TAILIEUCHUNG - Magnesium and ITS Alloys

Magnesium, with a specific gravity of only , is the lowest-density metal available for engineering use. It is produced either by electrolytic reduction of MgCl2 or by chemical reduction of MgO by Si in the form of ferrosilicon. MgCl2 is obtained from seawater, brine deposits, or salt lakes. | CHAPTER 7_ MAGNESIUM AND ITS ALLOYS Robert S. Busk Hilton Head South Carolina INTRODUCTION 109 FABRICATION 110 110 Machining USES 109 Joining 110 Nonstructural Applications 109 Forming 112 Structural Applications 109 CORRROSION AND FINISHING 113 ALLOYS AND PROPERTIES 110 Chemical-Conversion Mechanical Properties of Coatings 113 Castings 110 Anodic Coatings 113 Mechanical Properties of Pointing 113 Wrought Products 110 Electroplating 113 Physical Properties 110 INTRODUCTION Magnesium with a specific gravity of only is the lowest-density metal available for engineering use. It is produced either by electrolytic reduction of MgCl2 or by chemical reduction of MgO by Si in the form of ferrosilicon. MgCl2 is obtained from seawater brine deposits or salt lakes. MgO is obtained principally from seawater or dolomite. Because of the widespread easy availability of magnesium ores . from the ocean the ore supply is in human terms inexhaustible. USES Magnesium is used both as a structural load-bearing material and in applications that exploit its chemical and metallurgical properties. Nonstructural Applications Because of its high place in the electromotive series magnesium is used as a sacrificial anode to protect steel from corrosion some examples are the protection of buried pipelines and the prolongation of the life of household hot-water tanks. Alloys used for this purpose are produced by permanent-mold castings and by extrusion. Magnesium in powder form is added to gray cast iron to produce ductile or nodular iron an alloy that has many of the producibility advantages of cast iron but is ductile and strong. A significant use for magnesium powder is its addition to the iron tapped from blast furnaces to remove sulfur prior to converting to steel thereby increasing the efficiency of the blast furnace and improving the toughness of the steel.

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