Study, improvement and evaluation of electro-corrosion resistance of highly effective inhibitory compositions

2021 ◽  
pp. 54-61
Author(s):  
I. E. Illarionov ◽  
Sh. V. Sadetdinov ◽  
V. N. Gadalov ◽  
O. M. Gubanov ◽  
Yu. V. Skripkina
Keyword(s):  
Materials Science ◽  
Ionization Rate ◽  
Scientific Basis ◽  
Cyclic Strength ◽  
Fatigue Tests ◽  
Passive State ◽  
Full Description ◽  
Corrosive Media ◽  
Physical And Chemical ◽  
Nitrogen Containing Compounds

The studies on the improvement of boron nitrogen-containing compounds, as well as information on phase transformations in the system H3BO3-C3H4N2-H2O, based on the solubility isotherms consisting of three branches, are presented. Based on the analysis of the second branch, a new boratimidazole compound was found. A full description of its properties is given. Furthermore, the paper presents the studies on the effect of boratimidazole and emidazole on the corrosive electrolytic behavior and the main characteristics of the cyclic strength of pre-eutectoid carbon steel in neutral media. It is found that the introduction of emidazole and boratimidazole into corrosive media reduces the ionization rate of steel, reduces the density of the anode current in the passive state region and increases the main characteristics of the cyclic strength of the metal. It has been shown that emidazole has a lower inhibitory ability than boratimidazole. The obtained experimental results of gravimetric studies, electrochemical changes and corrosion-fatigue tests are in good agreement with each other and with the previously obtained data. Boratimidazole is a quite effective corrosion inhibitor and can be used to protect ferrous metals and their alloys. The development of new effective, environmentally friendly corrosion inhibitors based on boron-containing compounds is an important scientific and technical task. To develop new compositions of anticorrosive reagents, the method of physical and chemical analysis, which is the scientific basis of modern materials science, is used in this work.

Increasing the corrosion resistance of carbon steel by means of dipinaconborate compounds

2020 ◽  
pp. 40-45
Author(s):  
Sh. V. Sadetdinov ◽  
◽  
D. A. Pestryaev ◽  
L. Sh. Pestryaeva ◽  
I. V. Fadeev ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Sodium Chloride ◽  
Cyclic Strength ◽  
Fatigue Tests ◽  
Passive State ◽  
Nacl Solution ◽  
Stationary Potential ◽  
Destructive Effect ◽  
Degree Of Protection ◽  
Sodium And Potassium

For the first time, the corrosion resistance of ST10 steel in a 3% NaCl solution in the presence of lithium dipynaconborates (DPBL), sodium (DPBN) and potassium (DPBK) was studied. The method of synthesis of these dipinaconborates is given and their physical and chemical characteristics are determined. Experiments on the measurement of stationary potential high resistance voltmeter potentiostat P-5848 shown that the introduction of dipingere lithium, sodium and potassium in 3% NaCl solution leads to a noticeable increase of the corrosion resistance of steel and pestiviruses action definecolor are in a row DPBC > DPPN > DPBL. According to the obtained data of anodic polarization in a 3% aqueous solution of NaCl, the steel is actively dissolved, and when 0.1 mol/l is added, THE steel passes into a passive state. The increase in the corrosion resistance of steel is explained by the formation of a dense passive ferrohydroxoborate film on the metal surface. Gravimetric studies with the determination of the average corrosion rate, braking coefficient and degree of protection of steel St. 10 in a 3% solution of NaCl with the addition of dipineaconborates of lithium, sodium and potassium of various concentrations found that the concentration of 0.5% is optimal for them. Fatigue and corrosion-fatigue tests of ST10 steel in a solution of sodium chloride without additives and with the addition of DPBK, DPBN, DPBL showed that dipinaconborates equally reduce the destructive effect of purely corrosive and corrosion-mechanical lesions. When the content of 0.5% of potassium dipineaconborate in a solution of sodium chloride, the cyclic strength of steel increases, which is associated with a decrease in the destructive factors in reducing the cyclic strength of steel under the effect of DPBK.

X-ray mapping without STEM

1994 ◽  
Vol 52 ◽  
pp. 508-509
Author(s):  
Judith M. Brock ◽  
Max T. Otten
Keyword(s):  
Life Science ◽  
Materials Science ◽  
Chemical Elements ◽  
Full Description ◽  
Scanning System ◽  
Elemental Distribution ◽  
X Ray ◽  
Transmission Electron ◽  
Distribution Of Elements ◽  
Made In

A knowledge of the distribution of chemical elements in a specimen is often highly useful. In materials science specimens features such as grain boundaries and precipitates generally force a certain order on mental distribution, so that a single profile away from the boundary or precipitate gives a full description of all relevant data. No such simplicity can be assumed in life science specimens, where elements can occur various combinations and in different concentrations in tissue. In the latter case a two-dimensional elemental-distribution image is required to describe the material adequately. X-ray mapping provides such of the distribution of elements.The big disadvantage of x-ray mapping hitherto has been one requirement: the transmission electron microscope must have the scanning function. In cases where the STEM functionality – to record scanning images using a variety of STEM detectors – is not used, but only x-ray mapping is intended, a significant investment must still be made in the scanning system: electronics that drive the beam, detectors for generating the scanning images, and monitors for displaying and recording the images.

scholarly journals Experimental study on fatigue performance of Q420qD high-performance steel cross joint in complex environment

2021 ◽  
Author(s):  
Haigen Cheng ◽  
Cong Hu ◽  
Yong Jiang
Keyword(s):  
Fatigue Life ◽  
High Performance ◽  
Steel Structure ◽  
Steel Structures ◽  
Fatigue Tests ◽  
Fatigue Performance ◽  
Corrosive Media ◽  
Joint Connection ◽  
High Performance Steel ◽  
The Cross

AbstractThe steel structure under the action of alternating load for a long time is prone to fatigue failure and affects the safety of the engineering structure. For steel structures in complex environments such as corrosive media and fires, the remaining fatigue life is more difficult to predict theoretically. To this end, the article carried out fatigue tests on Q420qD high-performance steel cross joints under three different working conditions, established a 95% survival rate $$S{ - }N$$ S - N curves, and analyzed the effects of corrosive media and high fire temperatures on its fatigue performance. And refer to the current specifications to evaluate its fatigue performance. The results show that the fatigue performance of the cross joint connection is reduced under the influence of corrosive medium, and the fatigue performance of the cross joint connection is improved under the high temperature of fire. When the number of cycles is more than 200,000 times, the design curves of EN code, GBJ code, and GB code can better predict the fatigue life of cross joints without treatment, only corrosion treatment, and corrosion and fire treatment, and all have sufficient safety reserve.

Targeted Alternation in Properties of Solid Amorphous-Nanocrystalline Material in Exposing to Nanosecond Laser Radiation

2021 ◽  
Vol 410 ◽  
pp. 469-474
Author(s):  
Ivan S. Safronov ◽  
Alexander I. Ushakov
Keyword(s):  
Laser Radiation ◽  
Physical Properties ◽  
Materials Science ◽  
Chemical Properties ◽  
High Energy ◽  
Strength Properties ◽  
Nanosecond Laser ◽  
Processing Modes ◽  
Traditional Processing ◽  
Physical And Chemical

One of the most important purposes of materials science is the ability to govern the physical properties of materials characterized by different structures. The strength properties of nanostructured metal alloys do not always meet the exploitation requirements. The set of properties of such materials is stable within narrow limits: temperature, mechanical, and corrosion conditions. Traditional processing modes are ineffective for such materials. Attempts to use them often lead to the loss of unique physical and chemical properties. The most effective methods of processing such materials are associated with the use of laser radiation. The laser pulse has a number of features, including a complex effect on the surface layers of the material. Spot and short irradiation with high-energy rays can preserve the unique physical properties of samples as a whole and improve strength indicators without destroying the structure of the material as a whole.

scholarly journals ROLE OF NANOTECHNOLOGY IN DENTAL SCIENCES: A REVIEW

2020 ◽  
Vol 4 (3) ◽  
Author(s):  
Ramakoteswara Rao N ◽  
Kranthi kiran Reddy E ◽  
Leena Gahane ◽  
SV Ranganayakulu
Keyword(s):  
Materials Science ◽  
Biological Properties ◽  
Synthesis Methods ◽  
Nano Technology ◽  
New Science ◽  
Physical Chemical ◽  
Health Related ◽  
Nano Science ◽  
Physical And Chemical

Nano technology is the multi disciplinary science and technology, which has emerged as new science exploiting specific phenomena and direct manipulation of materials on nanoscale. Nanotechnology deals with the physical, chemical, and biological properties of structures and their parts at nanoscale dimensions. It's established on the concept by creating functional structures by controlling corpuscles and molecules on a one-by-one basis by different physical and chemical synthesis methods. Developments in materials science and, nano biotechnology is especially forestalled to provide elevates in dental sciences and initiations in oral health-related diagnostic and therapeutical methods. Keywords: Nano Science, dentistry, Nanocomposite, Nanorobots, Nanomaterials.

scholarly journals Basic Materials Studies of Lanthanide Halide Scintillators

2007 ◽  
Vol 1038 ◽  
Author(s):  
F. P. Doty ◽  
Douglas McGregor ◽  
Mark Harrison ◽  
Kip Findley ◽  
Raulf Polichar ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Materials Science ◽  
Low Cost ◽  
Large Diameter ◽  
Scale Up ◽  
Chemical Properties ◽  
Anisotropic Plasticity ◽  
Ongoing Work ◽  
Perfect Cleavage ◽  
Physical And Chemical

AbstractCerium and lanthanum tribromides and trichlorides form isomorphous alloys with the hexagonal UCl3 type structure, and have been shown to exhibit high luminosity and proportional response, making them attractive alternatives for room temperature gamma ray spectroscopy. However the fundamental physical and chemical properties of this system introduce challenges for material processing, scale-up, and detector fabrication. In particular, low fracture stress and perfect cleavage along prismatic planes cause profuse cracking during and after crystal growth, impeding efforts to scale this system for production of low cost, large diameter spectrometers. We have reported progress on basic materials science of the lanthanide halides. Studies to date have included thermomechanical and thermogravimetric analyses, hygroscopicity, yield strength, and fracture toughness. The observed mechanical properties pose challenging problems for material production and post processing; therefore, understanding mechanical behavior is key to fabricating large single crystals, and engineering of robust detectors and systems. Analysis of the symmetry and crystal structure of this system, including identification of densely-packed and electrically neutral planes with slip and cleavage, and comparison of relative formation and propagation energies for proposed slip systems, suggest possible mechanisms for deformation and crack initiation under stress. The low c/a ratio and low symmetry relative to traditional scintillators indicate limited and highly anisotropic plasticity cause redistribution of residual process stress to cleavage planes, initiating fracture. Ongoing work to develop fracture resistant lanthanide halides is presented.

Destruction Patterns of X70 Steel Sample, Possessing Cracks of Corrosion-Mechanical Origin, under Cyclic Loading

2019 ◽  
Vol 946 ◽  
pp. 20-24 ◽  
Author(s):  
O.A. Nasibullina ◽  
A.G. Gareev
Keyword(s):  
Steel Sample ◽  
Fatigue Tests ◽  
Relaxation Processes ◽  
Corrosive Media ◽  
Mechanical Destruction ◽  
Metal Structures ◽  
Gradual Accumulation ◽  
Accumulation Of Damage ◽  
Machine Parts ◽  
Focal Zone

Most of the structures, parts of machines in the process of operation are subjected to the action of cyclically changing loads, such changes can be judged by the fatigue of the metal. In addition to the influence of mechanical stresses during the service, corrosive environment affects metal structures, machine parts, which leads to the process of gradual accumulation of damage. Corrosive media leads to a decrease in durability. The paper presents results of fatigue tests on a sample of steel X70, selected from the focal zone of destruction of the main gas pipeline. The sample under investigation had numerous cracks typical for corrosion-mechanical destruction. It is shown that with an increase in the number of loading cycles, the electrode potential of the metal decreases, which leads to a decrease in its thermodynamic stability. With the growth of the crack, there is a decrease in the potential, which is not compensated by the relaxation processes. Results of the regression analysis showed that the correlation coefficient is r = 0.99, using the three-parameter logarithmic function.

scholarly journals Evolution and Structure of the Scientific Basis for Nuclear Waste Management

MRS Advances ◽  
2018 ◽  
Vol 4 (17-18) ◽  
pp. 959-964 ◽  
Author(s):  
François Diaz-Maurin ◽  
Hilary C. Sun ◽  
Jerold Yu ◽  
Rodney C. Ewing
Keyword(s):  
Waste Management ◽  
Nuclear Waste ◽  
Materials Science ◽  
Fuel Cycle ◽  
Scientific Basis ◽  
Health Science ◽  
Nuclear Waste Management ◽  
Relative Decline ◽  
Effects Of Radiation ◽  
The Individual

ABSTRACTThe final disposal of nuclear waste is at the interface between the technologies of the nuclear fuel cycle that produce the waste and the natural hydrologic and geochemical cycles of geologic repositories. Despite this broad interdisciplinary scope, nuclear waste management, as practiced, remains “balkanized” among the relevant disciplines. The individual subdisciplines continue to work in relative isolation from one another: materials science dealing with the immobilization of nuclear waste; engineering science dealing with the design, construction and operation of the repository; geoscience dealing with the long-term behavior of host rocks and the hydrology; health science dealing with the effects of radiation; social sciences dealing with the issues of trust, risk and ethics. Understanding how these very different disciplines interact is fundamental to creating and managing a nuclear waste organization. Based on a comprehensive review of the scholarly and scientific literature of waste management, we have analyzed the evolution and structure of research in nuclear waste management between 1979 and 2017. Focusing on materials science, we show that some research themes have been isolated from the most central themes of nuclear waste management. Moreover, we observed a relative decline of the fundamental research in materials science. This decline was evidenced by a drop in the number of articles published in the proceedings of the MRS symposia “Scientific Basis for Nuclear Waste Management” since 2000. We argue for the need to more precisely and inclusively define the field of nuclear waste management.

Failure Process and Mechanism Analysis for the Connecting Rod of Diesel Engine

2012 ◽  
Vol 463-464 ◽  
pp. 1597-1600
Author(s):  
Ying Kui Gu ◽  
Kang Hu ◽  
Jing Li
Keyword(s):  
Diesel Engine ◽  
Material Properties ◽  
Treatment Process ◽  
Failure Process ◽  
Organization Structure ◽  
Scientific Basis ◽  
Mechanism Analysis ◽  
Connecting Rod ◽  
Fault Mechanism ◽  
Physical And Chemical

The operational fault of diesel engine caused by losing the required function in running is a random phenomenon. It needs to collect a large number of fault samples and reliability data to reveal the fault occurrence rule and describe it with mathematical method. In this paper, the fault law and mechanism of the engine connecting rod were researched by the physical and chemical analysis of the fault samples. The fault reasons and the fault mechanism can be found through the analysis of the organization structure, material properties, process features, heat treatment process and other reliability information of the fault sample. It can provide scientific basis for the failure exclusion as well as the optimization and improvement of connecting rod structure.

Technical ceramics: material science and technology principles and mechanisms for the development and implementation of ceramic electrical insulators for various scientific and practical purposes

2020 ◽  
pp. 16-24
Author(s):  
O. V. Roman ◽  
V. T. Shmuradko ◽  
F. I. Panteleenko ◽  
O. P. Reut ◽  
T. I. Bendik ◽  
...  
Keyword(s):  
Materials Science ◽  
Electron Beam Welding ◽  
Raw Materials ◽  
High Strength ◽  
Technical Ceramics ◽  
Copper Aluminum ◽  
Scientific Practical ◽  
Electrical Insulation Materials ◽  
Electrical Materials ◽  
Physical And Chemical

The concept of creating electrical insulating ceramic materialsproducts from powder systems representing oxide and nonoxide chemical compounds was formed; a program document for materials science and technological logistics of physical and chemical transformation of technogenic mineral raw materials into electrical materials-products of various scientific, practical and specific technological purposes was created and implemented. The principal theoretical approach and its appliedpractical aspects of the development - research - creation of thermo- and chemically resistant structural electrical insulation materials - products for various scientific and practical purposes: automatic contact welding of tubular bimetals (for example, copper - aluminum), electron beam welding in vacuum of thickwalled large-sized structures made of high-strength aluminum alloys, high-temperature (1050 oC) hardening of drilling tools in vacuum furnaces in the medium of dissociated acetylene are considered, in electric transmissions of brake installations of quarry dump trucks (k/s) BelAZ.

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