The paper discusses the influence of voltage pulse on the delayed action of AZ31B magnesium (Mg) alloy in MgSO₄–Mg(NO₃)₂ composite solution by using galvanostatic discharge and electrochemical impedance spectroscopy for the first time. The peak potential of Mg anode applied with pulse signal is only −1.25 V, which reduces by ~2 V compared to the Mg electrode without pulse (+0.8 V). The potential dip of Mg anodes without and with pulse load are ~1.88 V and ~0.06 V, respectively. Furthermore, the superior discharge behaviors of Mg electrode can be maintained despite that immersion time length is extended to 10 days at the pulse signal of −1.0 V - 100 ms. Finally, the surface morphology and composition of Mg alloys are analyzed by scanning electron microscopy and X-ray photoelectron spectroscopy. The results show that voltage pulse has a slightly impact on the composition of surface products, whereas, it improves the electrochemical properties of Mg electrode in aqueous solution by destroy the outer layer while does not affect the inner film.

本文讨论了电压脉冲对AZ31B镁（Mg）合金在MgSO ₄ -Mg（NO ₃）_2中的延迟作用的影响。首次通过恒电流放电和电化学阻抗谱分析复合溶液。带有脉冲信号的Mg阳极的峰值电势仅为-1.25 V，与没有脉冲的Mg电极（+0.8 V）相比，降低了〜2V。带有和不带有脉冲负载的Mg阳极的电位降分别为〜1.88 V和〜0.06V。此外，尽管在-1.0 V-100 ms的脉冲信号下将浸入时间长度延长至10天，但仍可以保持Mg电极优异的放电性能。最后，通过扫描电子显微镜和X射线光电子能谱分析了镁合金的表面形貌和组成。结果表明，电压脉冲对表面产物的组成有轻微影响，而