Abstract
Abstract Alloys of magnesium have been the most preferred materials in the manufacturing industry due to many attractive properties, especially high strength to weight ratio. However, outdoor applications of this metal is very scarce because of their poor wear and corrosion resistance. This work was attempted to understand the changes in the microstructure, microhardness and the wear behavior of the composite coating effected by the direct and pulsed current. Titanium carbide nano particles along with nickel metal matrix were coated on AZ80A magnesium alloy by electro codeposition technique. Special pretreatment procedures and interlayer coatings were done to prevent the metal from being corroded during electrodeposition of nickel in watts bath. The microhardness, microstructure and composition of the composite coatings were analyzed using Vicker’s microhardness tester, SEM and EDS techniques respectively. It was found that the samples coated with pulsed current exhibited more refined grains thereby yielding a compact coating with higher hardness and wear resistance in comparison with the samples coated with direct current
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