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Article

Comparative Study on Microstructure and Corrosion Resistance of Al-Si Alloy Cast from Sand Mold and Binder Jetting Mold

1
Department of Mechanical, Informatics and Aerospace Engineering, Campus de Vegazana, University of León, 24071 León, Spain
2
Materials Engineering, E.I.I., Universidad de Valladolid, 47011 Valladolid, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Atila Ertas
Metals 2021, 11(9), 1421; https://doi.org/10.3390/met11091421
Received: 26 July 2021 / Revised: 24 August 2021 / Accepted: 31 August 2021 / Published: 8 September 2021
(This article belongs to the Special Issue Additive Manufacturing Research and Applications)
This investigation is focused on the corrosion evaluation of an as-cast Al-Si alloy, obtained by two different casting methods: traditional sand casting and three-printing casting, using a binder jetted mold. The experimental results are discussed in terms of chemical composition, microstructure, hardness, and corrosion behavior of two different casting parts. The microstructure and composition of the sample before and after the corrosion tests was analyzed using light microscopy (OM), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDX) and X-ray diffraction (DRX). The corrosion of the two processed castings was analyzed using anodic polarization (PA) test and electrochemical impedance spectroscopy (EIS) in an aerated solution of 3.5% by weight NaCl, similar to the seawater environment. After the corrosion process, the samples were analyzed by inductively coupled plasma/optical emission spectrometry (ICP/OES); the composition was used to determine the chloride solution after immersion times. The sample processed by binder jetting mold showed higher corrosion resistance with nobler potentials, lower corrosion densities, higher polarization resistance, and more stable passive layers than the sample processed by sand casting. This improvement of corrosion resistance could be related to the presence of coarse silicon particles, which decrease of cathodic/anodic ratio and the number of micro-galvanic couples, and the lower amount of intermetallic β Al-Fe-Si phase observed in cast alloy solidified in binder jetting mold. View Full-Text
Keywords: binder jetting; sand casting; aluminum alloy; microstructure; corrosion binder jetting; sand casting; aluminum alloy; microstructure; corrosion
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MDPI and ACS Style

Castro-Sastre, M.Á.; García-Cabezón, C.; Fernández-Abia, A.I.; Martín-Pedrosa, F.; Barreiro, J. Comparative Study on Microstructure and Corrosion Resistance of Al-Si Alloy Cast from Sand Mold and Binder Jetting Mold. Metals 2021, 11, 1421. https://doi.org/10.3390/met11091421

AMA Style

Castro-Sastre MÁ, García-Cabezón C, Fernández-Abia AI, Martín-Pedrosa F, Barreiro J. Comparative Study on Microstructure and Corrosion Resistance of Al-Si Alloy Cast from Sand Mold and Binder Jetting Mold. Metals. 2021; 11(9):1421. https://doi.org/10.3390/met11091421

Chicago/Turabian Style

Castro-Sastre, María Á., Cristina García-Cabezón, Ana I. Fernández-Abia, Fernando Martín-Pedrosa, and Joaquín Barreiro. 2021. "Comparative Study on Microstructure and Corrosion Resistance of Al-Si Alloy Cast from Sand Mold and Binder Jetting Mold" Metals 11, no. 9: 1421. https://doi.org/10.3390/met11091421

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