Development of High Corrosion- and Wear-Resistant Al-Si Alloy Coating on AZ80 Mg Alloy by Hot Extrusion
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JMEPEG https://doi.org/10.1007/s11665-020-05134-9
Development of High Corrosion- and Wear-Resistant Al-Si Alloy Coating on AZ80 Mg Alloy by Hot Extrusion Toko Tokunaga
, Kazushi Sotomoto, Munekazu Ohno, and Kiyotaka Matsuura
(Submitted February 2, 2020; in revised form July 30, 2020) Mg alloys have been known as the lightest metal materials. However, their practical use is strictly limited due to their poor corrosion and wear resistances. To improve those resistances simultaneously, the present authors have fabricated an Al-Si alloy coating on a Mg alloy substrate by hot extrusion. The Al-Si alloy for coating material was prepared by powder metallurgy and casting processes. An AZ80 Mg alloy billet, a compacted Al-Si alloy plate or a cast Al-Si alloy plate, a die and rams were put in bottom of an extrusion container, and the Mg alloy and the Al-Si alloy were indirectly extruded together. By the hot extrusion, the Mg alloy was successfully coated with the Al-Si alloys prepared in both the powder metallurgy and the casting. The Al-Si alloy-coated Mg alloys showed a high corrosion resistance in a 1.0 mol/L HCl aqueous solution. Also, the wear resistance of the Mg alloy was significantly improved by the Al-Si alloy coating layers. The highest wear resistance was obtained with a cast Al-20 vol.%Si alloy coating layer. The coating improved the wear resistance by 50% compared with the AZ80 Mg alloy. Keywords
Al-Si alloy, coating, corrosion resistance, Mg alloy, wear resistance
1. Introduction Mg alloys are widely known as the lightest in practical metal materials, and they have been mainly used as structural materials such as electric device components. Recently, to control and mitigate the global warming problem, energy and resource savings have been attempted with fabrication of lightweight vehicles. Therefore, Mg alloys have been applied in automobile and aircraft industries to improve the fuel efficiency and consequently they are considered as one of the most promising materials for solving global warming problems. However, their poor resistances to corrosion and wear limit the practical applications (Ref 1, 2). A number of works have been devoted to improvement of the corrosion resistance of Mg alloys. In particular, many coating techniques have been proposed, e.g. electroplating (Ref 3), micro-arc oxidation (Ref 4), and chemical vapour deposition (Ref 5). Also, since structural materials are generally subjected to tribological motion in many applications, tribological properties of Mg alloys have received increasing interests. In the past decades, there have been many techniques for improving the wear resistance of the Mg alloys, e.g. with fabrication of metal
Toko Tokunaga, Aomori Prefecture Quantum Science Center, 2-190, Omotedate, Obuchi, Rokkasho-mura, Kamikita-gun, Aomori 0393212, Japan; Kazushi Sotomoto, Graduate School of Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo, Hokkaido 060-8628, Japan; and Fujikura Ltd, Sakura, Chiba 285-8550, Japan; and Munekazu Ohno and Kiyotaka Matsuura, Fac
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