## 3 Results and Discussion
### Microstructure of Hydrolytic Alloys
Therefore, Mg-Zn alloys with high zinc content can undergo almost simultaneous complete hydrolysis reactions on both the external and internal metals within the shortest time. After the high-temperature reaction, the EDS images show the presence of magnesium, zinc, and oxygen elements, which is consistent with the XRD pattern in Figure 9c, further confirming that the hydrolysis products of pure magnesium under high-temperature conditions are MgO and ZnO. Figure 11: The SEM and EDS images of the reaction products of (**a**) Mg-10 Al, (**b**) Mg-20 Al, and (**c**) Mg-30 Al. Ultimately, a comparative investigation was carried out on the hydrogen production performance via hydrolysis of pure Mg, Mg-30 wt.%Al, and Mg-30 wt.%Zn alloys, as shown in Table 5. Regarding the critical temperature requisite for the reaction, the critical reaction temperature of pure Mg is the highest, attaining 520 \({}^{\circ}\)C. That of Mg-30 wt.%Al is at an intermediate state, being 420 \({}^{\circ}\)C, while the critical reaction temperature of Mg-30 wt.%Zn is the lowest, merely 300 \({}^{\circ}\)C, which represents a significant reduction of 220 \({}^{\circ}\)C compared to pure Mg. From the perspective of the final hydrogen conversion rate, the conversion rate of Mg-30 wt.%Zn is as high as 98%. The final conversion rate of Mg-30 wt.%Al is slightly lower, at 97%, whereas that of pure Mg is only 94%. In terms of the complete reaction time and induction time, under the operating condition of its critical reaction temperature of 520 \({}^{\circ}\)C, the complete reaction time and induction time of pure Mg are 123 s and 360 s, respectively. For Mg-30 wt.%Al, under the operating condition of its critical reaction temperature of 420 \({}^{\circ}\)C, both the reaction time and induction time are decreased, dropping to 117 s and 270 s, respectively. For Mg-30 wt.%Zn, under the operating condition of its critical reaction temperature of 300 \({}^{\circ}\)C, the reaction time and induction time are also reduced, being 115 s and 225 s, respectively. Although the variation range of the reaction time is not remarkable, the downward trend of the induction time is extremely prominent. The decrease in the critical reaction temperature, the enhancement of the hydrogen production conversion rate, and the shortening of the reaction time and induction time are all intuitive manifestations of the superiority or inferiority of the performance of hydrogen production via hydrolysis. Herein, compared with pure Mg, both Mg-30 wt.%Al and Mg-30 wt.%Zn exhibit more excellent hydrogen production performance via hydrolysis, among which Mg-30 wt.%Zn has the most outstanding hydrogen production performance via hydrolysis. \begin{table}
\begin{tabular}{c c c c c} \hline \hline \multirow{2}{*}{**Samples**} & **Critical Reaction** & **Conversion** & **Reaction** & **Induction** \\  & **Temperature (\({}^{\circ}\)C)** & **Yield (\%)** & **Time (s)** & **Time (s)** \\ \hline Pure-Mg & 520 & 94 & 123 & 360 \\ Mg-30 Al & 420 & 97 & 117 & 270 \\ Mg-30 Zn & 300 & 98 & 115 & 225 \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Comparison of the hydrogen production performance through hydrolysis of pure Mg, Mg-30 wt.%Al alloy, and Mg-30 wt.%Zn alloy. Figure 12: The SEM and EDS images of the reaction products of (**a**) Mg-10 Zn, (**b**) Mg-20 Zn, and (c) Mg-30 Zn.