The Preparation Method of Aluminum-magnesium Alloys

Abstract

In this paper, the preparation methods of aluminum-magnesium alloys are reviewed. The three methods of preparation of aluminum-magnesium alloys are introduced: the mixing method, mechanical alloying method, electrodeposition method. And the advantages and disadvantages and characteristics of three methods are expounded. Nowdays, the mixing method and mechanical alloying method are relatively mature. But heat consumption is great. Compared with mechanical alloying method, the electrodeposition method requires simple equipment and it's easy to operate. More uniform grain can be obtained. It has attracted general concern to prepare Al-Mg alloys by the electrodeposition method. In this paper aluminum-magnesium alloys are prepared by direct current electrodeposition and pulse electrodeposition in AlCl3-LiAlH4-benzene-tetrahydrofuran (THF) system. The deposit morphology and chemical compositions of coatings by direct current and pulse electrodeposition are compared. The effects of the pulse duration ratio on coatings are studied. The coatings obtained by pulse electrodeposition are greater than the coatings obtained by direct current electrodeposition under the same electroplating conditions. The grain sizes of the coatings obtained by pulse electrodeposition are smaller, and the magnesium contents of the coatings are higher.