Journal
TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
Volume 71, Issue 7, Pages 1643-1652Publisher
SPRINGER INDIA
DOI: 10.1007/s12666-018-1300-5
Keywords
Mg alloy; Plasma electrolytic oxidation; Graphene; Wear resistance
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Plasma electrolyte oxidation coatings were formed on AZ31 magnesium alloy in the phosphate electrolyte containing 0 and 5 g L-1 graphenes at different process times. The composition and microstructure of the coatings were analyzed by scanning electron microscope (SEM) equipped with energy dispersive X-ray spectrometer and X-ray diffraction (XRD). The SEM images showed that by increasing the coating time, the number of coating pores decreased whereas the diameter of coating pores increased. Furthermore, the diameter and number of pores related to ceramic-graphene composite coatings were lower than ceramic ones. XRD analysis indicated that major constituents of coatings were MgO and Mg-3(PO4)(2). The pin-on-disk sliding tests revealed that the wear loss and coefficient of friction of ceramic-graphene composite coatings were lower than simple ones.
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