Corrosion Processes of Uranus B6 and Monel 400 Special Alloys in Deep Eutectic Solvents

2019 ◽  
Vol 70 (8) ◽  
pp. 2968-2972
Author(s):  
Elena Ionela Neacsu ◽  
Virgil Constantin ◽  
Cristina Donath ◽  
Kazimir Yanushkevich ◽  
Aliona Zhivulka ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Corrosion Behaviour ◽  
Choline Chloride ◽  
Deep Eutectic Solvents ◽  
Corrosion Process ◽  
Specific Magnetization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Before And After ◽  
Monel 400

The corrosion behaviour of special alloys (Uranus B6 steel and Monel 400) exposed to chlorine chloride-deep eutectic solvents (DES) at 353 K has been investigated by polarization curves method. The corresponding corrosion parameters in choline chloride-oxalic acid and choline chloride-malonic acid were calculated. Micrographic images before and after immersion in the corrosive medium were obtained. Measurements of the influence of the corrosion process on the crystal structure and specific magnetization of the studied steels was carried out by using X-ray diffraction and respectivelly ponderomotive methods.

Corrosion Behavior of Some Steels in Ionic Liquids Based on Choline Chloride

2018 ◽  
Vol 69 (10) ◽  
pp. 2642-2647 ◽  
Author(s):  
Elena Ionela Neacsu ◽  
Virgil Constantin ◽  
Cristina Donath ◽  
Kazimir Yanushkevich ◽  
Aliona Zhivulka ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Corrosion Behaviour ◽  
Choline Chloride ◽  
Diffraction Method ◽  
Corrosion Process ◽  
Specific Magnetization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Before And After ◽  
Special Steels

The corrosion behaviour of special steels (OL44, OL52, SS1.4571) exposed to choline chloride (ChCl) based ionic liquids, has been investigated by polarization curves method at 80�C. Micrographic images before and after corrosion were obtained. The corresponding corrosion parameters in ChCl-Oxalic acid and ChCl-Malonic acid were calculated. The crystal structure was studied before and after the corrosion process by using X-ray diffraction method. The specific magnetization was investigated by ponderomotive method.

Crystal Structure and Colorimetric Behavior of Low Melting Point Ternary Alloy

2020 ◽  
Vol 1002 ◽  
pp. 12-20
Author(s):  
Tarik T. Issa ◽  
Sadeer M. Majeed ◽  
Duha S. Ahmed
Keyword(s):  
Crystal Structure ◽  
Melting Point ◽  
Mechanical Alloying ◽  
Ternary Alloy ◽  
High Purity ◽  
Milling Time ◽  
X Ray Diffraction ◽  
X Ray ◽  
Before And After

Elements of high purity (99.999) ,were used to prepare the alloy , Bi ,Sn,Zn and Cu .Two types alloy Bi – Sn – Zn and Bi – Sn – Cu were prepared by mechanical alloying technique (MA) .Annealing at 100 °Cfor 8 hours was applied for the resulting alloys . X-ray diffraction and differential scanning colorimetriy were tested for the two types of alloy before and after annealing. The best results was noticed in the ternary alloythat prepared at 4 hours milling time ,and annelid at 100 °C, for 8 hours ,under static air.

scholarly journals Thermolysis of sprayed suspensions for obtaining highly spinel ferrite nanoparticles

2019 ◽  
pp. 14-21
Author(s):  
Elena G. Petrova ◽  
Yana A. Shavshukova ◽  
Dzmitry A. Kotsikau ◽  
Kazimir I. Yanushkevich ◽  
Konstantin V. Laznev ◽  
...  
Keyword(s):  
Annealing Temperature ◽  
Spinel Ferrite ◽  
Ferrite Nanoparticles ◽  
Specific Magnetization ◽  
X Ray Diffraction ◽  
Crystallinity Degree ◽  
Insulating Layer ◽  
X Ray ◽  
Transmission Electron ◽  
Before And After

Thermal treatment of ferrite magnetic nanoparticles in NaCl matrix gives an opportunity to increase their specific magnetization with preservation of nanoscale size. Composite materials based on mixed ferrites Co0.65Zn0.35Fe2O4 and Mg 0.5Zn0.5Fe2O4 were synthesized by spray-drying of aqueous suspensions in presence of NaCl and annealed at 300 –900 °C. The microstructure and phase composition of nanoparticles before and after annealing were studied by scanning and transmission electron microscopy (SEM and TEM), X-ray diffraction analysis and IR spectroscopy. The magnetic properties of nanoparticles were estimated using a ponderomotive method of measuring the specific magneti zation at room temperature in a magnetic field with an induction of 0.86 T. The increase of the annealing temperature up to 900 °C was established to lead to the increase in the specific magnetization of ferrites – from 32.79 to 91.3 emu/g (Co0.65Zn0.35Fe2O4) and from 2.76 to 22.31 emu/g (Mg 0.5 Zn 0.5Fe2O4) due to recrystallization processes and increase of crystallinity degree of the ferrites. Due to the NaCl insulating layer, the particle size increases just slightly (from ~ 10 nm before annealing to ~ 60 nm after annealing at 900 °C). This method is effective for substantial increase in specific magnetization of ferrite nanoparticles with preservation of their nanoscale size.

scholarly journals Zinc containing borate glasses and glass-ceramics: Search for biomedical applications

2014 ◽  
Vol 8 (4) ◽  
pp. 185-193 ◽  
Author(s):  
Amr Abdelghany ◽  
Fatema Elbatal ◽  
Hatem Elbatal
Keyword(s):  
Glass Ceramic ◽  
Corrosion Behaviour ◽  
Glass Ceramics ◽  
Soda Lime ◽  
Dissolution Mechanism ◽  
Borate Glasses ◽  
X Ray Diffraction ◽  
X Ray ◽  
Before And After ◽  
Diffraction Patterns

Ternary soda lime borate glass and samples with ZnO replacing CaO up to 10mol%were prepared and studied for their bone bonding ability. Fourier transform infrared (FTIR) absorption spectra of the prepared glasses before and after immersion in simulated body fluid (SBF), for one or two weeks, showed the appearance of calcium phosphate (hydroxyapatite (HA)) which is an indication of bone bonding ability. X-ray diffraction patterns were measured for the glasses and indicated the presence of small peaks related to hydroxyapatite in the samples immersed in SBF. The glasses were heat treated with controlled two-step regime to convert them to their corresponding glass-ceramic derivatives. FTIR and X-ray diffraction measurements of the glass-ceramic samples (before and after immersion in SBF) confirmed the appearance of HA which is influenced by ZnO content. The overall data are explained on the basis of current views about the corrosion behaviour of borate glasses including hydrolysis and direct dissolution mechanism.

scholarly journals Hemisynthesis, crystal structure and inhibitory effect of sesquiterpenic thiosemicarbazones and thiazolidin-4-ones on the corrosion behaviour of stainless steel in 1 M H2SO4 solution

2019 ◽  
Vol 75 (6) ◽  
pp. 623-632 ◽  
Author(s):  
Abdoullah Bimoussa ◽  
Yassine Koumya ◽  
Abdesselam Abouelfida ◽  
Moulay Youssef Ait Itto ◽  
Abdelaziz Benyaich ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Corrosion Behaviour ◽  
Steel Corrosion ◽  
Inhibitory Effect ◽  
Maximum Efficiency ◽  
Boat Conformation ◽  
X Ray Diffraction ◽  
Energy Band Gap ◽  
X Ray ◽  
Dispersion Effects

Treatment of thiosemicarbazones prepared from sesquiterpenes with ethyl 2-bromoacetate in the presence of sodium acetate afforded the corresponding thiazolidin-4-ones. The structures of all the newly synthesized compounds were established by considering spectral and single-crystal X-ray diffraction data. The title compound, ethyl 2-((Z)-2-{(Z)-[(1aR,5aR,9aS)-1,1-dichloro-1a,5,5,7-tetramethyl-1a,2,3,4,5,5a,8,9-octahydro-1H-benzo[a]cyclopropa[b][7]annulen-8-ylidene]hydrazono}-4-oxothiazolidin-3-yl)acetate, C23H31Cl2N3O3S, 5, crystallizes in the orthorhombic noncentrosymmetric space group P212121 with Z = 4. Within the molecule in the crystal structure, the cyclohexene ring has an envelope conformation and the cycloheptane ring, to which it is fused, has a boat conformation. In the crystal, molecules are linked by C—H...Cl hydrogen bonds forming chains propagating along the b-axis direction. The absolute configuration of the molecule in the crystal could be fully confirmed from anomalous dispersion effects [Flack parameter = −0.04 (2)]. Thiosemicarbazones 1 and 2 are efficient inhibitors for steel corrosion in 1 M H2SO4 solution, with a maximum efficiency of 92.28% at 10−3 M. Furthermore, thiosemicarbazone compounds were found to be more efficient than thiazolidin-4-one derivatives. In addition, cyclic voltammetry was used to characterize the tested molecules, as well to estimate the experimental value of the energy band gap.

Evaluation of Freezing Methods by Low Temperature X-Ray Diffraction

1977 ◽  
Vol 35 ◽  
pp. 330-333
Author(s):  
T. Gulik-Krzywicki ◽  
M.J. Costello
Keyword(s):  
Biological Materials ◽  
Molecular Organization ◽  
X Ray Diffraction ◽  
Glass Capillary ◽  
X Ray ◽  
Rate Dependent ◽  
Before And After ◽  
Freeze Etching ◽  
Diffraction Patterns ◽  
Set Up

Freeze-etching electron microscopy is currently one of the best methods for studying molecular organization of biological materials. Its application, however, is still limited by our imprecise knowledge about the perturbations of the original organization which may occur during quenching and fracturing of the samples and during the replication of fractured surfaces. Although it is well known that the preservation of the molecular organization of biological materials is critically dependent on the rate of freezing of the samples, little information is presently available concerning the nature and the extent of freezing-rate dependent perturbations of the original organizations. In order to obtain this information, we have developed a method based on the comparison of x-ray diffraction patterns of samples before and after freezing, prior to fracturing and replication.Our experimental set-up is shown in Fig. 1. The sample to be quenched is placed on its holder which is then mounted on a small metal holder (O) fixed on a glass capillary (p), whose position is controlled by a micromanipulator.

Crystal structure of an inclusion complex between chiral monoaza-15-crown-5 and S(–)-1-phenyl-ethyl ammonium percholorate

2003 ◽  
Vol 218 (5) ◽  
Author(s):  
Süheyla Özbey ◽  
F. B. Kaynak ◽  
M. Toğrul ◽  
N. Demirel ◽  
H. Hoşgören
Keyword(s):  
Crystal Structure ◽  
Inclusion Complex ◽  
Single Crystal ◽  
X Ray Diffraction ◽  
Space Group ◽  
X Ray ◽  
New Type

AbstractA new type of inclusion complex, S(–)-1 phenyl ethyl ammonium percholorate complex of R-(–)-2-ethyl - N - benzyl - 4, 7, 10, 13 - tetraoxa -1- azacyclopentadecane, has been prepared and studied by NMR, IR and single crystal X-ray diffraction techniques. The compound crystallizes in space group

Crystal Forms of Semisynthetic Ergot Alkaloid Terguride

2002 ◽  
Vol 67 (4) ◽  
pp. 479-489 ◽  
Author(s):  
Michal Hušák ◽  
Bohumil Kratochvíl ◽  
Ivana Císařová ◽  
Ladislav Cvak ◽  
Alexandr Jegorov ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Ergot Alkaloid ◽  
Simplified Model ◽  
Quantum Mechanical ◽  
Quantum Mechanical Calculations ◽  
X Ray Diffraction ◽  
Torsion Angles ◽  
Crystal Forms ◽  
X Ray ◽  
Independent Molecules

Two new structures of semisynthetic ergot alkaloid terguride created by unusual number of symmetry-independent molecules were determined by X-ray diffraction methods at 150 K. Form A (monoclinic, P212121, Z = 12) contains three symmetry-independent terguride molecules and two molecules of water in the asymmetric part of the unit cell. The form CA (monoclinic, P21, Z = 8) is an anhydrate remarkable by the presence of four symmetry-independent molecules in the crystal structure. Conformations of twelve symmetry-independent molecules that were found in four already described terguride structures are compared with torsion angles obtained by ab initio quantum-mechanical calculations for the simplified model of N-cyclohexyl-N'-diethylurea.

scholarly journals High-pressure synthesis and crystal structure of the mixed-cation borate Ga4In4B15O33(OH)3

2019 ◽  
Vol 74 (4) ◽  
pp. 357-363
Author(s):  
Daniela Vitzthum ◽  
Hubert Huppertz
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
High Temperature ◽  
Diffraction Data ◽  
X Ray Diffraction ◽  
Synthesis And Crystal Structure ◽  
X Ray ◽  
Mixed Cation ◽  
High Pressure High Temperature ◽  
Pressure Synthesis

AbstractThe mixed cation triel borate Ga4In4B15O33(OH)3 was synthesized in a Walker-type multianvil apparatus at high-pressure/high-temperature conditions of 12.5 GPa and 1300°C. Although the product could not be reproduced in further experiments, its crystal structure could be reliably determined via single-crystal X-ray diffraction data. Ga4In4B15O33(OH)3 crystallizes in the tetragonal space group I41/a (origin choice 2) with the lattice parameters a = 11.382(2), c = 15.244(2) Å, and V = 1974.9(4) Å3. The structure of the quaternary triel borate consists of a complex network of BO4 tetrahedra, edge-sharing InO6 octahedra in dinuclear units, and very dense edge-sharing GaO6 octahedra in tetranuclear units.

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