Magnesium Alloys and Laser Cladding
Magnesium alloys are good structural materials because of their low density, which results in very high specific mechanical properties, ease of machining, and low cost. The primary constraints of magnesium alloys are their low surface characteristics and low wear and corrosion resistance. One strategy for overcoming these constraints is to use laser cladding techniques to create protective surface coatings.
The primary advantages of laser cladding over traditional approaches include reduced substrate thermal distortion, improved surface attributes with low dilution, and improved surface quality. To obtain coatings with good mechanical properties, it is required to choose the suitable process parameters (laser power, powder feed, scanning speed, and properties of the substrate and the powder)
Laser fabrication methods are divided into three types: laser cladding, laser alloying, and laser glazing. Laser cladding is a coating manufacturing technology that uses a laser as an energy material to generate low porosity and improved coatings on metals. The laser alloying technology simultaneously simulates the feeding material and the substrate, resulting in a homogeneous alloyed metal. Laser glazing is melting only a small portion of the substrate and rapid cooling, resulting in amorphous crystals.
This study examines the current processes in magnesium laser cladding and investigates the effect of the most critical fabrication parameters on the interaction of various coating-substrate systems employed on mechanical properties and corrosion resistance.