Electrodeposition and corrosion behavior of nano-structured Ni-WC and Ni-Co-WC composite coating
By Elkhoshkhany, N.; Hafnway, Ahmed; Khaled, Alaa
Published in Journal of Alloys and Compounds
NULL
2017
Abstract
Abstract Composite coating of metallic-ceramics tungsten carbide (WC) in nickel matrix has been achieved by direct current (DC) electrodeposition using watt's bath solution on stainless steel substrate. The deposition parameters such as current density, bath temperature, and stirring rate were maintained at constant levels for all the coating configurations. The surface morphologies, microstructure, and chemical composition of the composite coating were studied using scanning electron microscope (SEM), X-ray diffraction (XRD), and energy dispersive analyzer x-ray system (EDX), respectively. The surface morphology and microstructure analysis showed that the composite coatings form cauliflower-like grain colonies, grain size was calculated from Scherrer equation it was less than 60 nm for all composite coating. Micro hardness of composite coating was increased by increasing {WC} load in solution and decreasing grain size. The electrochemical corrosion behavior of composite coating was evaluated by potentiodynamic polarization measurements and electrochemical impedance spectroscopy (EIS) in aerated 0.5 mol/l {H2SO4} at room temperature, showing passivation behavior of all composite coating, good protection of Ni-8g/l {WC} on stainless steel substrate.
Microsoft is Ending Support for Windows 7
Microsoft will discontinue support for Windows 7 on January 14, 2020 which means Gamry will also be discontinuing support for Windows 7. If you are upgrading to Windows 10, like many companies and institutions, you need to be running Version 7 of our s oftware . Please note that only USB and Ethernet-based instruments can run in Version 7. Eligible users can download the latest version of our software through our online Client Portal .
If you haven't already registered your instrument, you can do so through the Client Portal .
Please email Technical Support if you have any questions regarding this transition. Please be sure to include your instrument model and serial number when contacting us.