This work proposes a new modeling of hydrolysis reaction in simulated seawater solution (35 g/L NaCl) with alloys containing alpha-Mg and Long Period Stacking Ordered (LPSO) phases. Alloys with different chemical compositions or thermal treatments were synthesized, leading to different (i) microstructures, (ii) alpha-Mg over LPSO phase fractions or (iii) LPSO type (18R or 14H). Classical nucleation and growth equation is used as an indicator of the reaction mechanisms but a new model is proposed to describe the complex kinetics curves (Vol (H-2) = f(t)) obtained. This new model has several advantages: (i) it allows to discriminate the contribution of each phase, (ii) it could be applied to any alloy with phases reacting and (iii) it applies to the whole kinetics curves (i.e. from 0 to 100 yield). It is supported by the comparisons between the different alloys and SEM observations of their microstructure before and after exposure to the seawater solution. (C) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
展开▼
