Experimental and theoretical approach of the hydrolysis of pelleted magnesium alloys scraps

Quentin Gouty (1) , Facundo J. Castro (2, 3) , Guillermina Urretavizcaya (2, 3) , Jocelyn Sabatier (4) , Jean-Louis Bobet (1)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
2 Instituto Balseiro [Bariloche]
3 Centro Atómico Bariloche [Argentine]
4 IMS - Laboratoire de l'intégration, du matériau au système

Industrial Mg alloys scraps containing 3% of Al and 3% of Zn (and about 20% of MgO and Mg(OH)2) were ball milled with the addition of 5wt.% C and 5 wt.% of Ni, Cu, Co or SiO2. 3 hours of ball milling were needed to obtain optimum hydrolysis performances of the mixtures (e.g. yields of almost 90% obtained within 1 minute). Pellets of such obtained powder were prepared as it is easier for an application. The shape of the hydrolysis curves highlights first an incubation period depending on the compactness of the pellets and then a second part with a logarithmic shape. A new model is presented that allows to take into account both parts of the hydrolysis curve. The model is applied successfully to all the pellets having various compactness.

Mots clés: Hydrolysis; Magnesium alloys scraps; compactness; models

Domaines: Matériaux; Chimie inorganique

Quentin Gouty, Facundo J. Castro, Guillermina Urretavizcaya, Jocelyn Sabatier, Jean-Louis Bobet. Experimental and theoretical approach of the hydrolysis of pelleted magnesium alloys scraps. Journal of Alloys and Compounds, 2022, 919, pp.165784. ⟨10.1016/j.jallcom.2022.165784⟩. ⟨hal-03709793⟩