Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Improvement of the secondary aluminium metallurgical quality by means of an adequate melt treatment.

Version 1 : Received: 15 June 2021 / Approved: 16 June 2021 / Online: 16 June 2021 (08:58:00 CEST)

A peer-reviewed article of this Preprint also exists.

Bakedano, A.; Niklas, A.; Fernández-Calvo, A.I.; Plata, G.; Lozares, J.; Berlanga-Labari, C. Comparative Study of the Metallurgical Quality of Primary and Secondary AlSi10MnMg Aluminium Alloys. Metals 2021, 11, 1147. Bakedano, A.; Niklas, A.; Fernández-Calvo, A.I.; Plata, G.; Lozares, J.; Berlanga-Labari, C. Comparative Study of the Metallurgical Quality of Primary and Secondary AlSi10MnMg Aluminium Alloys. Metals 2021, 11, 1147.

Journal reference: Metals 2021, 11, 1147
DOI: 10.3390/met11071147

Abstract

This work has the purpose to demonstrate that if an adequate melt treatment is applied, it is pos-sible to obtain recycled aluminium alloy AlSi10MnMg(Fe) with as good metal cleanliness than primary AlSi10MnMg alloy. The melt quality is assessed by the thermal analysis, density index, macro- and micro-inclusions tests, of one primary and two secondary alloys, before and after the melt treatment. The melt treatment is based on deoxidation, degassing and skimming with de-tailed procedure described in this article. The different analysis are: Thermal analysis to compare the variables of the solidification cooling curve (Al primary temperature and its undercooling; Al-Si eutectic temperature and its recalescence); Density index is used to evaluate the hydrogen gas content in the melt; Macroinclusions level is analysed after solidifying the melt under vacuum of 5 mbar, favouring inclusion floatation to the sample surface; Microinclusion level is evaluate with porous disc filtration apparatus (similar to PoDFA).

Subject Areas

melt cleanliness, secondary alloy; primary alloy; density index; inclusions; AlSi10MnMg alloy

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