Abstract
The paper deals with the fabrication of the surface layer enriched with Zn on AlSi17 aluminium alloy to modify the microstructure and surface properties of the alloy. The continuous surface layer was fabricated on the AlSi17 substrate by the hot-dip galvanizing of AlSi17 for 15min in a Zn bath heated to 450°C. The thickness of the layer was about 100 μm. The layer was characterised by a multi-component microstructure containing the regions of a solid solution of Al in Zn and dendrites of a eutectoid composed of a solid solution of Al in Zn and a solid solution of Zn in Al. In the layer, fine particles of Si with a regular shape were distributed. The results indicated that these Si particles formed by the action of Zn on the eutectic Si precipitations in the AlSi17 substrate. In the microstructure, large primary Si crystals and multi-phase precipitations, originating from the substrate, were also observed. The surface layer had much higher microhardness than the AlSi17 substrate. The results showed that hot-dip galvanizing can be used to modify the microstructure and properties of the surface layer of AlSi17. The study indicates the possibility of conducting further research on the fabrication of joints between AlSi17 and other metallic materials using a Zn interlayer fabricated by hot-dip galvanizing.
Highlights
Aluminium cast alloys are used in many fields of the industry due to their low density, combined with favourable casting and mechanical properties
The vast majority of aluminium alloys are characterised by good corrosion resistance in the natural atmosphere, sea water and many other chemical compounds [1, 2]
The layers enriched with zinc on the surface of the aluminium alloys are fabricated to improve the properties of the joints between them and other metallic materials
Summary
Aluminium cast alloys are used in many fields of the industry due to their low density, combined with favourable casting and mechanical properties. The good corrosion resistance is a result of the presence of a thin layer of aluminium oxide on the surface This layer is a tight barrier preventing the aggressive action of the atmosphere on the metal. The layers enriched with zinc on the surface of the aluminium alloys are fabricated to improve the properties of the joints between them and other metallic materials. The literature data include the studies on the effect of a Zn interlayer on the microstructure and properties of pure Al or Al alloy combined with other metals such https://journals.agh.edu.pl/jcme as Mg [3,4,5,6,7,8] or Cu [9], fabricated by brazing [3], friction stir welding [4], diffusion bonding [5], welding [6, 7], compound casting [8] or ultrasonic welding [9]. Some methods allow the application of Zn between Al alloy and other metal during joining process [6, 7, 9]
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