Defect and Diffusion Forum最新文献_第6页

Copper, Iron and Aluminium Electrochemical Corrosion Investigation during Electrolysis and Temperature Increasing 电解和升温过程中铜、铁和铝的电化学腐蚀研究

Defect and Diffusion Forum Pub Date : 2023-12-12 DOI: 10.4028/p-5pUGB3

M. Yarmolenko, Sergii O. Mogilei

{"title":"Copper, Iron and Aluminium Electrochemical Corrosion Investigation during Electrolysis and Temperature Increasing","authors":"M. Yarmolenko, Sergii O. Mogilei","doi":"10.4028/p-5pUGB3","DOIUrl":"https://doi.org/10.4028/p-5pUGB3","url":null,"abstract":"An experimental method to calculate average charge of metal ions by electrolysis at different temperatures is proposed. Aluminium undergoes dissolution to the Al3+ ions at all temperatures. Iron undergoes dissolution to the Fe2+ or the Fe3+ ions and copper undergoes dissolution to the Cu+ or the Cu2+. It depends on temperature and electric current density. Direct electric current value and anode mass decreasing were measured during electrolysis into concentrated NaCl solution in water (5 mol/kg or 23.1%, freezing point equals -22°C, pH 6.5–7.5) at room temperature and 100°C. The average charges of copper, iron, and aluminium ions were calculated using Faraday’s law of electrolysis at electric current density 3,000 A/m2 (or 30 A/dm2): +3 for aluminium; +2 for iron; and +1 for copper at room temperature, and +3 for aluminium; +2 for iron; and +1.5 for copper at temperature 100°C. The main condition was zAl=3. We concluded that calculations of the average metal ions charges, zFe and zCu, were correct since zAl=3. The result is as follows: the Al3+, the Fe2+, and the Cu+ ions dissolve into concentrated NaCl solution in water at room temperature; the Al3+, the Fe2+, the Cu+ and the Cu2+ ions (50%/50%) dissolve into the solution at temperature 100°C. We have obtained experimentally and by mathematical modelling that aluminium anodes (cylindrical or spherical) dissolve into the solution more rapidly with temperature increasing during electrolysis accordingly to the Arrhenius law, while copper anodes (cylindrical or spherical) dissolve more slowly with temperature increasing from room temperature to temperature 180°C like “inverse Arrhenius law”. Iron electrochemical corrosion rate practically does not depend on temperature below 100°C (and, obviously, up to 180°C) like “zeroth Arrhenius law”. The spherical anode effect is greater than the cylindrical anode effect in 1.5 times.","PeriodicalId":11306,"journal":{"name":"Defect and Diffusion Forum","volume":"43 24","pages":"93 - 106"},"PeriodicalIF":0.0,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139007744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of Fe-Cr Coating on the Fe-Ga Alloy Functional Properties 铁-铬涂层对铁-镓合金功能特性的影响

Defect and Diffusion Forum Pub Date : 2023-12-12 DOI: 10.4028/p-mbK4cO

V. Palacheva, V. Cheverikin, D.G. Chubov, Mikhail Yu. Zadorozhnyy, Yulia S. Zhukova, A. Sheveyko, Alexey N. Solonin, Philipp V. Kiryukhantsev-Korneev, I.S. Golovin

引用次数: 0

Development of a 3D Computer Simulation Model Using C++ Methods 用c++方法开发三维计算机仿真模型

Defect and Diffusion Forum Pub Date : 2023-08-22 DOI: 10.4028/p-5iWtnL

V. Pasternak, A. Ruban, V. Shvedun, Julia Veretennikova

{"title":"Development of a 3D Computer Simulation Model Using C++ Methods","authors":"V. Pasternak, A. Ruban, V. Shvedun, Julia Veretennikova","doi":"10.4028/p-5iWtnL","DOIUrl":"https://doi.org/10.4028/p-5iWtnL","url":null,"abstract":"The article presents modelling of spherical elements based on the developed computer model. We recorded the main combinations of spherical particles during filling, which are formed in the hopper. It was found that the most likely combination that occurs when modelling spherical elements consists of three balls. It should be noted that in the cross-section of such a combination passing through the center of the balls, an equilateral triangle is formed. And in the cross-section of the structure, which consists of four spherical balls, a rhombus is formed, if you connect the centers of these spherical elements. It is worth noting that from this formed combination of spherical elements, it can be seen that the rhombus forms two smaller equilateral triangles that fix the process of pushing the spherical balls apart. In turn, the process of pushing spherical elements apart made it possible to fix the contact between spherical elements, as well as to state the stable position of each (individual) particle. This paper also presents the main fragments of encoding the source text of a 3D computer model for modelling spherical elements, which made it possible to optimize the model parameters. It was found that from the obtained data on the distribution of coordination numbers for different volume fillings of spherical elements, it follows that the largest filling was 72 %, which corresponds to the state when 112 lobules have an average coordination number of 3,92.","PeriodicalId":11306,"journal":{"name":"Defect and Diffusion Forum","volume":"428 1","pages":"57 - 66"},"PeriodicalIF":0.0,"publicationDate":"2023-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47757496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Effect of Silica Powder Based on Methyltrimethoxysilane and Silica Sand as a Hydrophobic Material 基于甲基三甲氧基硅烷的二氧化硅粉末和硅砂作为疏水材料的效果

Defect and Diffusion Forum Pub Date : 2023-08-22 DOI: 10.4028/p-agJQ6S

Yuniar Mughayyirah, L. Silvia, M. Zainuri

{"title":"The Effect of Silica Powder Based on Methyltrimethoxysilane and Silica Sand as a Hydrophobic Material","authors":"Yuniar Mughayyirah, L. Silvia, M. Zainuri","doi":"10.4028/p-agJQ6S","DOIUrl":"https://doi.org/10.4028/p-agJQ6S","url":null,"abstract":"In this research, a hydrophobic surface has been successfully created using a mixture of silica sand and methyltrimethoxysilane (MTMS) precursor. This research aims to determine the effect of varying the volume of MTMS on the hydrophobic surface. The MTMS as silica precursor was synthesized with Stöber method. The variation used is the volume of the MTMS precursor, while the silica from silica sand is made constant. The volume variation of the MTMS precursor is 9.5 ml, 19 ml, 28.5 ml and 38 ml. The MTMS/SiO2 composite which has been synthesized then get mixed with steel ship paint and coated on the steel plate surface as a topcoat. The MTMS/SiO2 composite was further characterized by X-ray Powder Diffraction (XRD), Scanning Electron Microscopy (SEM), Water Contact Angle (WCA), and Atomic Force Microscope (AFM) which were employed to investigate crystal structure, morphology of particle, hydrophobicity on a surface, and topography of the three-dimensional surface layer respectively. The type of liquid used in the WCA characterization is seawater. XRD characterization results show that silica sand has a quartz phase, MTMS has an amorphous phase and MTMS/SiO2 composite tends to have an amorphous phase. SEM characterization show that the particle size of silica sand that has been mixed with MTMS is around 8 – 20 μm. WCA characterization show that the addition of silica powder on the topcoat increase surface roughness and WCA, so that the steel plate surface has good hydrophobic properties. The highest water contact angle obtained in this research was 109o by seawater.","PeriodicalId":11306,"journal":{"name":"Defect and Diffusion Forum","volume":"428 1","pages":"75 - 80"},"PeriodicalIF":0.0,"publicationDate":"2023-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43435662","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of In-Plane Stress on the Frictional Behavior of Thin Layers 面内应力对薄层摩擦行为的影响

Defect and Diffusion Forum Pub Date : 2023-08-22 DOI: 10.4028/p-n2JBjr

N. Menga, G. Carbone

引用次数: 0

Unbound Excitonic Properties in a Multilayered Quantum Dot under Hydrostatic Pressure and Temperature 静水压力和温度下多层量子点的非束缚激子性质

Defect and Diffusion Forum Pub Date : 2023-08-22 DOI: 10.4028/p-ufLk2M

M. Hbibi, O. Mommadi, S. Chouef, R. Boussetta, M. Chnafi, L. Belamkadem, A. El Moussaouy, C. M. Duque, C. A. Duque, F. Falyouni

引用次数: 0

Viscoelastic Adhesion and Friction in Sliding Contacts 滑动接触中的粘弹性粘附与摩擦

Defect and Diffusion Forum Pub Date : 2023-08-22 DOI: 10.4028/p-840lJl

G. Carbone, N. Menga

引用次数: 0

Quantum Technologies, Defect Identification and Materials Research 量子技术、缺陷识别和材料研究

Defect and Diffusion Forum Pub Date : 2023-08-22 DOI: 10.4028/b-pxan60

Steven Y. Liang, V. Andronov, Y. Otrosh, Abdelaaziz El Moussaouy, Agustinus Agung Nugroho, Chafic-Touma Salame

引用次数: 0

Hierarchical Structure of SiO2 by In Situ Modification Combining Quartz Sand and Methyltrimethoxysilane 石英砂与甲基三甲氧基硅烷原位改性SiO2的层次结构研究

Defect and Diffusion Forum Pub Date : 2023-08-22 DOI: 10.4028/p-2jVrNK

L. Silvia, Lana Awathifi, Yuniar Mughayyirah, M. Zainuri, D. Darminto

{"title":"Hierarchical Structure of SiO2 by In Situ Modification Combining Quartz Sand and Methyltrimethoxysilane","authors":"L. Silvia, Lana Awathifi, Yuniar Mughayyirah, M. Zainuri, D. Darminto","doi":"10.4028/p-2jVrNK","DOIUrl":"https://doi.org/10.4028/p-2jVrNK","url":null,"abstract":"SiO2 were successfully synthesized by sol–gel process via in-situ modification. The SiO2 consists of two kinds of co-precursor namely raw material from quartz sand and methyltrimethoxysilane (MTMS) as main SiO2 source. By introducing SiO2 with different sizes of particle micro-submicron scale, it was suggested to construct hierarchical structure. The sample was characterized by X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM), and Atomic Force Microscope (AFM) to analyze crystal structure, morphology of particles, and surface roughness of the samples. In this research, SiO2 co-precursor from quartz sand were extraction and synthesis to be SiO2 quartz (SQ) phase and SiO2 amorphous (SA) phase respectively which is combine with SiO2 based MTMS by sol–gel process via in-situ modification. Based on the results, it can be concluded that SiO2 with high purity levels maintains its crystal structure even after in-situ modification, resulting in an increase in particle size to approximately 12-20 μm. SEM images showed that particle was irregular shape due to agglomeration which is SiO2 based quartz sand stick by SiO2 based MTMS. AFM showed the surface roughness of MTMS/SQ have a larger roughness than MTMS/SA with Sa 3.3 ± 0.8 nm and Sq 5.0 ± 1.0 nm. The formation of hierarchical structure layers based on SiO2 has a promising potential for wide applications in various fields such as hydrophobic surface.","PeriodicalId":11306,"journal":{"name":"Defect and Diffusion Forum","volume":"428 1","pages":"69 - 74"},"PeriodicalIF":0.0,"publicationDate":"2023-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42255744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synthesization and Photocatalytic Activity Evaluation of Float-Type g-C3N4 Microtubes 漂浮型g-C3N4微管的合成及其光催化活性评价

Defect and Diffusion Forum Pub Date : 2023-08-22 DOI: 10.4028/p-XnUv8Q

K. Nanakida, Dang-Trang Nguyen, K. Taguchi

引用次数: 0