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Título
Comparative Study on Microstructure and Corrosion Resistance of Al-Si Alloy Cast from Sand Mold and Binder Jetting Mold
Autor
Facultad/Centro
Área de conocimiento
Título de la revista
Metals
Número de la revista
9
Cita Bibliográfica
Castro-Sastre, M. Á., García-Cabezón, C., Fernández-Abia, A. I., Martín-Pedrosa, F., & Barreiro, J. (2021). Comparative study on microstructure and corrosion resistance of al-si alloy cast from sand mold and binder jetting mold. Metals, 11(9). https://doi.org/10.3390/MET11091421
Editorial
MDPI
Fecha
2021-09-08
Resumen
[EN] 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.
Materia
Palabras clave
Peer review
SI
ID proyecto
- info:eur-repo/grantAgreement/AEI/Programa Estatal de I+D+i Orientada a los Retos de la Sociedad/DPI2017- 89840-R/ES/SISTEMATIZACION DE LA FABRICACION PERSONALIZADA DE MOLDES MEDIANTE FABRICACION ADITIVA 3DP Y DE SU INSPECCION CON METROLOGIA OPTICA
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