检索结果-南通市图书馆

Corrosion Test of the Steel Plate in a WJ-8 Fastener for High Speed Rail

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Transportation Technologies 2024年第1期14卷 16-30页

作者： Zhiyong Wang Zhiping Zeng Hualiang (Harry) Teng Department of Mechanical Engineering University of Nevada Las Vegas USA School of Civil Engineering Central South University Changsha China Department of Civil and Environmental Engineering and Construction University of Nevada Las Vegas USA

It was found that the steel plate in the composite plate in the WJ-8 fastener used in high speed rail is rusty. The objective of this study is to test the zinc coating of the steel plate. A literature review was conducted to identify the zinc coating techniques, and the companies that can provide different coating service was identified. A salt fog chamber was built that was in compliance with the ANSI B117 code, and the steel plates that were coated by the identified companies were tested using the salt fog chamber. The results indicated that the coating technique that had the best performance in preventing corrosion was the Greenkote plates with passivation. The galvanized option had the roughest coating layer, and it was the most reactive in the salt water solution. This makes it non-ideal for the dynamic rail environment because the increased friction of the plate could damage the supports, especially during extreme temperatures that would cause the rail to expand or contract. Greenkote with Phosphate and ArmorGalv also provided increased corrosion prevention with a smooth, strong finish, but it had more rust on the surface area than the Greenkote with ELU passivation. The ArmorGalv sample had more rust on the surface area than the Greenkote samples. This may not be a weakness in the ArmorGalv process;rather, it likely was the result of this particular sample not having the added protection of a colored coating.

关键词： Steel Plate for High Speed Rail Fastening Steel Corrosion zinc coating Salt-Fog Chamber

The Influence of Microscopic Fungi on Chromated Galvanized zinc coatings

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Engineering（科研） 2010年第12期2卷 979-997页

作者： Albinas Lugauskas Igoris Prosycevas Ausra Selskiene Irina Demcenko Algirdas Narkevicius Dalia Bucinskiene Elena Binkauskiene State Research Institute Center for Physical Sciences and Technology VilniusLithuania Institute of Materials Science Kaunas University of TechnologyKaunasLithuania

A solution containing Cr(VI), Cr(NO3)3 and its complex with an organic acid as well as several commercial solutions containing Cr(III) complexes with an organic acid and additionally CO2+, F-, SO42- ions were used for the studies. Results of the studies obtained in the following commercial solutions: Likonda 2AT, Cr(NO3)3 + malonic acid;Likonda 3Cr5 and Likonda 3CrMC are discussed. Steel coated with chromated Zn coatings was contaminated by some microscopic fungi. The variety of fungi on chromated plates diminished, however the propagules of fungi did not disappear completely. The Likonda 3Cr5 solution diminishes fungi contamination on chromated steel most effectively. In water used to rinse the surface of chromated plates the number of fungi propagules was detected to be higher as compared to that on the plate surface. The least quantity of fungi propagules was detected in water used to rinse plates coated in the Likonda 3Cr5 solution. The main part of fungi detected on chromated plates treated in the Likonda 3Cr5 solution were the fungi of Cladosporium species (***, ***). The latter species also dominated on chromated plates coated with zinc and treated with the other solution. It should be mentioned, that on these plates chromated in this solution, Actinomycetes of the Streptomyces group were abundant. After comparison of surfaces of the plates treated in four solutions it has been determined that the surface of the plates treated in the Likonda 3Cr5 passivation solution and exposed to modelling conditions changed least of all. It has been noticed that on the subject studied white porous rust accumulates, the intensity of this process on the surface studied determines both the probability of corrosion and the resistance of the used safety means to the external factors.

关键词： Steel zinc coating Chromatic Solution Microscopic Fungi Influence

Impacts of zinc layer and pouring method on interface performance for Al-22Si/ZL104 bi-metal

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Foundry 2017年第1期14卷 39-45页

作者： Jun-feng Zhao Fu-yang Cao Jian-fei Sun Xiao-guang Yuan Hong-xian Shen Xin-yi Zhao School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110178China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China

Bi-metal material consisting of spray-formed Al-22Si and ZL104 is a suitable candidate for applications in internal combustion engines. This research investigated the effects of surface treatment and appropriate gating system on the microstructures and mechanical properties in evaluating the optimal strategy for producing high quality bi-metal materials. The bi-metal materials were prepared using ZL104 gravity casting by different pouring types around the spray-formed AI-22Si with varied surface treatments. The wettability between AI-22Si and ZL104 was significantly improved when Zn coating was used to remove the natural oxide layer. This research also obtained the improved interfacial microstructures and interracial bonding strength for materials when applying the appropriate pouring method. The hardness profiles of AI-22Si/ZL104 bi-metal were consistent with the observed microstructures. The average tensile strength of the bi-metal material with zinc coating is -42.3 MPa, which is much higher than that with oxide film at -10 MPa. The process presented is a promising and effective approach for developing materials in the automotive industry.

关键词： bi-metal AI alloy interface bonding zinc coating

Influencing mechanism of pre-existing nanoscale Al5Fe2 phase on Mg-Fe interface in friction stir spot welded Al-free ZK60-Q235 joint

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2020年第7期42卷 220-228页

作者： R.Z.Xu Q.Yang D.R.Ni B.L.Xiao C.Z.Liu Z.Y.Ma Institute of Metal Research Chinese Academy of SciencesShenyang110016China College of Material Science and Engineering Shenyang Aerospace UniversityShenyang110136China Department of Materials Science and Engineering University of Illinois at Urbana-Champaign1304 W Green StUrbanaIL61801United States Fredrick Seitz Materials Research Laboratory University of Illinois at Urbana-Champaign104 S Goodwin AveUrbanaIL61801United States

Al-free ZK60 magnesium (Mg) alloy sheet was selected as substrate material of Mg-steel pinless friction stir spot welding (FSSW), avoiding the effect of the Al element in the substrate on the alloying reaction of Mg-iron (Fe) interface. The sound FSSW joint of ZK60 Mg alloy and Q235 steel with a hot-dipped aluminum (Al)-containing zinc (Zn) coating was successfully realized. The detailed microstructural examinations proved that Al5Fe2 phase at the Mg-Fe interface came from the pre-existing Al5Fe2 phase in the coating and acted as the transition layer for promoting the metallurgical bonding of Mg and Fe. The interfaces with well-matched lattice sites among Fe, Al5Fe2 and Mg were formed during FSSW. A low energy interface with good match of lattice sites ((002)Al5Fe2//(110)Fe, [110]Al5Fe2//[113]Fe) between Al5Fe2 and Fe was identified. For the interface between Al5Fe2 and Mg, an orientation relationship of (622)Al5Fe2//(3112)Mgand[158]Al5Fe2//[2423]Mg was observed. The tensile-shear load of the ZK60-steel joint could reach 4.6 kN. Moreover, the joint fracture occurred at the interface between the Al5Fe2 layer and the Mg alloy substrate, suggesting the brittle fracture characteristic.

关键词： Dissimilar welding Friction stir spot welding Magnesium alloys Steels zinc coating

Evolution of real area of contact due to combined normal load and sub-surface straining in sheet metal

在线全文

学校读者我要写书评

暂无评论

Friction 2021年第4期9卷 840-855页

作者： Meghshyam SHISODE Javad HAZRAT Tanmaya MISHRA Matthijn DE ROOIJ Ton VAN DEN BOOGAAED Nonlinear Solid Mechanics Faculty of Engineering TechnologyUniversity of TwenteEnschede 7522 NBThe Netherlands Surface Technology and Tribology Faculty of Engineering TechnologyUniversity of TwenteEnschede 7522 NBThe Netherlands

Understanding asperity flattening is vital for a reliable macro-scale modeling of friction and *** sheet metal forming processes,sheet surface asperities are deformed due to contact forces between the tools and the *** addition,as the sheet metal is strained while retaining the normal load,the asperity deformation increases *** of the asperities determines the real area of contact which influences the friction and wear at the tool-sheet metal *** real area of contact between two contacting rough surfaces depends on type of loading,material behavior,and topography of the contacting *** this study,an experimental setup is developed to investigate the effect of a combined normal load and sub-surface strain on real area of *** and zinc coated steel sheets(GI)with different coating thicknesses,surface topographies,and substrate materials are used in the experimental *** element(FE)analyses are performed on measured surface profiles to further analyze the behavior observed in the experiments and to understand the effect of surface topography,and coating thickness on the evolution of the real area of ***,an analytical model is presented to determine the real area contact under combined normal load and sub-surface *** results show that accounting for combined normal load and sub-surface straining effects is necessary for accurate predictions of the real area of contact.

关键词： asperity flattening real area of contact sub-surface strain zinc coating sheet metal forming

CeO_2/Zn NANOCOMPOSITE coating BY ELECTRODEPOSITION

在线全文

学校读者我要写书评

暂无评论

Transactions of Nanjing University of Aeronautics and Astronautics 2002年第2期19卷 161-165页

作者：骆心怡何建平李顺林南京航空航天大学材料科学与技术学院南京210016

The nanocomposite coating is obtained by electrochemical deposition of the zinc plating solution with ceria nanoparticles (mean diameter 30 nm). The effect of ceria nanoparticles on the electrodeposited zinc coating is stu died by weight loss test, inductively copuled plasma quantometer (ICP), scanning electron microscopy (SEM) and X ray diffraction (XRD), respectively. It is found that under the same electrodeposition conditions, the corrosion resistance of the nanocomposite coating increases obviously while that of the micron composite coating only improves slightly; The ceria content of the nanocomposite coating is more than that of the micron composite coating. Ceria nanoparticles modify the surface morphology and crystal structure of the zinc matrix in correlation with the increase of corrosion resistance.

关键词： composite electrodeposition ceria nanoparticles nanocomposite coating corrosion resistance zinc coating