COATING THICKNESS ANALYSIS OF DEPOSITED FeCrAl SUBSTRATE BY γ-AL2O3 THROUGH NiO-ELECTROPLATING (original) (raw)
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International Journal of Advanced Technology in Mechanical, Mechatronics and Materials
The most commonly used method for protecting atmospherically exposed steel against corrosion, is the application of protective organic coating systems. It is widely recognized that the stability of the coating-substrate interface is related to the interfacial adhesion forces and electrochemical properties of this region. This study aim to develop fine surface roughness by ultrasonic and electroplating coating methods that applied for FeCrAl catalytic converter. This method consists of thwo methods which are ultrasonic bath that carried out by frequency of 35 kHz and various ultrasonic times of 1, 1.5, 2, 2.5 and 3 hours is imposed and the electroplating was conducted for several variation times of 15, 30, 45, 60 and 75 minutes, current density of 8 A/dm2. The result shows that the surface roughness of UB samples in between 0.11 to 0.21 µm, UBdEL samples of 0.81 to 2.17 µm, UB+EL samples of 0.64 to 1.63 µm and EL samples of 0.69 to 1.11 µm. The finest surface of each techniques are l...
CRYSTALLINITY ANALYSIS OF COMPOSITE COATING ON Al SUBSTRATE BY ELECTROPLATING METHOD
Ni-P-TiO2 composite coatings were prepared on aluminium substrate by TiO2 sol-enhanced electroplating. A systematic crystallinity study has been conducted in order to understand the effect of heat treatment on the substrate coated with TiO2 solution incorporated into the Ni-P matrix. The crystalline structure of the deposit produced by electroplating method was analyzed using X-Ray diffraction techniques. The parameters like grain size, full width half maximum, height of the peak, position of the peak, area, intergral breath and d-spacing are found and analysed the results for the impact of heat treatment on the deposit coated on the substrates.
Surface quality of the Ni-TiO2 composite coatings produced by electroplating
Journal of Mining and Metallurgy, Section B: Metallurgy
Composite nickel coatings on a brass substrate were produced from suspensions consisted of a conventional nickel sulphate bath and fine TiO2 particles (dp < 0.35 ?m). Characterization of coatings surface was performed by using optical and SEM micrographs, by EDS analysis and by determining the surface roughness parameters. Metallographic analysis has also been done in order to get an insight about particles distribution throughout the thickness of the coating layer. Presence of TiO2 particles in electrodeposited metal affected the surface morphology. Particles were embedded as smaller or bigger agglomerates within the coatings, as well as the individual particles. Metallographic analysis showed uniform distribution of particles and their agglomerates within the coating. Surface roughness parameters of the composites have had up to 35 times higher values than the ones of the pure nickel coatings. Roughness maxima appeared at the concentration of particles between 10 and 20 g dm-3....
Nickel coatings onto brass substrate were produced from conventional suspensions consisted from a conventional nickel sulphate bath and fine TiO magnetic stirrer. Composite coatings were obtained at different current densities and different concentrations of particles in suspensions for a constant process time and constant temperature. Composite coatings were characteri as well as by determining surface roughness parameters. Metallographic analysis has also been done. Coatings obtained from the pure electrolyte under the same other experimental conditions served as an standard for comparison. It was found that the presence of TiO into deposited metal, changing physical characteristics of produced composite. Particles were embedded as smaller or bigger density and particles concentration in electrolyte both determine the amount of embedded particles into the coating thus affecting the surface quality. Certain irregularities appear on the surface in the form of whiskers and nodules at...