title: Electrodeposition and characterization of Ni-ZrO2 nanocomposites by direct and pulse current methods.
abstract: Direct Current (DC) and Pulse current (PC) methods were used to get nanocrystalline Ni-ZrO2 composites from tri-ammonium citrate bath. In the electrocomposite formation, the ZrO2 particles were transported to the surface by mechanical action and got entrapped in the nickel matrix. Incorporation of ZrO2 in the nickel matrix was found to increase with current densities when DC was employed. Beyond 2 A/dm2, their incorporation became saturated when PC was used. PC method offered better electrocomposites than DC method producing finer grains and uniform surface. Scanning electron micrographs (SEM) reveals that smaller grains and uniform distribution of Zirconia particles in the nickel matrix. The increased hardness of Ni-ZrO2 electrocomposite coatings is due to incorporation of ZrO2 particles in the nickel matrix and also changes in grain size. Incorporation of ZrO2 particles in Ni-matrix favoured the enhanced microhardness and corrosion resistance of the deposit.
authors: Advanced Nano Composite Coatings Laboratory, Department of Industrial Chemistry, Alagappa University, Karaikudi 630003, Tamilnadu, India.
authors: K Arunsunai
authors: KA
authors: Kumar
authors: P
authors: P
authors: Mohan
authors: G Paruthimal
authors: GP
authors: Kalaignan
authors: V S
authors: VS
authors: Muralidharan
mesh_terms: D003460:Crystallization / Q000379:methods*; D004595:Electroplating / Q000379:methods*; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D009532:Nickel / Q000737:chemistry*; D010316:Particle Size; D013499:Surface Properties; D015040:Zirconium / Q000737:chemistry*
chemical_list: D046911:Macromolecular Substances; D009532:Nickel; C028007:nickel monoxide; D015040:Zirconium; C028541:zirconium oxide