Effects of corrosion and wear on cermet based coatings

Mohd Rabani, Nur Amira (2017) Effects of corrosion and wear on cermet based coatings. Masters thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

Cermet based coating is a combination of ceramic materials and metal which has an excellent combination of hardness and toughness characteristics. The implementation of coatings has been largely used for application on steel in order to control and minimize the corrosion and wear effect of the materials. This study compares the corrosion and wear resistance of cermet based coatings which consist of tungsten carbide-17cobalt (WC1), tungsten carbide-9nickel (WC2), electrodeposited Ni (N1), and electrodeposited nickel-silicon carbide, (N2) coatings. They were produced by two different methods of high velocity oxygen fuel (HVOF) spraying process and electrodeposition methods onto AISI 1018 carbon steel plates. The microstructures of the coating were examined by optical microscope (OM), scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). The hardness was measured by using Vickers microhardness tester. Electrochemical polarization tests were performed in 0.5 M H2SO4 aqueous solution with pH value of 1, and 30% by weight of bentonite solution with pH value of 9 for the corrosion test. There were two types of abrasive wear test covered in this study which was pin-on-disk and three-body wear test with two types of slurries which were silicon carbide slurries and bentonite slurries. Both of HVOF coatings show an average of 10% higher in wear resistance compared to electrodeposited coatings. However, N2 coating and WC2 show the highest corrosion resistance in acidic and bentonite solution respectively compared to other coatings. While the hardness for both HVOF coatings were extremely high which approximately 1500 HV compared to the electrodeposited coatings which only 350 HV in average. The hardness, corrosion and wear resistance of the coatings are depend on the coatings deposition methods, conditions of the environment such as pH value of the solution and the abrasive characteristics, grain size of the particles used, as well as composition of the coatings.

Item Type:Thesis (Masters)
Subjects:T Technology > TA Engineering (General). Civil engineering (General) > TA401-492 Materials of engineering and construction. Mechanics of materials
ID Code:9983
Deposited By:Mr. Mohammad Shaifulrip Ithnin
Deposited On:02 May 2018 16:57
Last Modified:02 May 2018 16:57

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