The corrosion behavior of pure Mg17Al12 and the effect of ball milling in presence of additives (i.e. graphite (G) and magnesium chloride (MgCl2)) are evaluated in 3.5 wt% NaCl aqueous solution using electrochemical polarization and impedance measurements. Pure Mg17Al12 and milled Mg17Al12 without additives and with MgCl2 present an open current potential (OCP) of −1.2 V/SCE while Mg17Al12 + G shows a slightly higher OCP (+10% maximum). Mg17Al12 corrodes with low kinetics and an increase of corrosion rate for the milled Mg17Al12 is observed. The corrosion current densities (Jcorr) derived from the Tafel plots, exhibit their corrosion reactivity as follow: Mg17Al12 < Mg17Al12 5h < Mg17Al12 + G 5h < Mg17Al12 + MgCl2 5h. Electrochemical impedance spectroscopy (EIS) results are in good agreement with the measured Jcorr. Randles circuit models are established for all samples to explain their surface behavior in the aqueous NaCl solution. The variation of the fitted parameters is attributed either to the effect of ball milling or to the effect of the additive. Our results are helpful in elucidating the effect of ball milling and the additives.

中文翻译：

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DECLIC 和 DECLIC-Evo 中的超临界水 (SCW) 调查：过去、现在和未来

使用电化学极化和阻抗测量在 3.5 wt% NaCl 水溶液中评估纯 Mg17Al12 的腐蚀行为和球磨在添加剂（即石墨 (G) 和氯化镁 (MgCl2)）存在下的影响。纯 Mg17Al12 和研磨 Mg17Al12 不含添加剂和 MgCl2 的开路电流电位 (OCP) 为 -1.2 V/SCE，而 Mg17Al12 + G 的开路电流电位 (OCP) 略高（最大值 +10%）。Mg17Al12 以低动力学腐蚀，观察到研磨后的 Mg17Al12 腐蚀速率增加。由 Tafel 图导出的腐蚀电流密度 (Jcorr) 显示其腐蚀反应性如下：Mg17Al12 < Mg17Al12 5h < Mg17Al12 + G 5h < Mg17Al12 + MgCl2 5h。电化学阻抗谱 (EIS) 结果与测量的 Jcorr 非常吻合。为所有样品建立了兰德尔电路模型，以解释它们在 NaCl 水溶液中的表面行为。拟合参数的变化归因于球磨的影响或添加剂的影响。我们的结果有助于阐明球磨和添加剂的影响。