Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 747, Issue -, Pages 648-658Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.03.062
Keywords
Selective laser melting; Corrosion resistance; Al-12Si alloy; Si shells; Microstructure
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Funding
- Australian Research Council [DP110101653]
- Project of Shanghai Science and Technology Commission [14DZ2261000]
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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. (C) 2018 Elsevier B.V. All rights reserved.
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