High roughness of metal structures made by selective laser melting restricted their extensive applications. A strategy of overpotential electrochemical polishing was developed for effectively smoothening three-dimensional (3D)-printed surfaces, particularly for removing sticking particles. Average surface roughness of 0.18 µm was achieved with a small thickness removed of ∼70 µm through a combination of overpotential and conventional electrochemical polishing. Interestingly, micro-lattices polished with this approach nearly doubled the specific compressive plateau stress and energy absorption over as-printed lattices. Moreover, the success with 316L stainless steel, 4130 steel and AlSi10Mg, indicates the potential of this approach for smoothening other 3D-printed metals.

通过选择性激光熔化制成的金属结构的高粗糙度限制了它们的广泛应用。为了有效地平滑三维（3D）打印的表面，特别是去除粘附的颗粒，开发了一种过电位电化学抛光策略。通过过电势和常规电化学抛光的结合，获得了约0.18 µm的平均表面粗糙度，并去除了约70 µm的小厚度。有趣的是，用这种方法抛光的微晶格比印刷晶格的比压缩高原应力和能量吸收几乎增加了一倍。此外，316L不锈钢，4130钢和AlSi10Mg的成功表明，该方法在平滑其他3D打印金属方面的潜力。