Kinetic and operational electrolysis parameters determine the polarization characteristics, electrodeposition current efficiency, morphology, chemical composition microstructure of nickel/iron/tungsten alloy deposits. The alloys electrodeposited at a density 50 mAcm-2 to 1000 contain an amorphous phase nanocrystals FCC solid solution iron tungsten in nickel. During annealing temperatures above 500?C, crystallization, crystalline grain growth reduction both internal microstrain minimum...

Nanostructured nickel-iron-tungsten alloy coatings were electrodeposited from an ammonia citrate bath on steel and copper substrates at current densities in the range of 50 to 300 mA cm−2. The contents iron tungsten increase that nickel decreases with increasing deposition density. At below 100 cm−2, smooth shiny no cracks craters are deposited. Higher result matte developing craters. XRD analysis showed contain nanocrystals FCC structured solid solution embedded amorphous matrix. Increasing...

Nanostructured nickel-iron-tungsten alloys were produced by electrodeposition from an ammoniacal citrate bath. The tungsten content of the alloy ranged 0.8 wt.% to 11 wt.%, and crystal grain size FCC phase solid solution iron in nickel was between 14 nm 3.3 nm. amorphous increases with decreasing size. As increases, magnetization, electrical conductivity hardness decrease. Annealing crystallization temperature results structural relaxation during which undergoes short-range ordering...

Cobalt and nickel powders of three different compositions: Ni0.8Co0.2, Ni0.55Co0.45 Ni0.2Co0.8 were obtained by electrodeposition from an ammonium chloride-sulphate solution. It was shown that the microstructure morphology depended on deposition current density as well bath composition. Amorphous powder Ni0.8Co0.2 at higher than 200 mA cm-2, but nanocrystalline having same composition densities lower mAcm-2. The with Ni contents (0.55 0.2) a ranging 40 cm-2 to 450 solid solutions two phases,...

Ni96.7Mo3.3 powder was electrochemically obtained. An X-ray diffraction analysis determined that the consisted of a 20% amorphous and 80% crystalline phase. The phase nanocrystalline solid nickel molybdenum solution with face-centred cubic (FCC) lattice high density chaotically distributed dislocations microstrain value. scanning electronic microscopy (SEM) showed two particle structures were formed: larger cauliflower-like particles smaller dendriteshaped ones. thermal stability alloy...

Chlorine is used worldwide for water disinfection purposes. However, due to its toxicity the EU has imposed a set of standards that must be applied when transporting and storing chlorine. In Serbia, numerous studies have been conducted attempting develop technology generation active chlorine disinfectant but with non-toxic aqueous solution sodium chloride as raw material. This study provides an overview titanium anodes activated by thermally obtained solid ruthenium oxide development. It...

A nanostructured Ni-11.3Fe-1.4W alloy deposit was obtained from an ammonium citrate bath at a current density of 600 mAcm-2. XRD analysis shows that the contains amorphous matrix having embedded nanocrystals FCC phase solid solution Fe and W in Ni with average crystal grain size 8.8 nm. The has high internal microstrain value minimum chaotically distributed dislocations. effect milling annealing on electrical magnetic properties studied. Structural changes take place during both milling....

In this study it was investigated influence of temperature and frequency on permeability, coercivity power loses Fe81B13Si4C2 amorphous alloy. Magnetic permeability measurements performed in nonisothermal isothermal conditions confirmed that efficient structural relaxation occurred at 663 K. This process two steps, the first one is kinetic second diffuse. Activation energies these processes are: Ea1 = 52.02 kJ/mol for Ea2 106.9 It shown after annealing K decrease about 30% therefore...

A catalytic coating composed of a mixture RuO 2 and Pt nanocrystals was prepared by thermal procedure on titanium substrate used for the electrochemical oxidation methanol.The adsorption intermediate CO, formed methanol nanocrystals, depended potential composition.An increase in content decreased rate dehydrogenation increased strongly bound CO ad .This caused decrease maximum coverage with shift rapid linear drop to more negative potentials.

A mathematical model has been set up for current efficiency in a chlorate cell acting as an ideal electrochemical tubular reactor with linear increase hypochlorite concentration from the entrance to exit. Good agreement was found between results on experimentally obtained under simulated industrial production conditions and theoretical values provided by model.

Nickel and molybdenum alloy powder was electrodeposited on a titanium cathode from NiSO4?7H2O (NH4)6 Mo7O24?4H2O ammonium solution. The desired chemical composition, structure, size shape of particles in the samples were achieved by an appropriate choice electrolysis parameters (current density, composition temperature solution, material duration). Metal coatings form current density range 15 mA cm-2<j<30 cm-2. If is greater than 40mA cm-2 then powders form. depends electrodeposition....

The Ni92.8Mo7.2 alloy powder was obtained by electrochemical codeposition from an ammonium solution of NiSO4 and (NH4)6 Mo7O24 at j = 100 mA m-2, on a titanium cathode. DSC measurements determination the dependence electrical resistivity temperature did not reveal any changes in structure range 293 to 460 K. Therefore, this range, there no significant change magnetic susceptibility either. Structural relaxation took place interval 560 K causing increase susceptibility. At temperatures higher...