‎Deposition of Ni-tungsten carbide nanocomposite coating by TIG ‎welding: Characterization and control of microstructure and wear/corrosion responses‎. Issue 18 (15th December 2018)

• Record Type: Journal Article
• Authors: Sabzi, Masoud; Dezfuli, Saeid Mersagh; Far, Sadegh Moeini
• Is Part Of: Ceramics international. Volume 44:Issue 18(2018)
• Page Start: 22816
• Page End: 22829
• Publication Date: 2018-12-15
• Subjects: Tungsten carbide nanoparticles -- Ni-tungsten carbide nanocomposite coating -- Tribological properties -- Surface alloying -- Microstructural characterization; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2018.09.073
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: In this study, the effect of the amount of tungsten carbide nanoparticles on the wear and corrosion properties of Ni-tungsten carbide nanocomposite coating which is deposited on steel St37 by Tungsten Inert Gas (TIG) welding was evaluated. For this purpose, surface alloying was firstly conducted on St37 steel by using TIG process with a current of 150 Amps using pure nickel powder and tungsten carbide reinforcement nanoparticles (in 5, 10, 15 and 20 wt%). Then, Transmission Electron Microscopy (TEM), optical microscope, Field Emission Scanning Electron Microscopy (FE-SEM), Energy Dispersive Spectroscopy (EDS), X-ray Diffraction (XRD), microhardness test by Vickers method, abrasion test by sweep method, and electrochemical tests (potentiodynamic polarization and electrochemical impedance spectroscopy) were used in order to characterize the microstructure and tribological properties of the deposited layers. Microstructural observations showed that the deposited Ni-tungsten carbide nanocomposite coating have a dendritic microstructure with a uniform distribution of tungsten carbide nanoparticles, which reduced the dendritic size by increasing the amount of tungsten carbide nanoparticles. The results of this study showed that by increasing the amount of tungsten carbide nanoparticles in the Ni- tungsten carbide nanocomposite coating, the hardness (from the coating surface to the interface of coating/substrate) and wear resistance increased sharply, but the corrosion resistance decreased. Also, the evaluation of the wear mechanism showed that by increasing the amount of tungsten carbide nanoparticles in Ni-tungsten carbide nanocomposite coatings, the wear mechanism in this coating changed from complex abrasive-sheet like to complex adhesive-oxidation.