scholarly journals IMPROVEMENT OF PROTECTIVE PROPERTIES OF ANTI-CORROSIVE MASTIC

2020 ◽  
Author(s):  
И.А. Успенский ◽  
И.В. Фадеев ◽  
А.И. Ушанев ◽  
С.Н. Кулик ◽  
Е.В. Митрохина
Keyword(s):  
Corrosion Damage ◽  
Diffusion Resistance ◽  
Protective Film ◽  
Agricultural Machinery ◽  
Stationary Potential ◽  
Positive Direction ◽  
Protective Properties ◽  
Positive Side ◽  
Object Of Study ◽  
Anticorrosion Properties

Целью исследований явилось совершенствование защитных свойств противокоррозионной мастики «Барьер» для обработки сельскохозяйственных машин и оборудования животноводческих комплексов. Объект исследования: олигомер Д-10ТМ, который добавляли в состав мастики «Барьер» в массовом соотношении 100:5 для улучшения ее противокоррозионных свойств. Для экспериментов использовали образцы из стали Ст3 размерами 100´25´2 мм. В качестве электролита служил 3 %-й раствор хлорида натрия. Защитную пленку на образцах получали методом окунания образцов в составы. Медленное (со скоростью 0,02-0,03 м/с) извлечение образцов обеспечивало одинаковую толщину пленки на всей их поверхности. Пленку на образцах высушивали при комнатной температуре (18-22 °С) в течение 24 ч. Исследование диффузионной стойкости пленок исследуемых составов в электролите показало, что введение олигомера Д-10 ТМ в состав мастики «Барьер» повышает сплошность покрытия почти на 30 %. Для электрохимических исследований противокоррозионных свойств составов образцы с покрытиями погружали в электролит и выдерживали в течение 24 часов. Значение стационарного потенциала образцов измеряли через каждые 4 часа с помощью потенциостата П-5848. Эффективность противокоррозионных свойств составов оценивали по смещению потенциала начала активации электрода в положительную сторону. Начальный электродный потенциал стали −0,44 В с защитным покрытием сразу смещается в более положительную сторону: с пленкой из мастики «Барьер» до −0,26 В, из полученной композиции – до −0,18 В. Причем активация металла начинается при положительном потенциале, равном +0,05…+0,075 В, т.е. интервал изменения потенциала от начального значения до начала активации составляет 0,49-0,525 В, что подтверждает высокие ингибиторные свойства полученной композиции. Следовательно, смесь мастики «Барьер» и олигомера Д-10ТМ может быть рекомендована в качестве композиции для защиты сельскохозяйственных машин и оборудования животноводческих комплексов от коррозионного разрушения. The aim of the research was to improve the protective properties of the anti-corrosion mastic “Barrier” for processing agricultural machinery and equipment of livestock complexes. Object of study: oligomer D-10TM, which was added to the composition of the "Barrier" mastic in a mass ratio of 100: 5 to improve its anticorrosion properties. For the experiments, we used samples of St3 steel with sizes 100´25´2. A 3% sodium chloride solution served as an electrolyte. A protective film on the samples was obtained by dipping the samples into the compositions. Slow (at a speed of 0.02-0.03 m/s) extraction of samples ensured the same film thickness over their entire surface. The film on the samples was dried at room temperature (18-22°C) for 24 hours. A study of the diffusion resistance of the films of the studied compositions in the electrolyte showed that the introduction of the oligomer D-10 TM in the composition of the "Barrier" mastic increases the coating continuity by almost 30%. For electrochemical studies of the anticorrosive properties of the compositions, coated samples were immersed in an electrolyte and held for 24 hours. The value of the stationary potential of the samples was measured every 4 hours using a P-5848 potentiostat. The effectiveness of the anticorrosive properties of the compositions was evaluated by the shift in the potential of the beginning of electrode activation in a positive direction. The initial electrode potential of steel with −0.44 V with a protective coating immediately shifts to a more positive side: with a film from mastic “Barrier” up to −0.26 V, from the resulting composition – up to −0.18 V. Moreover, metal activation begins at positive potential equal to +0.05 ... +0.075 V, i.e. the range of potential changes from the initial value to the start of activation is 0.49-0.525 V, which confirms the high inhibitory properties of the resulting composition. Consequently, a mixture of Barrier mastic and D-10TM oligomer can be recommended as a composition for protecting agricultural machinery and equipment of livestock complexes from corrosion damage.

scholarly journals The effect of junctions on the propagation of electric waves along conductors

1913 ◽  
Vol 88 (601) ◽  
pp. 103-110
Keyword(s):  
Cylindrical Shell ◽  
Wave Length ◽  
General Character ◽  
Original Form ◽  
Annular Space ◽  
Approximate Methods ◽  
Positive Direction ◽  
Positive Side ◽  
The Waves ◽  
Electric Waves

Some interesting problems in electric wave propagation are suggested by an experiment of Hertz. In its original form waves of the simplest kind travel in the positive direction (fig. 1), outside an infinitely thin conducting cylindrical shell, AA, which comes to an end, say, at the plane z = 0. Co-axial with the cylinder a rod or wire BB (of less diameter) extends to infinity in both directions. The conductors being supposed perfect, it is required to determine the waves propagated onwards beyond the cylinder on the positive side of z , as well as those reflected back outside the cylinder and in the annular space between the cylinder and the rod. So stated, the problem, even if mathematically definite, is probably intractable; but if we modify it by introducing an external co-axial con­ducting sheath CC (fig. 2), extending to infinity in both directions, and if we further suppose that the diameter of this sheath is small in comparison with the wave-length (λ) of the vibrations, we shall bring it within the scope of approximate methods. It is under this limitation that I propose here to consider the present and a few analogous problems. Some considerations of a more general character are prefixed.

scholarly journals The high temperature oxidation of metals

1926 ◽  
Vol 111 (757) ◽  
pp. 203-209 ◽  
Keyword(s):  
High Temperature ◽  
Oxide Film ◽  
High Temperature Oxidation ◽  
Protective Action ◽  
Protective Film ◽  
Parent Metal ◽  
Compact Structure ◽  
Temperature Oxidation ◽  
Protective Properties ◽  
Porous Oxide

The oxidation of metals at high temperatures has been investigated with some thoroughness by Pilling and Bedworth. They found that the metals could be divided into two great classes according to the nature of the oxide produced. If the volume of the oxide is greater than that of the metal from which it was produced an oxide film of compact structure and protective properties will be produced. If the volume of the oxide is less than that of its parent metal a porous oxide is produced which has no protective action whatever. The oxidation of the metals of the first class is controlled by the diffusion of oxygen through the protective film of oxide and the application of the diffusion laws to this process lead us to expect that the oxidation law will be W 2 = K t W 2 = amount of oxygen absorbed t = time K is a constant.

Comparison studies of the protective properties of silane/polyrhodanine and polyrhodanine/silane bilayer coatings applied on stainless steel

2018 ◽  
Vol 65 (2) ◽  
pp. 190-196 ◽  
Author(s):  
Edyta Owczarek
Keyword(s):  
Stainless Steel ◽  
Photoelectron Spectroscopy ◽  
Steel Surface ◽  
Steel Substrate ◽  
Dip Coating ◽  
Stainless Steel Surface ◽  
Protective Properties ◽  
Content Type ◽  
Anticorrosion Properties ◽  
Bilayer Coatings

Purpose The purpose of this paper is to evaluate and compare the protective, anticorrosion properties of silane- and polyrhodanine-based bilayer coatings pRh/IBTES and IBTES/pRh on an X20Cr13 stainless steel substrate. Design/methodology/approach IBTES/pRh and pRh/IBTES have been coated using the dip-coating method and the cyclic voltammetry technique. The electrochemical measurements have been used to assess the anticorrosion properties of the resulting bilayer coatings. Morphological and chemical characterizations have been performed using scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). Findings The results clearly show that the combination of both the deposits of polyrhodanine and silane yields a more protective structure that affords better protection against corrosion with time. The best barrier properties are achieved by the substrates coated with polyrhodanine film upon which silane is subsequently adsorbed – the pRh/IBTES bilayer coating. Originality/value The paper reveals that the procedure of modification of silane films with polyrhodanine had a marked effect on the anti-corrosive performance of the obtained two types of bilayers coatings (pRh/IBTES, IBTES/pRh) applied on a stainless steel surface. The coating where polyrhodanine was first electrodeposited on the steel surface and then the silane layer adsorbed (pRh/IBTES) achieved the best protective properties.

scholarly journals The mechanical life of implements operating in corrosive service

2021 ◽  
Vol 273 ◽  
pp. 07004
Author(s):  
Galia Kokieva ◽  
Marfa Ochlopkova ◽  
Yurii Shaposhnikov ◽  
Varvara Trofimova
Keyword(s):  
Storage Period ◽  
Corrosion Damage ◽  
Operating Conditions ◽  
Organic Fertilizers ◽  
Protective Film ◽  
Mechanical Wear ◽  
Wear And Corrosion ◽  
Main Thing ◽  
Working Bodies ◽  
Agricultural Machines

In severe operating conditions, there are machines for the preparation and introduction of mineral and organic fertilizers, herbicides, pesticides. They fail in order after two or three years due to corrosion and corrosion-mechanical wear. Under these conditions, the main thing is not to protect individual details, but the protection of the machine as a whole. Disclosure of the mechanism and patterns of corrosion-mechanical wear and corrosion of structural materials in aggressive environments made it possible to scientifically substantiate the most effective ways to increase the service life of machines at the stages of design, manufacturing and operation. Passive working bodies (frame, body, tank) polymer and gummed coatings are reliably protected from corrosion. Corrosion damage to the details of agricultural machines during storage. The illustrated surfaces of the working bodies of plows, seeders, cultivators, disk harrows and other agricultural machines in the storage period are oxidized and coated with rust. In some cases, it appears due to the destruction of the protective film of paint in others - due to violation of the storage rules. The lower parts of agricultural machines made of simple carbonistic structural and unfounded steels, in contrast to parts remote from the soil and no contact with it, corroded intensively.

Protection of the working units of agricultural machinery during storage

10.12737/1352 ◽  
2013 ◽  
Vol 8 (3) ◽  
pp. 75-79
Author(s):  
Сушинцев ◽  
V Sushintsev ◽  
Курбанов ◽  
Rustam Kurbanov ◽  
Морозов ◽  
...  
Keyword(s):  
Comprehensive Evaluation ◽  
Economic Feasibility ◽  
Waste Materials ◽  
Agricultural Machinery ◽  
Protective Properties ◽  
Bench Tests ◽  
Corrosion Fracture ◽  
Work Surface ◽  
Materials Recycling ◽  
And Storage

During the usage and storage agricultural machinery are corrosion fracture. There are many known protective materials to protect against corrosion, which are often expensive. The authors offer a technology of obtaining an anticorrosive material – bituminous composition, that will solve a number of problems: the waste materials recycling and the high cost, lack of protective materials. The bench tests were conducted after determining the optimal content of the bituminous composition. During the year, the known and available protective materials , as well as the newly formed bituminous composition, exposed to atmospheric agents, as provided in the combined storage and in the open air. As a result of a comprehensive evaluation of the protective properties of anti-corrosion materials by method of application on the work surface and the economic feasibility has been proposed a technology of bituminous composition, the protective properties of which were the highest, at the lowest cost .

scholarly journals ASSESSMENT OF THE DEPTH AND RATE OF CORROSION IN STEEL REINFORCEMENT OF REINFORCED CONCRETE CULVERTS

2020 ◽  
Author(s):  
Alexandr Vasiliev ◽  
Svetlana Daškevič
Keyword(s):  
Reinforced Concrete ◽  
Protective Layer ◽  
Corrosion Damage ◽  
Steel Reinforcement ◽  
Operating Conditions ◽  
Protective Properties ◽  
Open Atmosphere ◽  
Concrete Elements ◽  
Corrosion State

Based on the results of many research years on concrete carbonisation: both immediately after manufacture (using heat-moisture treatment) and in reinforced concrete elements operated for the periods of various length (in an open atmosphere); the effect of carbonisation on the change in the protective properties of concrete in relation to steel reinforcement; for determination of the dependence of the corrosion state of steel reinforcement on the degree of concrete carbonisation in the area of steel reinforcement; the obtained regression dependences of the change (by time in the cross section) of the degree of concrete carbonisation of various classes in strength, – the analysis of the time of the onset of the boundary values of the degrees of concrete carbonisation (strength classes C12/15–C30/37) for the operating conditions of the open atmosphere was performed. Based on it, the regression dependences of the time variation of the depth of corrosion damage of steel reinforcement were construed (for fixed thicknesses of the concrete protective layer). The obtained nature of dependences made it possible to offer, in a general form, the regression dependences of the depth of corrosion damage and corrosion rate of steel reinforcement for concretes (strength classes C12/15–C30/37) for operating conditions in open atmosphere.

scholarly journals ОЦЕНКА СКОРОСТИ ДЕГРАДАЦИИ ЖЕЛЕЗОБЕТОННЫХ ВОДОПРОПУСКНЫХ ТРУБ

World Science ◽  
2018 ◽  
Vol 2 (7(35)) ◽  
pp. 15-22
Author(s):  
Васильев А. А. ◽  
Дашкевич С. В
Keyword(s):  
Average Rate ◽  
Protective Layer ◽  
Corrosion Damage ◽  
Analytical Form ◽  
Steel Reinforcement ◽  
Design Stage ◽  
Operational Parameters ◽  
Protective Properties ◽  
Formation Of Cracks

Based on a long-term studies and research: the changes of carbonization in time along the cross-section of concrete of various classes in strengths; its effect on the change of the protective properties of concrete in relation to steel reinforcement; the conditions of steel reinforcement and concrete of the protective layer,- the graphical dependences have been obtained, allowing to estimate and predict the depth of corrosion damage of steel reinforcement; the average rate of its corrosion, the time of the onset critical damage to steel reinforcement and the formation of cracks with development of critical width from the thickness of protective layer for concrete of various classes on the strength, which are operated in conditions of open atmosphere.The nature of the dependencies obtained makes it possible to obtain in an analytical form the regression dependencies of the change in corrosion rate of steel reinforcement in carbonized concrete on various technological and operational parameters. That will allow much more objective predictions of the durability of reinforced concrete water pipes (culverts) much more objectively, both at the design stage and during operation.

scholarly journals Protective properties of mechanochemically fabricated zeolite/phosphate anticorrosion pigments for paint coatings

2021 ◽  
pp. 107-112
Author(s):  
S.А. Korniy ◽  
◽  
I.М. Zin ◽  
M.-O.М. Danyliak ◽  
O.P. Khlopyk ◽  
...  
Keyword(s):  
Calcium Phosphates ◽  
Electrochemical Corrosion ◽  
Environmentally Friendly ◽  
Anodic Process ◽  
Protective Film ◽  
Protective Properties ◽  
Inhibitory Components ◽  
Phosphate Pigments ◽  
Gradual Release

The anticorrosion environmentally friendly pigments based on synthetic zeolite and zinc and calcium phosphates were prepared by mechanochemical method. The surface morphology and chemical composition of the obtained pigments were determined by scanning electron microscopy and energy-dispersive X-ray spectroscopy, respectively. It was established that the modification of zeolite by phosphates of divalent metals causes a decrease in the particle size and an increase in the specific surface area of the obtained composite pigments. It was shown that the use of zeolite/phosphate pigments increases the corrosion resistance of the aluminium alloy in 0.1% aqueous NaCl solution. The addition of complex zeolite/phosphate pigments to the sodium chloride solution decelerates the anodic process of electrochemical corrosion, which indicates the formation of a protective film on the metal surface. The composite pigment zeolite/Zn(H2PO4)2 exhibited the highest anticorrosive effect. A gradual release of the inhibitory components from these environmentally friendly pigments provides their long-term action to protect metal products.

scholarly journals RESEARCH OF DYNAMICS OF HYDROGEN SULPHIC CORROSION OF METAL OF CASING UNDER THE LAYER OF MODIFIED CONCRETE

2020 ◽  
Vol 3 (156) ◽  
pp. 49-55
Author(s):  
A. Nemah ◽  
S. Nesterenko ◽  
D. Donskyi ◽  
Yu. Skrypiy
Keyword(s):  
Carbon Dioxide ◽  
Hydrogen Sulfide ◽  
Gas Permeability ◽  
Chloride Ions ◽  
Cement Stone ◽  
Oil Well ◽  
Protective Properties ◽  
Geological Conditions ◽  
Grouting Materials ◽  
Anticorrosion Properties

The issue of protection of problem areas of oil well casings, which are operated in aggressive environments of formation fluids of Iraq, containing hydrogen sulfide, carbon dioxide and chlorides, is considered. It is pro-posed to reduce the influence of aggressive factors by using modified cement compositions. The chemical composi-tion of Portland cements and modified compositions based on them was studied, experimental samples of cement stone were obtained and tested in a simulated aggressive environment (80% CO2 and 20% H2S) at a temperature of 105˚ C for 1200 hours. The dynamics of corrosion development in steel 45 under the cement layer is analyzed. It is shown that the rate of crevice corrosion of casing metal (steel 45), protected by modified concrete, obtained on the basis of Port-land cement grade G is much lower (5-6 times) relative to protection by unmodified concrete, and the protective effect of modified cement stone increases over time. It is concluded that the modification has a positive effect on the protective properties of cement stone. In the process of researching new grouting materials having improved anticorrosion properties, optimal for-mulations of the developed compositions were selected, the dependence of the strength characteristics, adhesion and gas permeability of the stone, as well as its anticorrosion properties on the ratio of components in grouting mixtures were studied. The use of new grouting materials with improved inhibitory properties will help to reduce the risks of prema-ture deformation of the deep sections of the casing string as a result of the corrosion destruction of its external surface, as well as improve the quality of formation demarcation in oil and gas wells with aggressive fluids con-taining hydrogen sulfide, carbon dioxide and a significant amount of dissolved in formation water of chloride ions, has practical value. The results of the work have the prospect of practical application for fastening deep wells, including direc-tional ones, in difficult mining and geological conditions on exploration areas and industrial oil fields of Iraq. Keywords: casing string, formation fluids, hydrogen sulfide, carbon dioxide, chlorides, corrosion, Portland cement, grouting materials, protective properties

scholarly journals Corrosion resistance of stainless steel covered by 4-aminobenzoic acid films

2012 ◽  
Vol 10 (5) ◽  
pp. 1657-1668 ◽  
Author(s):  
Lidia Adamczyk ◽  
Anna Pietrusiak ◽  
Henryk Bala
Keyword(s):  
Electron Microscopy ◽  
Stainless Steel ◽  
Aggressive Medium ◽  
Carbon Electrodes ◽  
Aminobenzoic Acid ◽  
Protective Properties ◽  
Glassy Carbon Electrodes ◽  
Voltammetry Methods ◽  
Scanning Electron ◽  
Anticorrosion Properties

AbstractThe protective, anticorrosion properties of 4-aminobenzoic acid (4-ABA) films are evaluated in the paper. The 4-ABA films were electrodeposited on the surface of both X20Cr13 stainless steel and glassy carbon electrodes by galvanostatically and cyclic voltammetry methods. The protective properties of the resulting films on stainless steel were investigated in the aggressive medium of acidified (pH=4) 0.25 mol dm−3 K2SO4 in the absence and with the presence of 0.5 mol dm−3 KCl. Morphology of the 4-ABA films was examined using scanning electron microscopy.

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