Document Type : Original Research Article
Department of Metallurgy and Materials Engineering, Karaj Branch, Islamic Azad University, Karaj, Alborz, Iran
School of Metallurgy and Materials, College of Engineering, University of Tehran, Tehran, Tehran, Iran
In this study, pure nickel was deposited on AA2024 aluminum via pulsed electrodeposition using two duty cycles (25 % and 50 %) at two different frequencies (50 and 100 Hz). The coated specimens were then heat-treated in an argon atmosphere at 500 °C for one hour. The treated specimens were characterized using Optical Microscope (OM), Scanning Electron Microscope (SEM) equipped with energy dispersive spectrometer (EDS), and X-Ray Diffraction (XRD) analysis. According to the results, the coatings were thickened upon increasing the duty cycle and frequency. Heat treatment of the nickel-coated specimen under the duty cycle of 25 % and frequency of 50 Hz experienced formation of Al3Ni intermetallic compound at the interface of the nickel coating and aluminum-based substrate. Heat treatment adversely affected the corrosion resistance of the nickel-coated specimens. Nevertheless, the specimens with Al3Ni intermetallic compound at their interface demonstrated better corrosion resistance among heat-treated materials.