Abstract
In present work the Cr3C2–NiCr coating was deposited on magnesium alloy substrate with high velocity oxygen fuel (HVOF) spraying. The microstructure of the samples has been characterized by means of electron microscopy, SEM and phase composition analysis carried out. The porosity of coatings has been also estimated. Finally, tests of selected mechanical properties, such as instrumented indentation, abrasive erosion have been performed. The results of the investigations confirmed that dense, homogeneous and well-adhered Cr3C2–NiCr cermet coating is possible to obtain onto the magnesium AZ31 alloy substrate. Moreover, the coatings exhibit high resistance to erosion.
Highlights
For several years, magnesium alloys have been the subject of research in numerous scientific and research centers, as well as among industry producers, including automotive, machine construction, shipbuilding, aviation, chemical, energy, electronic and textile industries
AZ31 magnesium alloy was selected as a substrate material, with the chemical composition: Mn—0.17, Zn—1; Al—3, Ca—0.04, Cu—0.05 and Mg—balance, with 5 mm in the thickness (Institute of Non-Ferrous Metals in Gliwice, Skawina, Poland) [26]
SEM micrographs of the coating have indicated unmelted carbide particles in the metallic (Ni–Cr) matrix
Summary
Magnesium alloys have been the subject of research in numerous scientific and research centers, as well as among industry producers, including automotive, machine construction, shipbuilding, aviation, chemical, energy, electronic and textile industries. Low resistance to corrosion, erosion and abrasive wear can adversely affect and limit their widespread use [1,2,3,4,5,6] The solution of this problem is to create protective layers, among others coatings applied by thermal spraying methods, which are used to extend the durability and life of machine parts, both new and remanufactured. The HVOF method allows the production of coatings with special properties, among others: low oxidation, very low porosity and high adhesion strength Important advantage of this method is manufacturing coatings, which exhibit high abrasion resistance, protection against high temperature, erosion and corrosion
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