Four-dimensional (4D) electrochemical impedance spectroscopy was applied to clarify the role of microstructures on the corrosion behaviour of Al-Si alloys additively manufactured by laser powder bed fusion in the immersion of NaCl solution. 3D complex impedance plots, comprising real, imaginary, and time axes, indicate that the impedance increases gradually at initial stage and then does not show apparent time variation. These behaviours, following surface morphology analysis, are strongly related to the remaining fine silicon particles on the surface due to the preferential Al dissolution, which suppress the further dissolution from underlying along with the protective oxide film formation.

中文翻译：

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四维电化学阻抗谱：微观结构对激光粉末床熔融增材制造铝硅合金腐蚀行为的作用

采用四维 (4D) 电化学阻抗谱阐明了微观结构对激光粉末床熔融增材制造的 Al-Si 合金在 NaCl 溶液中的腐蚀行为的影响。 3D复阻抗图，包括实轴、虚轴和时间轴，表明阻抗在初始阶段逐渐增加，然后没有表现出明显的时间变化。根据表面形貌分析，这些行为与表面上剩余的细硅颗粒密切相关，因为铝优先溶解，这抑制了底层的进一步溶解以及保护性氧化膜的形成。