Distinction of corrosion resistance of selective laser melted Al-12Si alloy on different planes
Document Type
Journal Article
Publication Title
Journal of Alloys and Compounds
Publisher
Elsevier
Place of Publication
Netherlands
School
School of Engineering
RAS ID
26720
Abstract
Electrochemical measurements and microstructural studies were carried out to investigate the corrosion behaviour of the different planes for the Al-12Si alloy produced by selective laser melting (SLM). The electrochemical results demonstrate that the building direction plane (XZ-plane) of the SLM-produced alloy exhibits better corrosion resistance in comparison with the building plane (XY-plane) in 3.5 wt% NaCl solution. The relatively inferior corrosion resistance of the XY-plane is ascribed to that the grown corrosion products extrude the deep and small-bore Si shells on the aluminum substrate, thereby causing the crack of Si shells. Without such a cover of the Si shells, the Cl− would continuously penetrate into the aluminum substrate and ultimately induce occurrence of the severe pitting. As for the XZ-plane, the corrosion products cannot grow and deposit in its shallow and large-bore Si shells, instead of transferring to the testing solution. The undamaged Si shells and formed oxide film constitute a protective layer to protect the aluminum substrate from the attack of Cl−, thereby displaying superior corrosion behaviour for the XZ-plane
DOI
10.1016/j.jallcom.2018.03.062
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Comments
Chen, Y., Zhang, J., Gu, X., Dai, N., Qin, P., & Zhang, L. C. (2018). Distinction of corrosion resistance of selective laser melted Al-12Si alloy on different planes. Journal of Alloys and Compounds. 747, 648-658. Available here.