Solvothermal synthesis of bismuth orthovanadate and its studu as pigment for paint -and -varnish industry

Bismuth orthovanadate was synthesized by solvothermal method. Physicochemical properties (oilabsorption power of I and II type, pH of the aqueous extract, the particle size and density) of the pigment obtained were determined. Corrosion stability of the synthesized pigment was studied by electrochemical method. It has been established that the chemical compound concerned is characterized by low solubility and can be used inthe paint-and-varnish industry as a replacement for yellow leadbearing and chromate pigments

Electrodeposition of nickel and cobalt alloys with organic ligands in solution

Electrodeposition of multicomponent nickel and/or cobalt alloys with nonmetallic inclusions from the complex electrolytes containing citric or malic acid was investigated. It has been confirmed that the decrease in the stability of metal complexes formed provides an increase in metal current efficiency. The use of malate complex electrolytes allows to diminish the effect of nickel and cobalt anomalous codeposition. Nickel-cobalt alloy electrodeposition fromcitrate electrolytes is accompanied by an overstoichiometric electrodeposition of nonmetallic components,phosphorus in particular

The use of pulse electrolysis for copper plating on steel and cast iron bases from citrate electrolyte

Process of electrochemical deposition of copper on a steel and iron substrate from citrate electrolytes was investigated. It is determined that the material of cathode greatly influences the kinetics of copper plating process. Influence of pulse electrolysis on a range of working density of current, a current efficiency of copper and porosity of coatings were investigated. It is determined that application of a pulse mode increases a range of working density of current and improves quality of the received coatings

Electrochemical deposition of nickel coatings from acetate-chloride electrolyte in pulse mode

The process of electrodepositing of nickel from acetate-chloride electrolyte at low temperature in a pulsed mode has been investigated. It is established that application of pulsed electrolysis mode allows to increase the working current density up to 9 A/dm2. A nanostructured nickel coating with a maximum size of crystallites of 200 nm is obtained. The results show that the use of pulsed electrolysis makes possible to reduce porosity of coating thicknesses up to 20 ?m.The process of electrodepositing of nickel from acetate-chloride electrolyte at low temperature in a pulsed mode has been investigated. It is established that application of pulsed electrolysis mode allows to increase the working current density up to 9 A/dm2. A nanostructured nickel coating with a maximum size of crystallites of 200 nm is obtained. The results show that the use of pulsed electrolysis makes possible to reduce porosity of coating thicknesses up to 20 ?m,Chemistry and Technology of Inorganic Materials and Substance

Synthesis and properties of mixed iron and bismuth vanadates

The solvothermal method for the synthesis of mixed iron and bismuth vanadates was proposed. Physicochemical properties of the obtained samples: oil absorption, pH of the aqueous extract, particle size, density, – were determined. Electrochemical studies ofthe inhibitory properties of vanadates relative to the steel substrate were conducted. It is established that the received mixed iron and bismuth vanadates may be used in the paint industry as a replacement for lead-bearing and chromate pigments

Methods for processing ash residues of TPS vanadium containing slurry

Application of vanadium industrial waste complex processing provides the decision of two main tasks: expanding the raw material base for extremely scarce metal and reduction of an environmental impact on nature. Combined and hydrometallurgical methods of vanadium extraction from the ash residues of TPS vanadium sludge have been developed. These methods allow to extract up to 95% of vanadium that contains in waste, and to obtain a vanadium product suitable for using in different areas of industry

Vanadium-containing wastes recycling for enterprises using fuel oil: high expectations

Demand for vanadium and its compounds grows: vanadium compounds are extensively used in various industries. Vanadium compounds extraction from industrial wastes is more cost-effective than from natural raw materials. In Belarus, sludge from thermal power plants and wastes of sulfuric acid manufacturers are the sources of secondary vanadium-containing raw materials. Vanadium-containing wastes generation and accumulation in the territory of the Republic of Belarus for recent years are analyzed. The article demonstrates that the development and implementation of recycling procedures for these wastes will resolve environmental problems and save valuable substances not common in nature but applicable in industrial production in the Republic of Belarus

ОСОБЕННОСТИ СТРУКТУРЫ ПОВЕРХНОСТИ МЕДНЫХ ПОКРЫТИЙ ПРИ ВВЕДЕНИИ В ЭЛЕКТРОЛИТ МЕДНЕНИЯ УЛЬТРАДИСПЕРСНЫХ АЛМАЗОВ И АЛМАЗНОЙ ШИХТЫ

The properties of composite copper coatings with inclusions of ultradispersed diamonds (UDD) and diamond soot (DS) in copper citrate electrolyte have been investigated. The concentrations of diamond-containing additives have been varied in the range of 0.2–2 g/l. Sizes of copper microcrystals, UDD and DS particles were determined from the scanning electron microscopy images. By means of the X-ray fluorescent analysis, the interrelation between concentration of diamondbearing additives in electrolyte and their content in the obtained coatings has been established. The minimal microporosity and the maximal microhardness correspond to concentration of 1.0 g/l for both UDD and DS suspensions in citrate copper coating electrolytes. Copper-UDD coating has increased protective properties (porosity 2 time/cm2 ) and uniformity of distribution of diamond-bearing particles on a surface in comparison with a monocoating and copper-DS coating. Using UDD in citrate copper coating electrolyte with a concentration of diamond-bearing additive of 1.0 g/l is more preferable for production of composite electrochemical coatings. Исследованы свойства композиционных медных покрытий с включениями ультрадисперсных алмазов (УДА) и алмазной шихты (АШ) в цитратном электролите меднения. Концентрации алмазосодержащих добавок варьировали в диапазоне 0,2–2 г/л. По изображениям, полученным с помощью растрового электронного микроскопа, определили размеры микрокристаллов меди, частиц УДА и АШ. С помощью рентгенофлуоресцентного анализа установили взаимосвязь между концентрацией алмазосодержащих добавок в электролите и их содержанием в полученных покрытиях. Минимальная микропористость и максимальная микротвердость соответствует концентрации 1,0 г/л как для суспензии с УДА, так и для суспензии с АШ в цитратных электролитах меднения. Покрытия медь-УДА обладают повышенными защитными свойствами (пористость 2 пор/см2 ) и однородностью распределения алмазосодержащих частиц по поверхности в сравнении с монопокрытием и медь-АШ. Для получения композиционных электрохимических покрытий предпочтительнее использовать УДА в цитратном электролите меднения с концентрацией алмазосодержащей добавки 1,0 г/л.

Solvothermal synthesis of bismuth orthovanadate and its studu as pigment for paint -and -varnish industry

Bismuth orthovanadate was synthesized by solvothermal method. Physicochemical properties (oilabsorption power of I and II type, pH of the aqueous extract, the particle size and density) of the pigment obtained were determined. Corrosion stability of the synthesized pigment was studied by electrochemical method. It has been established that the chemical compound concerned is characterized by low solubility and can be used inthe paint-and-varnish industry as a replacement for yellow leadbearing and chromate pigments

Electrodeposition of nickel and cobalt alloys with organic ligands in solution

Electrodeposition of multicomponent nickel and/or cobalt alloys with nonmetallic inclusions from the complex electrolytes containing citric or malic acid was investigated. It has been confirmed that the decrease in the stability of metal complexes formed provides an increase in metal current efficiency. The use of malate complex electrolytes allows to diminish the effect of nickel and cobalt anomalous codeposition. Nickel-cobalt alloy electrodeposition fromcitrate electrolytes is accompanied by an overstoichiometric electrodeposition of nonmetallic components,phosphorus in particular