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High-quality surface smoothening of laser powder bed fusion additive manufacturing AlSi10Mg via intermittent electrochemical polishing
Surface & Coatings Technology ( IF 5.3 ) Pub Date : 2022-06-11 , DOI: 10.1016/j.surfcoat.2022.128608
Han Liu , Minheng Ye , Zuoyan Ye , Lili Wang , Guowei Wang , Xianfeng Shen , Ping Xu , Chao Wang

Though the laser powder bed fusion (LPBF) additive manufacturing (AM) AlSi10Mg alloy (LPBF AlSi10Mg) has been utilized for weldability and fatigue resistant property, its high surface roughness limits widespread application. Here, we report the surface roughness reduction of the LPBF AlSi10Mg via electrochemical polishing (ECP). A novel viscous layer formation mechanism is found on LPBF AlSi10Mg surface during the ECP process. An environmentally friendly NaOH based electrolyte was utilized to passivate the LPBF AlSi10Mg surface, resulting in successful ECP of the LPBF AlSi10Mg. Furthermore, the Si phase and its reaction products with electrolyte formed on the polishing surface were found to be a barrier for improving the surface quality of LPBF AlSi10Mg. Therefore, an intermittent removal of the polishing products on AlSi10Mg further improves the polishing effect, i.e., an intermittent electrochemical polishing (IECP) method was utilized to improve the polishing quality of LPBF AlSi10Mg. The surface roughness (Sa) is reduced by 87.7 %, and the corrosion current density (icorr) is decreased by 17 folds. The significantly improved polishing effect of IECP is dominated by removing ECP products constantly to enhance dissolution of Al element in AlSi10Mg and fluent dispersion of electrolyte and Al3+ in the metal-electrolyte interface.



中文翻译:

通过间歇电化学抛光对激光粉末床熔融增材制造 AlSi10Mg 进行高质量表面平滑处理

虽然激光粉末床熔合 (LPBF)增材制造 (AM) AlSi10Mg 合金 (LPBF AlSi10Mg) 已被用于可焊性和抗疲劳性能,其高表面粗糙度限制了广泛的应用。在这里,我们报告了通过电化学抛光 (ECP) 降低 LPBF AlSi10Mg 的表面粗糙度。在 ECP 过程中,LPBF AlSi10Mg 表面上发现了一种新的粘性层形成机制。使用环保的 NaOH 基电解质对 LPBF AlSi10Mg 表面进行钝化,从而成功实现了 LPBF AlSi10Mg 的 ECP。此外,Si相及其与抛光表面上形成的电解质的反应产物被发现是提高LPBF AlSi10Mg表面质量的障碍。因此,间歇性去除 AlSi10Mg 上的抛光产物可进一步提高抛光效果,即 采用间歇电化学抛光 (IECP) 方法提高 LPBF AlSi10Mg 的抛光质量。表面粗糙度(Sa)降低了 87.7%,腐蚀电流密度(icorr ) 减少了 17 倍。IECP 抛光效果的显着改善主要是通过不断去除 ECP 产物以增强 Al 元素在 AlSi10Mg 中的溶解以及电解液和 Al 3+在金属-电解液界面的流动分散。

更新日期:2022-06-16
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