AC plasma electrolytic oxidation of additively manufactured and cast AlSi12 alloys

SURFACE & COATINGS TECHNOLOGY

卷:399

Article

Rogov, Aleksey B.^1,2  Lyu, Hulling¹  Matthews, Allan¹  Yerokhin, Aleksey¹ 

[1] Univ Manchester, Dept Mat, Manchester M13 9PL, Lancs, England

[2] Sci & Tech Ctr Pokrytie A, Novosibirsk 630015, Russia

关键词: Additively manufactured aluminium;    AlSi12 alloy;    Plasma electrolytic oxidation;    Alternating current;   

DOI  :  10.1016/j.surfcoat.2020.126116

来源: Elsevier

【 摘 要 】

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 HV0.2, which is 3-5 times higher than the original alloy, extending the mechanical properties of 3D printed articles. The features in electrochemical behaviour of Al-Si alloys with the same elemental composition, but different microstructural state, are explained by means of individual electrochemical responses of aluminium and silicon phases.

【 授权许可】

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