of the fineness of the dendritic structure can be alternatives seeking better properties for Al–Si alloys. In addition to the possibility of application in current studies contributing to the growing development needs as engine materials, Al–Si–Ag alloys can emerge as an alternative to the manufacture of parts for electric vehicles, such as rotors and inverters, where high mechanical strength, corrosion resistance and electrical conductivity are required. Corrosion findings of Al–Si–Ag specimens having quite different SDAS of five alloys are presented here: Al-5wt.% Si, Al-5wt.% Si-0.1wt.% Ag, Al-10wt.% Si-0.1wt.% Ag, Al-5wt.% Si-2wt.% Ag, Al-10wt.%Si-2wt.%Ag alloys. A complete set of characterization with potentiodynamic polarization, electrochemical impedance spectroscopy, immersion tests, optical microscopy and scanning electron microscopy (SEM) was developed for these alloys. It has been demonstrated that increase in the alloy Si content diminishes corrosion resistance, and that increase in Ag content, considering Al-10% Si alloys, reduces corrosion resistance as well, despite creating thicker passive films. Furthermore, the alloys with the lowest Ag content (0.1 wt.%) had the greatest corrosion performance among the Ag-containing alloys, while the microstructure refinement tends to enhance the nobility of the samples.
format	article
author	Leonardo Fernandes Gomes Cristie Luis Kugelmeier Amauri Garcia Carlos Alberto Della Rovere José Eduardo Spinelli
author_facet	Leonardo Fernandes Gomes Cristie Luis Kugelmeier Amauri Garcia Carlos Alberto Della Rovere José Eduardo Spinelli
author_sort	Leonardo Fernandes Gomes
title	Influences of alloying elements and dendritic spacing on the corrosion behavior of Al–Si–Ag alloys
title_short	Influences of alloying elements and dendritic spacing on the corrosion behavior of Al–Si–Ag alloys
title_full	Influences of alloying elements and dendritic spacing on the corrosion behavior of Al–Si–Ag alloys
title_fullStr	Influences of alloying elements and dendritic spacing on the corrosion behavior of Al–Si–Ag alloys
title_full_unstemmed	Influences of alloying elements and dendritic spacing on the corrosion behavior of Al–Si–Ag alloys
title_sort	influences of alloying elements and dendritic spacing on the corrosion behavior of al–si–ag alloys
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/4cf7960ab6ff4ed1a7a1ae99617a7065
work_keys_str_mv	AT leonardofernandesgomes influencesofalloyingelementsanddendriticspacingonthecorrosionbehaviorofalsiagalloys AT cristieluiskugelmeier influencesofalloyingelementsanddendriticspacingonthecorrosionbehaviorofalsiagalloys AT amaurigarcia influencesofalloyingelementsanddendriticspacingonthecorrosionbehaviorofalsiagalloys AT carlosalbertodellarovere influencesofalloyingelementsanddendriticspacingonthecorrosionbehaviorofalsiagalloys AT joseeduardospinelli influencesofalloyingelementsanddendriticspacingonthecorrosionbehaviorofalsiagalloys
_version_	1718408314022264832

Influences of alloying elements and dendritic spacing on the corrosion behavior of Al–Si–Ag alloys

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