Investigation of Tribological Behavior of Ceramic–Graphene Composite Coating Produced by Plasma Electrolytic Oxidation

• Published in: Transactions of the Indian Institute of Metals Vol. 71; no. 7; pp. 1643 - 1652
• Main Authors: Nasiri Vatan, H., Adabi, M.
• Format: Journal Article
• Language: English
• Published: New Delhi Springer India 01.07.2018; Springer Nature B.V
• Subjects: Ceramic coatings; Ceramics; Chemistry and Materials Science; Coefficient of friction; Corrosion and Coatings; Electrolytes; Graphene; Magnesium base alloys; Magnesium phosphate; Materials Science; Metallic Materials; Oxidation; Porosity; Scanning electron microscopy; Technical Paper; Tribology; X ray spectrometers; X-ray diffraction; Wear resistance; Mg alloy; Plasma electrolytic oxidation; Graphene
• ISSN: 0972-2815; 0975-1645
• DOI: 10.1007/s12666-018-1300-5

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 (PO 4 ) 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.