Surface modification of 2014 aluminium alloy–Al2O3 particles composites by nickel electrochemical deposition (original) (raw)
Related papers
Preparation and Study on Nickel Coated Aluminium through Electroless Deposition Technique
2016
In this study we made an attempt to prepare nickel (Ni) coated aluminium (Al)via electroless deposition technique for the formation of a thin metallic nickel film coating on pure sintered aluminium substrate which was developed by powder metallurgy route.The metal film of nickel was deposited on the metal surface of aluminium from an aqueous electrolytic solution of nickel chloride as a source ofnickel. This electroless deposition process involves without additional external electrode or any electric current passingthrough it.The surface structure of sintered aluminium is changed as a consequence of several interactions between sintered aluminium and aqueous electrolytic solution of nickel chloride carried on room temperature. In this experiment the influence of process parameter like temperature was also observed. The prepared nickel coated aluminium samplewas analyzed for their phases by XRD analysis. Changes of surface morphology after electroless deposition on aluminium substrat...
Surface Modification of Al Alloy 2014 by Electrochemical Deposition of Ni
The surface of Aluminum alloy AA 2014 was modified by electrochemical deposition of Ni and its effect on corrosion performance was evaluated. Standard Watt's bath with varying potential, current and time was employed for deposition. The Ni-coated samples were heat treated to improve coating characteristics. Corrosion behavior was studied by electrochemical testing and microstructural characterization was performed using scanning electron microscopy. Microhardness was also undertaken. Experimental results indicate that electrochemical deposition combined with heat treatment can be used to improve the surface properties of Al alloys.
Reaction synthesis of Ni-Al-based particle composite coatings
Metallurgical and Materials Transactions A, 2001
Electrodeposited metal matrbdmetal particle composite (EMMC) coatings were produced with a nickel matrix and aluminum particles. By optimizing the process parameters, coatings were deposited with 20 volume percent aluminum particles. Coating morphology and composition were characterized using light optical microscopy (LOM), scanning electron microscopy (SEMj, and electron probe microanalysis @?MA). Differential thermal analysis (DTA) was employed to study reactive phase formation. The effect of heat treatment on coating phase formation was studied in the temperature range 415 to 1000"C. Long-time exposure at low temperature results in the formation of several intermetallic phases at the Ni matrix/Al. particle interfaces and concentrically around the original Al particles. Upon heating to the 500-600"C range, the aluminum particles react with the nickel matrix to form NiAl islands within the Ni matrix. When exposed to higher temperatures (6OO-1OOO"C), diffusional reaction between NiAl and nickel produces (y')Ni3Al. The final equilibrium microstructure consists of blocks of (y')Ni3Al in a y(Ni) solid solution matrix, with small pores also present. Pore formation is explained based on local density changes during intermetallic phase formation and microstructural development is discussed with reference to reaction synthesis of bulk nickel aluminizes.
Wear, 2009
In the present work, Ni/Al 2 O 3 metal matrix composite (MMC) coatings were prepared from a modified Watt's type electrolyte containing nano-␣-Al 2 O 3 particles by direct current (DC) plating method to increase the surface hardness and wear resistance of the electrodeposited Ni. For these purposes, particle concentration in electrolyte, the effect of surfactant concentration, current density, and bath pH, etc. were investigated for optimization to obtain high quality coatings. Al 2 O 3 nano-powders with average particle size of 80 nm were co-deposited with nickel matrix on the steel substrates. The depositions were controlled to obtain specific thickness (between 50 and 200 m) and particle volume fraction in the matrix (between 0.03 and 0.12). The characterization of the coatings was investigated by scanning electron microscopy (SEM) and X-ray diffraction (XRD) facilities. The hardness of the resultant coatings was also measured and found to be 280-641 Hv depending on the particle volume in the Ni matrix. The effects of the surfactant on the zeta potential, co-deposition, and distribution of Al 2 O 3 particles in nickel matrix, and tribological properties of composite coatings were investigated. The results showed that the wear resistance of the nano-composites was approximately 2-3.5 times increased compared with unreinforced Ni deposited material.
Structure Characterization of Ni/Al2O3 Composite Coatings Prepared by Electrodeposition
Solid State Phenomena, 2010
In the present study, the electrodeposition of composites consisted of metal matrix (nickel) and inert particles (hard nano-sized Al 2 O 3 oxide) has been carried out in a Watt's type bath of pH 4, at room temperature in a system with the steel rotating disk electrode. The influence of dispersed Al 2 O 3 powder on structure characteristics (morphology, phase composition, texture, residual stresses) of Ni/Al 2 O 3 coatings has been investigated. The crystallographic texture of Ni and Ni/Al 2 O 3 coatings deposited on the steel substrates was analyzed by XRD technique based on the back-reflection pole figures. The "sin 2 ψ" X-ray diffraction method was used to determine the residual stress as a function of X-ray penetration depth. The influence of Al 2 O 3 particles on the value of the Ni coating microhardness was also analyzed.
Surface Engineering, 2005
Nickel was deposited galvanostatically at 0 . 23, 0 . 77, 1 . 55, 3 . 1 and 5 . 4 A dm -2 current densities at room temperature. An XRD technique was employed for evaluating the grain size and preferred orientation of the nickel deposit. The cross-sections of the nickel deposits were subjected to microhardness and microstructure analysis. Nanosize alumina was prepared by a solution combustion technique, and the powder was characterised by XRD and particle size analysis. The particle size of Al 2 O 3 powder synthesised by the combustion process was 30 nm. XRD confirmed the presence of pure a-Al 2 O 3 . Combustion synthesised alumina (CSA) powder was codeposited in the nickel matrix at various current densities, as in the case of nickel. Similarly, commercially available 0 . 05 mm Al 2 O 3 containing a mixture of a and c phases was codeposited in nickel matrix. The Ni-Al 2 O 3 nanocomposite coatings were characterised by XRD, microhardness measurement and image analysis. The results obtained with nickel and Ni-Al 2 O 3 composite coatings are compared.
Structure Characterization of Ni/Al 2 O 3 Composite Coatings Prepared by Electrodeposition
Solid State Phenomena, 2010
In the present study, the electrodeposition of composites consisted of metal matrix (nickel) and inert particles (hard nano-sized Al 2 O 3 oxide) has been carried out in a Watt's type bath of pH 4, at room temperature in a system with the steel rotating disk electrode. The influence of dispersed Al 2 O 3 powder on structure characteristics (morphology, phase composition, texture, residual stresses) of Ni/Al 2 O 3 coatings has been investigated. The crystallographic texture of Ni and Ni/Al 2 O 3 coatings deposited on the steel substrates was analyzed by XRD technique based on the back-reflection pole figures. The "sin 2 ψ" X-ray diffraction method was used to determine the residual stress as a function of X-ray penetration depth. The influence of Al 2 O 3 particles on the value of the Ni coating microhardness was also analyzed.
Archives of Metallurgy and Materials, 2014
In this study, the effect of zinc interlayer on the adhesion of nickel coatings reinforced with micrometric Al2O3 particles was examined. Nickel coating was applied by electroplating on EN AW - 5754 aluminium alloy using Watts bath at a concentration of 150 g/l of nickel sulphate with the addition of 50 g/l of Al2O3. The influence of zinc intermediate coating deposited in single, double and triple layers on the adhesion of nickel coating to aluminium substrate was also studied. The adhesion was measured by the thermal shock technique in accordance with PN-EN ISO 2819. The microhardness of nickel coating before and after heat treatment was additionally tested. It was observed that the number of zinc interlayers applied does not significantly affect the adhesion of nickel which is determined by thermal shock. No defect that occurs after the test, such as delamination, blistering or peeling of the coating was registered. Microhardness of the nickel coatings depends on the heat treatmen...
Microstructure and surface mechanical properties of electrodeposited Ni coating on Al 2014 alloy
The surface of Al 2014 was modified by electrochemical deposition of Ni with an aim to improve the surface mechanical properties of the alloy. The deposition was performed at various values of DC current, potential and time using standard Watt's bath. The samples were heat treated to improve the adhesion and hardness of Ni coatings. Material characterization was performed using scanning electron microscopy coupled with energy dispersive X-ray spectroscopy, atomic force microscopy and X-ray diffraction. Microhardness, nanohardness, microscratch and coefficient of friction measurements were undertaken to determine the surface mechanical properties of the electrodeposited Ni coating. Experimental results indicate that electrochemical deposition combined with heat treatment can be used to improve the surface properties of Al alloys.
Corrosion resistance of electrodeposited Ni–Al composite coatings on the aluminum substrate
Materials & Design, 2011
The user has requested enhancement of the downloaded file. All in-text references underlined in blue are added to the original document and are linked to publications on ResearchGate, letting you access and read them immediately. This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues.