سيدمحمد حسيني

Nickel and copper coatings are two types of widely used metal coatings, but some harsh environments limited their applications. For this reason, reinforcing particles such SiC and TiO2 were added to strengthen the wear properties of these coatings. Among the different coating methods, electrodeposition is a simpler process, less expensive and has a high deposition rate and control. This method is very suitable for making these copper and nickel composite coatings. In this research, pulse reverse current electrodeposition method (PRCED), which leads to better microstructure and mechanical properties, was used to produce Ni-SiC, Ni-TiO2, Cu-SiC and Cu-TiO2 nanocomposite coatings. The quantity of these reinforcing particles was 5 g/l. These coatings were electrodeposited on the carbon steel substrate and the effect of the duty cycle and stirring speed as process parameters, was eva‎luated on properties. Morphology, microstructure, distribution of particles and amount of reinforcing particles in these coatings were investigated using scanning electron microscope (SEM), EDS analysis and Map analysis. The crystallite size of the coating was determined using X-ray diffraction analysis (XRD) and Scherer's relation, and the microhardness and wear resistance of the coatings were measured using the Vickers microhardness tester and the pin-on-disk device, respectively. The Ni-SiC coating made in optimal conditions has the highest microhardness of 342.2 HV (60% increase compared to pure nickel coating), the lowest friction coefficient 0.11 (87% reduction), the lowest wear rate 5 μg/m ( 68% reduction) and the lowest weight loss 1.5 mg (68% reduction). Among copper-based coatings, the Cu-SiC coating made in optimal conditions has a hardness of 130 HV (43% increase compared to pure copper coating), the lowest friction coefficient 0.43 (60% decrease), the lowest wear rate 46 μg/m (39% reduction) and the lowest weight loss 1.5 mg (39% reduction).

آبكاري الكتريكي پالسي معكوس , پوشش كامپوزيتي Ni-SiC , پوشش كامپوزيتي Ni-TiO2 , پوشش كامپوزيتي Cu-SiC , پوشش كامپوزيتي Cu-TiO2 , خواص سايشي پوشش هاي كامپوزيتي

pulse reverse electrodeposition , Ni-SiC Composite Coating , Ni-TiO2 Composite Coating , Cu-SiC Composite Coating , Cu-TiO2 Composite Coating , Wear Properties of Composite Coatings

Seyed Mohammad Hosseini

Saeed Rastegari