Dissertations / Theses on the topic 'Процес електрохімічний'
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Білоус, Тетяна Андріївна, and Геннадій Георгійович Тульський. "Електрохімічний синтез пероксіоцтової кислоти." Thesis, НТУ "ХПІ", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/31696.
Full textСачанова, Юлія Іванівна, Валерія Олегівна Проскуріна, Ірина Юріївна Єрмоленко, and Тетяна Василівна Школьнікова. "Аналіз поляризаційних діаграм нікелевого електрода в лужному розчині." Thesis, Національний технічний університет "Харківський політехнічний інститут", 2017. http://repository.kpi.kharkov.ua/handle/KhPI-Press/41641.
Full textВороніна, Олена Володимирівна. "Електродні процеси на сплавах та сполуках ванадію в водневій енергетиці." Thesis, НТУ "ХПІ", 2018. http://repository.kpi.kharkov.ua/handle/KhPI-Press/38323.
Full textThesis for granting the Degree of Candidate of Technical sciences in speciality 05.17.03 – Technical Electrochemistry. – National Technical University "Kharkiv Polytechnical Institute", Kharkiv, 2018. The thesis deals with the development of the technological process of hydrogen production using new electrode materials based on vanadium alloys and aluminum alloys. The vanadium based electrode material exclude the formation of ferrites in alkaline electrolysis. Aluminum alloys exclude the oxygen evolution on the anodes due to the corrosion process with hydrogen depolarization. Therefore it is possible to produce hydrogen on both electrodes in electrolyzers without membrane in alkaline water electrolysis. The kinetic dependences and mechanisms of hydrogen evolution on aluminum alloys have been determined, which leads to the reduce of overvoltage of hydrogen evolution reaction on cathodes and produce hydrogen on anodes by aluminum dissolving. Experimental-industrial tests of oxygen-free hydrogen production in developed electrolyzers at cell voltages of 0.3-1 V are presented. This allows to reduce the material and energy costs of electrolysis.
Вороніна, Олена Володимирівна. "Електродні процеси на сплавах та сполуках ванадію в водневій енергетиці." Thesis, НТУ "ХПІ", 2018. http://repository.kpi.kharkov.ua/handle/KhPI-Press/38316.
Full textThesis for granting the Degree of Candidate of Technical sciences in speciality 05.17.03 – Technical Electrochemistry. – National Technical University "Kharkiv Polytechnical Institute", Kharkiv, 2018. The thesis deals with the development of the technological process of hydrogen production using new electrode materials based on vanadium alloys and aluminum alloys. The vanadium based electrode material exclude the formation of ferrites in alkaline electrolysis. Aluminum alloys exclude the oxygen evolution on the anodes due to the corrosion process with hydrogen depolarization. Therefore it is possible to produce hydrogen on both electrodes in electrolyzers without membrane in alkaline water electrolysis. The kinetic dependences and mechanisms of hydrogen evolution on aluminum alloys have been determined, which leads to the reduce of overvoltage of hydrogen evolution reaction on cathodes and produce hydrogen on anodes by aluminum dissolving. Experimental-industrial tests of oxygen-free hydrogen production in developed electrolyzers at cell voltages of 0.3-1 V are presented. This allows to reduce the material and energy costs of electrolysis.
Яблонський, Р. В., and О. О. Бутенко. "Особливості електрохімічних процесів в нікель-цинкових акумуляторах." Thesis, КНУТД, 2016. https://er.knutd.edu.ua/handle/123456789/4565.
Full textБілоус, Тетяна Андріївна, and Геннадій Георгійович Тульський. "Вплив концентрації оцтової кислоти на кінетику електрохімічних процесів." Thesis, Львівський національний університет ім. Івана Франка, 2017. http://repository.kpi.kharkov.ua/handle/KhPI-Press/31754.
Full textНовік, Н. О., and І. С. Макєєва. "Електрохімічні та фізико-хімічні процеси в нікель-кадмієвих акумуляторах." Thesis, КНУТД, 2016. https://er.knutd.edu.ua/handle/123456789/4552.
Full textШтефан, Вікторія Володимирівна. "Електрохімічні процеси в технології функціональних молібден- та вольфрамвмісних покриттів." Thesis, Національний технічний університет "Харківський політехнічний інститут", 2019. http://repository.kpi.kharkov.ua/handle/KhPI-Press/41356.
Full textThesis for granting the Degree of Doctor of Technical sciences in speciality 05.17.03 – Technical Electrochemistry. – National Technical University "Kharkiv Politechnical Institute", 2019. The dissertation is devoted to the development of scientific principles of electro-chemical processes in the technology of functional molybdenum and tungsten-containing coatings. The hypothesis of the possibility of controlling the nature of electrochemical processes, with the participation of molybdenum (VI) ions and tungsten (VI) associated with the achievements in the study of the state of the forms of their ions in aqueous solutions is formed and experimentally proved. The influence of the nature of molybdenum oxyanion on the kinetics of cathode processes in complex electrolytes within a wide range of pH: ammonium pyrophosphate (pH> 7) and ammonia-trilonate (pH <7) is proved. The understanding of the controlled influence with the form of molybdenum oxoanions on the polarization of the cathode process for the change of the limiting stage is developed. It has been confirmed that the cathode processes in the precipitation of the Co-Mo alloy include the restoration of molybdenum oxoanions due to not only the electrochemical stage but with the participation of oxi-dation-reduction reactions in which the reduction products are those of combined electrode reactions - cobalt and adsorbed hydrogen. The influence of the electrolytes composition and electrolysis parameters on functional properties of coatings (corrosion resistance, microhardness, catalytic activity in the reaction of CO conversion and electrochemical hydrogen release) is determined. The compositions of electrolytes are treated experimentally to create conversion coatings on silver surfaces and D16 alloy. It is proved that the change of pH in the electrolyte of the anode-oxide coating on the D16 alloy changes the form of oxoanions and increases the corrosion re-sistance of the system. It is established that with the thiosulfate concentration in-crease, the silver potential moves toward negative values due to the formation of [Ag(S2O3)n](2n+1)-, which allows the process of oxidation-reduction reactions involv-ing tungsten and silver polyanions. The use of a silver surface tester on the basis of tungstate is 2 times more efficient than a chromate-based passivator. A catalyst is obtained for the Ti|TiOx·WOp·CeOy·ZrOz·CuOn composition, which is characterized by high conversion activity of CO (up to 95% at 420 °C). Anodic oxide coatings on OT4-0 containing molybdenum compounds exhibit suppressed conductivity and heat resistance of the anode layer. The oxide coatings formed from the molybdenum-containing electrolyte on a steel 08Х18Н10 have an electrical resistance of 2.6·1010…3.6·1010 Ω. The effectiveness of scientific study is proved by the positive results of laboratory and industrial testing and implementation.
Штефан, Вікторія Володимирівна. "Електрохімічні процеси в технології функціональних молібден- та вольфрамвмісних покриттів." Thesis, Національний технічний університет "Харківський політехнічний інститут", 2018. http://repository.kpi.kharkov.ua/handle/KhPI-Press/41358.
Full textThesis for granting the Degree of Doctor of Technical sciences in speciality 05.17.03 – Technical Electrochemistry. – National Technical University "Kharkiv Politechnical Institute", 2019. The dissertation is devoted to the development of scientific principles of electro-chemical processes in the technology of functional molybdenum and tungsten-containing coatings. The hypothesis of the possibility of controlling the nature of electrochemical processes, with the participation of molybdenum (VI) ions and tungsten (VI) associated with the achievements in the study of the state of the forms of their ions in aqueous solutions is formed and experimentally proved. The influence of the nature of molybdenum oxyanion on the kinetics of cathode processes in complex electrolytes within a wide range of pH: ammonium pyrophosphate (pH> 7) and ammonia-trilonate (pH <7) is proved. The understanding of the controlled influence with the form of molybdenum oxoanions on the polarization of the cathode process for the change of the limiting stage is developed. It has been confirmed that the cathode processes in the precipitation of the Co-Mo alloy include the restoration of molybdenum oxoanions due to not only the electrochemical stage but with the participation of oxi-dation-reduction reactions in which the reduction products are those of combined electrode reactions - cobalt and adsorbed hydrogen. The influence of the electrolytes composition and electrolysis parameters on functional properties of coatings (corrosion resistance, microhardness, catalytic activity in the reaction of CO conversion and electrochemical hydrogen release) is determined. The compositions of electrolytes are treated experimentally to create conversion coatings on silver surfaces and D16 alloy. It is proved that the change of pH in the electrolyte of the anode-oxide coating on the D16 alloy changes the form of oxoanions and increases the corrosion re-sistance of the system. It is established that with the thiosulfate concentration in-crease, the silver potential moves toward negative values due to the formation of [Ag(S2O3)n](2n+1)-, which allows the process of oxidation-reduction reactions involv-ing tungsten and silver polyanions. The use of a silver surface tester on the basis of tungstate is 2 times more efficient than a chromate-based passivator. A catalyst is obtained for the Ti|TiOx·WOp·CeOy·ZrOz·CuOn composition, which is characterized by high conversion activity of CO (up to 95% at 420 °C). Anodic oxide coatings on OT4-0 containing molybdenum compounds exhibit suppressed conductivity and heat resistance of the anode layer. The oxide coatings formed from the molybdenum-containing electrolyte on a steel 08Х18Н10 have an electrical resistance of 2.6·1010…3.6·1010 Ω. The effectiveness of scientific study is proved by the positive results of laboratory and industrial testing and implementation.
Водолажченко, С. А., Світлана Германівна Дерібо, Б. В. Павлов, and Р. Ю. Красношапко. "Анодні процеси на платині у розчинах органічних кислот." Thesis, Харківський національний університет міського господарства ім. О. М. Бекетова, 2019. http://repository.kpi.kharkov.ua/handle/KhPI-Press/45478.
Full textМатрунчик, Ольга Леонідівна, Геннадій Георгійович Тульський, Тетяна Андріївна Білоус, and Т. О. Подушка. "Дослідження кінетики анодного процесу в електрохімічному синтезі метансульфонової кислоти." Thesis, НТУ "ХПІ", 2018. http://repository.kpi.kharkov.ua/handle/KhPI-Press/37591.
Full textМіщенчук, В. В., М. М. Ткачук, and В. Д. Юзькова. "Вплив структури подвійного електричного шару на кінетику електрохімічних процесів." Thesis, БДМУ, 2017. http://dspace.bsmu.edu.ua:8080/xmlui/handle/123456789/16855.
Full textБілоус, Тетяна Андріївна, and Геннадій Георгійович Тульський. "Обґрунтування показників електрохімічних процесів в водних розчинах оцтової кислоти." Thesis, НТУ "ХПІ", 2017. http://repository.kpi.kharkov.ua/handle/KhPI-Press/31721.
Full textСердюк, Василь Олексійович, Василий Алексеевич Сердюк, and Vasil OleksIyovich Serdyuk. "Мембранні електрохімічні пристрої в процесах регенерації гальванічних розчинів." Thesis, Сумський державний університет, 2021. https://essuir.sumdu.edu.ua/handle/123456789/86159.
Full textThe dissertation is devoted to the development of scientific and practical bases of improvement of regeneration processes in galvanic technological solutions by means of a membrane electrolysis method. An analytical review of scientific and technical information on the areas of application and operating conditions of membrane electrochemical devices were conducted. Based on the analysis of scientific sources, the effectiveness of the method of membrane electrolysis in the purification processes of aqueous solutions from harmful and toxic substances is shown. It is shown that the improvement of the quality and service life of technological chromium-containing galvanic baths is possible due to the operation of membrane electrochemical devices. The method of voltammetry with linear potential deployment was used as a study of the electrolitic reduction of metal ions present in the chromium-containing solution. Polarization curves the dependences of the magnitude of the current on the level of applied voltage for the cathodic release of cadmium and zinc at different temperatures. Polarization curves show a decrease in overvoltage in the presence of Zn2+ ions, the presence of Cd2+ ions contributes to a significant polarization of the cathode, and an increase in temperature reduces the polarization of the cathode. The presence of cadmium and zinc in the cathode deposit, the ions of which were present as impurities in the anolyte, was confirmed by electron microscopy with the functions of X-ray microanalysis. Polarization curves and electron microscopy methods established the transfer of ions through the cation exchange membrane between the anode and cathode chambers of this membrane electrochemical device. The optimal pH range of values electrochemical module cathode chamber for the release of metallic cadmium and zinc at the cathode has been established. In the result of statistical processing of experimental data, the regression equation of environment change of cathode chambers of electroreduction of cadmium and zinc in the mass transfer of data of metal ions through a cation exchange membrane RALEX®CM-PES 11-66 of the electrochemical module has received.The experimentally and statistically confirmed pH range in the range of 1.5-1.8 allows obtaining in the form of valuable products metallic cadmium and zinc, which can be used in metallurgy in contrast to their mixture of hydroxides in galvanic settlers. As a result, the conducted researches laboratory model of the membrane electrochemical device has developed, the regularities of mass transfer of Zn2+ and Cd2+ ions through the cation exchange membrane RALEX®CM-PES 11-66 had experimentally investigated.Thanks to experimental research, it has become possible to create new industrial electrochemical devices that can effectively regenerate the contents of technological baths. In the course of work, the regularities of influence of the following factors on the process of membrane electrolysis were studied: concentration of polluting metal ion, current density, temperature and hydrodynamic conditions of the near-membrane zone of the anolyte. The conditions for effective regeneration of galvanic solutions have been experimentally established. The effect of the concentration of the metal ion contaminant in the catholyte at a stable temperature and current density on the cathode yield of the metal was determined experimentally. Experimental studies were also performed at constant concentrations of pollutant metal ions in anolytes and variable current densities or different values of system temperature. Particular attention was paid to the use of forced mechanical stirring of the membrane zone of the anolyte. The increase of mass transfer through the cation exchange membrane RALEX®CM-PES 11-66 in the process of electrolysis due to the increase of the concentration of the contaminating ion in the anolyte, the increase of the temperature, and the increase of the current density on the membrane is proved. As a result of theoretical and experimental generalizations, the current limit density for simulated solutions of cadmium and zinc galvanic coatings passivations are determined. The increase of metal yield up to 50% as a result of forced mechanical mixing was established.The results of experimental studies have been analyzed mathematically. As a result of improving the known mathematical model, the kinetic parameters of research results with changes in the concentrations of contaminating ions of passivation baths and with changes in hydrodynamic conditions had established, instantaneous rate constants of cathodic electrodeposition of cadmium and zinc had found. Statistical analysis of research results is described adequately by the laws of membrane electrolysis by regression equations. The constructed equations of direct regressions of experimental researches had checked by regression and correlation analyzes. In the process of regression analysis, the coefficients in the regression equations were specified. Correlation analysis showed the different closeness of the relationships as a result of finding Pearson's correlation coefficients, which indicates the approximation of some experiments to both linear correlation and vice versa. As a result of general mathematical processing of the experiments results from data with changes in concentration, current density, temperature, and different hydrodynamic conditions, multifactor regression equations of membrane cathode electrodeposition of cadmium and zinc had constructed. Statgraphics Centurion 18-64X was used to find multifactor regression equations. The multifactor regression equations, obtained for the first time, show the share of influence of each variable factor by means of the corresponding coefficients. According to the constructed models, the influence of each variable factor on the electrical reduction processes of cadmium and zinc was determined. Thus constructed mathematical models allow to effectively carry out regeneration of passivating solutions by regulating the influence of variable factors on the process. The statistical significance of multifactorial regression equations was confirmed by the criteria of Student, Fisher, and Darbin-Watson. The industrial electrochemical device, allowing to regenerate effectively the structure of technological passivation baths of cadmium and zinc galvanic coatings, has been created in the result of introducing the experimental and mathematical researches in the industrial conditions. The structural dimensions and operating parameters of the industrial electrochemical module are established The adequacy of multifactor regression mathematical models of cadmium and zinc electroreduction has been practically confirmed on real passivation production baths. As a result of industrial implementation and operation of membrane electrochemical devices, in addition to effective purification of these process baths from Cd2+ and Zn2+ ions, the regeneration process of hexavalent chromium ions from Cr3+ ions has been theoretically and experimentally proved. Based on the analysis of information sources and the use of titrometric and photocolorimetric analyzes, the presence of chromate ion regeneration process at the lead anode was established in industrial experimental conditions, in technological baths of passivations of cadmium and zinc galvanic coatings. An experimental study of the anodic regeneration process confirmed the gradual increase in the concentration of hexavalent chromium ions and the gradual decrease in the concentration of Cr3+ ions in the passivation baths of galvanic coatings. As a result of the conducted researches, the efficiency of chromate regeneration was established at the level of 0.6-1.59 g / l per day in working passivation baths with a volume of 150 l. The reduction of the ecological danger level of passivation baths as a result of long-term operation of electrochemical modules in them due to constant regeneration of chromates had practically established. This process led to a decrease in the total concentration of chromates. It is proved that the operation of the created membrane electrochemical devices reduces the load on the treatment facilities of the galvanic section. The constant anodic regeneration of chromate anions installed during the operation of the electrochemical modules made it possible to create high-quality conversion chromate films on the surface of cadmium and zinc galvanic coatings and to save sodium dichromate. Due to the formation of chromates directly in the passivating baths, the need to often add sodium dichromate from the outside has disappeared. The reduction of working concentrations of sodium dichromate in technological baths from 100 - 200 g / l to 30 - 50 g / l had established due to its reaction with a coating of parts and removal to washing baths, which as a result allowed to reduce their ecological danger by 3.75 times. The calculation procedure on the ecological and economic efficiency of the electrochemical devices operation has been applied for the first time. Thanks to the calculations, the effectiveness of the created industrial modules of electrochemical in technological baths of passivation of cadmium and zinc galvanic coatings is shown. Experimental and statistical researches, their verification in industrial conditions of real factory galvanic production, and also the introduction of technological processes electrochemical regeneration of chromium-containing technological galvanic solutions in JSC Sumy plant "Nasosenergomash" (appendices Д, E, Ж), allow recommending to use this membrane electrolysis method for regeneration industrial chromiumcontaining technological solutions of our country.
Сальков, І. М., and О. О. Бутенко. "Особливості протікання електрохімічних процесів на позитивному електроді срібно-цинкового акумулятора." Thesis, КНУТД, 2016. https://er.knutd.edu.ua/handle/123456789/4566.
Full textМирошниченко, Ю. В., and Сергій Анатолійович Лещенко. "Інтенсифікація процесу нікелювання у псевдозрідженому шарі інертних часток." Thesis, Національний технічний університет "Харківський політехнічний інститут", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/48778.
Full textНовік, Н. О. "Розробка процесу нанесення латуні на різні метали." Thesis, Київський національний університет технологій та дизайну, 2019. https://er.knutd.edu.ua/handle/123456789/13985.
Full textКрасовська, Л. А., and Борис Іванович Байрачний. "Дослідження процесу електрохімічного отримання сплаву Fe-Cо." Thesis, НТУ "ХПІ", 2007. http://repository.kpi.kharkov.ua/handle/KhPI-Press/20619.
Full textМовчун, П. О., and В. З. Барсуков. "Електрохімічні та фізико-хімічні процеси в марганцево-цинкових елементах з сольовим електролітом." Thesis, КНУТД, 2016. https://er.knutd.edu.ua/handle/123456789/4559.
Full textБілоус, Тетяна Андріївна, and Геннадій Георгійович Тульський. "Дослідження впливу добавок галоген-іонів на кінетику анодних процесів при електрохімічному синтезі пероксиоцтової кислоти." Thesis, НТУ "ХПІ", 2018. http://repository.kpi.kharkov.ua/handle/KhPI-Press/37590.
Full textТульська, Альона Геннадіївна. "Деполяризація анодного процеса SO₂ в електрохімічному синтезі водню." Thesis, НТУ "ХПІ", 2015. http://repository.kpi.kharkov.ua/handle/KhPI-Press/17098.
Full textThesis for the Degree of Candidate of Technical sciences in specialty 05.17.03 – Technical Electrochemistry. – National Technical University "Kharkiv Polytechnical Institute", Kharkоv 2015. The thesis deals with the anodic depolarization of SO₂ in hydrogen by electrolysis of solutions of sulphate acid. Based on thermodynamic analysis set conditions for the implementation of anodic depolarization process with SO₂. Proved part oxygenated radical nature of the particles in the oxidation of SO₂ on the surface of the platinum anode. The effect of the anode material, electrolyte concentration and temperature on the kinetic parameters of oxidation of SO₂. The composition of the active coating of the gas diffusion anode, exhibits high kinetic parameters in a wide range of current densities, and a method of its application were proposed. The durability of anode materials have been tested. The results of kinetic studies confirmed the laboratory cell. The possibility of using sulphur-acid method of producing hydrogen for utilization of SO₂. It was determined that the specific energy consumption was 2.6 ... 3.1 kW ∙ h ∙ nm³ H₂ at a current density of 500 ... 1000 A∙m¯². Conducted pilot tests, which proved the feasibility of the depolarization of the anodic process of SO₂ in sulphur-acid method of producing hydrogen.