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Type: Artigo
Title: Correlation between microstructure and corrosion behaviour of Bi-Zn solder alloys
Author: Septimio, Rudimylla S.
Arenas, Maria A.
Conde, Ana
Garcia, Amauri
Cheung, Noe
de Damborenea, Juan
Abstract: Bi-Zn solder alloys with different Zn contents (1.5, 2.7 and 5wt-%) were prepared by casting and the correlation between the microstructure and corrosion behaviour by mean of direct current electrochemical tests was studied. The surface analysis of the hypoeutectic Bi-Zn alloy samples revealed the presence of needle-like ZnO and very small agglomerated spherical particles. By contrast, eutectic alloy presented the formation of a uniform and compact film of ZnO, which is related to the better distribution of Zinc in the Bi-rich matrix. Despite the increase in Zn content compared to the hypoeutectic alloy, the corrosion rate showed similar values regardless of its content in the alloy. The Bi-5wt-% Zn alloy presented the highest limiting current density, and consequently, the highest degree of corrosion of the studied alloys. The pro-eutectic phase consisting of large and thick Zn fibres is preferentially dissolved, promoting a selective attack that penetrates inside the sample
Subject: Ligas (Metalurgia)
Country: Reino Unido
Editor: Taylor & Francis
Rights: Fechado
Identifier DOI: 10.1080/1478422X.2019.1600836
Date Issue: 2019
Appears in Collections:FEM - Artigos e Outros Documentos

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