The limited choice of metallic alloys suitable for additive manufacturing restricts the possibilities for new design strategies and improved materials performance in demanding applications. We applied plasma electrolytic oxidation to improve the performance of 3D printed and cast AlSi12 alloy substrates. A silicate alkaline electrolyte and a combined current mode were used. Coatings were characterised by XRD and SEM analyses and microhardness tests. Produced coatings feature microhardness level of 300–600 HV_0.2, which is 3–5 times higher than the original alloy, extending the mechanical properties of 3D printed articles. The features in electrochemical behaviour of AlSi alloys with the same elemental composition, but different microstructural state, are explained by means of individual electrochemical responses of aluminium and silicon phases.

适用于增材制造的金属合金的有限选择限制了在苛刻的应用中采用新设计策略和改善材料性能的可能性。我们应用等离子体电解氧化来改善3D打印和铸造AlSi12合金基板的性能。使用硅酸盐碱性电解质和组合电流模式。通过XRD和SEM分析以及显微硬度测试来表征涂层。产生的涂层具有300-600 HV _0.2的显微硬度，是原始合金的3-5倍，从而扩展了3D打印制品的机械性能。Al的电化学行为特征通过铝和硅相的单独电化学响应来解释具有相同元素组成但不同微结构状态的硅合金。