Abstract The aim of this investigations was to increase the wear resistance and the corrosion resistance of magnesium alloys. It can be noticed, that the coating of magnesium alloys is practicable with PTA welding and laser welding. The quality of coatings depends on the composition of the strap material, on the composition of the coating material (matrix material, carbides) and the welding parameters. The magnesium alloys AM50 and AZ31 are suitable for coating. But microporosity is not available. The best results were obtained with a coating matrix material of AlSi12 and addition of B4C. This coatings have a fine and homogeneous structure. Paper text in German.

Abstract In this paper results of the alloying of magnesium materials by a combination of thermal spraying and a subsequent electron beam surface technology are presented. The objective is to improve the wear resistance of magnesium alloys. Aluminium and copper were chosen as the alloying material. These metals can form hard intermetallic compounds with magnesium, such as MgAl2 or Mg2Cu. The vacuum plasma spraying is well suited for the deposition of these additives because of the prevention of their oxidation. Besides, the EB technology take place under vacuum conditions, and the reactions between magnesium and oxygen are prevented. Paper text in German.

Abstract This paper reviews the results of thermal spraying on the magnesium alloy AZ 91. By plasma, arc and HVOF spraying various metal based alloys were used as coating materials. The layers were investigated with regard to microstructure, bonding and corrosion resistance. Paper text in German.

Abstract Magnesium alloys are widely used as lightweight metals in cars and trucks, but they require special surface treatments to offset corrosion and wear limitations. One such treatment, electron beam remelting, is the focus of this present work. As described in the paper, copper and nickel powders were plasma sprayed onto magnesium in a vacuum chamber, then heated to melting temperatures with a swept electron beam. Copper and nickel were chosen because they form hard intermetallic compounds when melted with magnesium. The structure and properties of the remelted Cu- or Ni-alloyed surface layer were found to be dependent on the properties of the plasma sprayed coating and the parameters of the e-beam treatment. In the course of the investigation, the coatings were assessed based on their microstructure, the thickness of the remelting zone, occurring phases, and the determination of hardness and abrasive wear resistance.