检索结果-南通市图书馆

Journal of Iron and Steel Research(International) 2022年第4期29卷 677-686页

作者： Wei Li Jing-huan Chang Bao-feng Wen Rui Cao State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metal Lanzhou University of TechnologyLanzhou 730050GansuChina Department of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050GansuChina

A galvanized steel is used to join Mg AZ31B alloy and Al A6061-T6 alloy as a joining transition layer by cold metal transfer(CMT)method.Firstly,to optimize the process variables,extensive welding tests were performed by a design of experiment method.Then,microstructures,joining mechanisms and tensile properties were characterized and analyzed.Results indicated that Mg and Al alloys can be joined by using galvanized steel as a joining transition layer and cold metal transfer welding method.The formed joint is called as a Mg–steel–Al CMT joint.By using galvanized steel transition joining layer,Mg–Al brittle intermetallics Al12Mg17 and Al3Mg2 were inhibited.The properties of Mg–steel–Al CMT joints have been improved after optimizing the welding variables.The strength of Mg–steel–Al CMT joint is comparable to those of Al–Al joint and Mg–Mg joint.The strength of Mg–steel–Al CMT joint can reach 100%that of Al–Al joint and Al–steel joint,and reach 90%that of Mg–Mg joint and Mg–steel joint.The optimized Mg–steel–Al CMT welded joint with galvanized steel transition layer is fractured at the heat affected zone of Al base metal rather than at the weld-brazed interface,due to softening of Al base metal.

关键词： Cold metal transfer Mg alloy Al alloy galvanized steel Transition joining layer Dissimilar metal joining

Small-invasive determination of iron content in coating of galvanized steel sheets by laser-induced breakdown spectroscopy

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 Iron and Steel Research(International) 2019年第10期26卷 1137-1146页

作者： Lan-xiang Sun Wei-ye Wang Mei-ting Guo Xue-yong Tian Peng Zhang Li-feng Qi Hai-bin Yu Peng Zeng Shenyang Institute of Automation Chinese Academy of SciencesShenyang 110016LiaoningChina Key Laboratory of Networked Control Systems Chinese Academy of SciencesShenyang 110016LiaoningChina Northeastern University Shenyang 110819LiaoningChina Central Research Institute SIASUN Robot&Automation Co.Ltd.Shenyang 110168LiaoningChina University of the Chinese Academy of Sciences Beijing 100049China

A new method was presented to determine the iron content in the coating of galvanized steel sheet based on laser-induced breakdown spectroscopy.The zinc-iron coating was characterized with a series of single laser pulses irradiated on the traversing sheet steel,each on a different steel sheet position.The influences of laser fluence and elemental depth distribution were studied and analyzed.To protect the corrosion performance of the coating and meet requirements for small-invasive measurement,the ablation size of the crater under different laser fluences was studied.Under the optimized experimental parameters,the diameter of ablation craters is about 50μm,and then,the Fe content in the coating was calibrated and analyzed by the linear standard calibration method.The calibration result,however,is not good.Considering that the Zn content in the coating was high and relatively constant,curve calibration was then carried out with the intensity ratio(IFe404.58/Izn468.01)instead of the net line intensity of Fe,and then,the determination coefficient of calibration curve increases from 0.7713 to 0.9511,and the root-mean-square error decreases from 0.4832%to 0.1509%.The results prove that the laser-induced breakdown spectroscopy is an effective way for the analysis of the Fe content in the coating of galvanized steel sheet.

关键词： Laser-induced breakdown spectroscopy galvanized steel sheet Quantitative analysis Small-invasive analysis Iron content

Corrosion kinetics and patina evolution of galvanized steel in a simulated coastal-industrial atmosphere

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 Materials Science & Technology 2019年第10期35卷 2345-2356页

作者： Chuang Qiao Lianfeng Shen Long Hao Xin Mu Junhua Dong Wei Ke Jing Liu Bo Liu College of Forestry Henan Agricultural UniversityZhengzhou450002China Environmental Corrosion Centre of Materials Institute of Metal ResearchChinese Academy of SciencesShenyang110016China Electric Power Test and Research Institute Guangzhou Power Supply Co.Ltd.(GZPS)Guangzhou510410China School of Metallurgy Northeastern UniversityShenyang110819China

The corrosion kinetics and patina(corrosion products) layer evolution of galvanized steel submitted to wet/dry cyclic corrosion test in a simulated coastal-industrial atmosphere was investigated. The results show that zinc coating has a greater corrosion rate during the initial period and a lower corrosion rate during the subsequent period, and the patina composition and structure can greatly affect the corrosion kinetics evolution of zinc coating. Moreover, Zn5(OH)6(CO3)2 and Zn4(OH)6 SO4 are identified as the main stable composition and exhibit an increasing relative amount;while Zn12(OH)15Cl3(SO4)3 cannot stably exist and diminish in the patina layer as the corrosion develops.

关键词： Zinc galvanized steel EIS Atmospheric corrosion Patina layer

Corrosion Inhibition of galvanized Steel in NaCl Solution by Tolytriazole

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2019年第4期32卷 471-480页

作者： Yanhong Yan Hongwei Shi Jun Wang Fuchun Liu En-Hou Han CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of Sciences Department of Chemistry Northeastern University

Corrosion inhibition of tolytriazole for galvanized steel was studied in 5 mM NaCl by using potentiodynamic polarization and electrochemical impedance spectroscopy(EIS), scanning vibrating electrode technique(SVET). The results of EIS and polarization tests indicate that tolytriazole is effective in corrosion inhibition of galvanized steel. As the concentration of tolytriazole is increased to 0.01 M, the inhibiting efficiency reaches above 98%. The low values of anodie and cathodic current density in SVET maps suggest that the complex of tolytriazole with galvanized steel inhibits the anodic and cathodie reactions of corrosion of zinc. The adsorption behaviour of tolytriazole is found to conform to Langmuir adsorption isotherm, which is typical chemical adsorption.

关键词： Tolytriazole galvanized steel Corrosion inhibition Potentiodynamic curves Electrochemical impedance spectroscopy SVET

Preparation and Corrosion Resistance of Silicate Passivation Film Formed on galvanized Zn Coatings

在线全文

学校读者我要写书评

暂无评论

稀有金属材料与工程 2012年第S1期41卷 211-214页

作者： Fan Yunying Jiang Yehua Li Zulai Kunming Univ Sci & Technol Kunming 650093 Peoples R China

In this paper,one kind of silicate passivation technics was reported and by which method silicate passivation film on galvanized Zn coatings with satisfactory property was got.Zn coatings were prepared by conventional plating technics.The solution composition and operating conditions of passivation are:sodium silicate 10-30 g/L,H2SO4 5 mL/L,HNO3 5 mL/L,H2O2 5-20 mL/L,pH 1.5-2.5,passivation time 5-30 s,temperature 25℃.The corrosion resistance of galvanized Zn coatings with different passivated technics were investigated by NSS corrosion test and compared with Zn coatings treated by Cr(VI)and Cr(III).The silicate passivation film can keep no rust for 72 h and obviously shows the best property.Surface morphologies of galvanized Zn coatings with different passivated method were got by metallurgical microscopy,and the silicate passivation film shows the most uniform surface,and has the least micro-hole.All the results show that silicate passivation technics can provide galvanized Zn coatings superior anti-corrosion performance and simultaneously avoid the pollution of chromium,so this technology has a wide application in future.

关键词： galvanized Zn coating silicate conversion film corrosion resistance

Torsion Failure Analysis of galvanized Steel Wires for Transmission and Distribution Lines Based on ANSYS Numerical Simulation

在线全文

学校读者我要写书评

暂无评论

Journal of Shanghai Jiaotong university(Science) 2019年第5期24卷 632-639页

作者：王曼张晓敏龙鹏蒋渝 College of Materials Science and Engineering Sichuan UniversityChengdu610064China Sichuan Tongyuan Electric Power Technology Company Chengdu610072China State Grid Sichuan Electric Power Company Chengdu610041China

This study provides a detailed failure analysis of galvanized steel wires(3 mm in diameter) for a 35 k V transmission and distribution line, which was carried out by combining the conventional material analysis methods with the finite element method(FEM). It is found that the failed material had good plasticity(5% in elongation),and under the soft torsion loading condition(0.75 in stress state soft coefficient), the ductile fracture should occur on the material. Additionally, the theoretical number of torsions calculated by the FEM was 26.2 times, while the actual number of torsions achieved by the test was only 2.2 times and the local fracture surface exhibited brittle fracture characteristics. The results showed that the local torsion brittle fracture of the material with good plasticity was caused by triaxial stress in the torsion condition, which led to the formation of cavity in the pulling stress area in the material’s center, and the finite element calculation results indicated that the stress state soft coefficient at the cavity was distributed between 0.31 and 0.38, and the stress concentration at the cavity was more than twice the normal value. Besides, the Widmanstatten structure formed as the improper hot working process is the corresponding structural reason.

关键词： galvanized steel wire torsion brittle fracture triaxial stress state cavity rupture finite element method(FEM)

Life Cycle Assessment of CCA-Treated Wood Highway Guard Rail Posts in the US with Comparisons to galvanized Steel Guard Rail Posts

在线全文

学校读者我要写书评

暂无评论

Journal of Transportation Technologies 2013年第1期3卷 58-67页

作者： Christopher A. Bolin Stephen T. Smith 不详

A cradle-to-grave life cycle assessment is done to identify the environmental impacts of chromated copper arsenate (CCA)-treated timber used for highway guard rail posts, to understand the processes that contribute to the total impacts, and to determine how the impacts compare to the primary alternative product, galvanized steel posts. Guard rail posts are the supporting structures for highway guard rails. Transportation engineers, as well as public and regulatory interests, have increasing need to understand the environmental implications of guard rail post selection, in addition to factors such as costs and service performance. This study uses a life cycle inventory (LCI) to catalogue the input and output data from guard rail post manufacture, service life, and disposition, and a life cycle impact assessment (LCIA) to assess anthropogenic and net greenhouse gas (GHG), acidification, smog, ecotoxicity, and eutrophication potentially resulting from life cycle air emissions. Other indicators of interest also are tracked, such as fossil fuel and water use. Comparisons of guard rail post products are made at a functional unit of one post per year of service. This life cycle assessment (LCA) finds that the manufacture, use, and disposition of CCA-treated wood guard rails offers lower fossil fuel use and lower anthropogenic and net GHG emissions, acidification, smog potential, and ecotoxicity environmental impacts than impact indicator values for galvanized steel posts. Water use and eutrophication impact indicator values for CCA-treated guard rail posts are greater than impact indicator values for galvanized steel guard rail posts.

关键词： Life Cycle Assessment LCA LCI Environmental Impact Treated Wood Chromated Copper Arsenate CCA Guard Rail Post Greenhouse Gas GHG galvanized Steel

Effect of Hot Dip galvanized Steel Surface Chemistry and Morphology on Titanium Hexafluoride Pretreatment

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Materials Physics and Chemistry 2017年第2期7卷 28-41页

作者： Ville Saarimaa Antti Markkula Kai Arstila Jere Manni Jyrki Juhanoja Top Analytica Oy Turku Finland SSAB Europe Oy H&auml meenlinna Finland Department of Physics University of Jyv&auml skylä Jyv&auml skylä Finland

Titanium hexafluoride pretreatments are known to improve paint adhesion and function as a barrier between the coating and the hot dip galvanized (HDG) steel surface. Interactions at the zinc/pretreatment interface are of utmost importance for the formation of pretreatment layers and the corrosion resistance of color coated hot dip galvanized steels. Removal rate of inert aluminum oxide from HDG steel samples by chemical dissolution was studied. XPS measurements showed that the surface Al2O3 layer thickness decreased rapidly already at mild alkaline cleaning, while complete removal of Al required severe etching. Low reactivity of an Al2O3-rich surface was confirmed by impaired formation of a titanium hexafluoride pretreatment layer. Grain boundaries and deformation twinnings were shown to be of importance for the reactivity of the HDG surface and for the precipitation of the pretreatment chemical. Helium ion microscopy images and electron probe microanalysis (EPMA) of a pretreated sample showed accumulation of the pretreatment chemical at the grain boundaries. Al removal rate was fast at the deformation twinnings at the grain plateaus. Slow Al removal was observed at dendritic valleys and grain boundaries. The results increase understanding of the reactivity of hot dip galvanized steel surface.

关键词： Hot Dip galvanized Steel Aluminum Oxide Pretreatment Surface Morphology Helium Ion Microscopy

Performance of galvanized Steel Reinforcement in Concrete in Sea and Dead Sea Water

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 Materials Science and Chemical Engineering 2015年第5期3卷 46-53页

作者： Sami Masadeh Materials Engineering Department Al-Balqa Applied University Al-Sult Jordan

Steel reinforcements of 8 mm diameter and 24 cm length were cut from steel and after pickling treatment of all specimens. Steel reinforcements then were galvanized by hot dipping method. The measured coating thickness by thickness gage meter of zinc coat was in the range 8 - 11 μm. Bare steel samples were also used for comparison reasons. Each steel bar was inserted in a middle of a plastic tube with 4.5 cm diameter into which concrete was cast. After proper curing, specimens were immersed into 3.5% NaCl and Dead Sea water separately. Electrochemical impedance spectroscopy measurements were performed at different time intervals. Results showed that galvanized steel was corrosion resistant in sea water, and Dead Sea water over the test period.

关键词： Electrochemical Impedance Concrete galvanized Steel Dead Sea Water

The Influence of Gas Flare Particulates and Rainfall on the Corrosion of galvanized Steel Roofs in the Niger Delta, Nigeria

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 Environmental Protection 2011年第10期2卷 1341-1346页

作者： Ajah Ekpeni Obia Hanson Effiong Okon Samuel Aji Ekum Eyo Effiom Eyo-Ita Ekpang Ajah Ekpeni 不详

An experiment was conducted to determine the influence of air-borne particulates exuded from gas flare chambers and rainfall/rain water pH in the rusting of metallic building materials, particularly the galvanized iron roofing sheets, in the Niger Delta Region of Nigeria. Gas flaring and rain fall in this region are rated to be amongst the highest in the world. In this experiment, specimens of the metal (galvanized iron) were exposed in the atmosphere for one year, across four sites within the region. The monthly readings of concentrations of particulate matter (aerosol) and rainfall at the sites were recorded. Equally, the average pH values of the collected rainwater were determined and recorded correspondingly. Multiple linear regression, analysis of variance (ANOVA) and Pearson Product Moment Correlation statistical analyses were performed on the obtained data and the outcome indicated that, with an R2 = 0.678, there was significant influence of industrial aerosol concentration, precipitation and pH on the degradation of galvanized iron roofing material in the region. It was also established that their individual influences were less than their joint impact, suggesting synergism. The ANOVA test further indicated that corrosion was severe in the industrial sites of Ibeno and Ebocha while Ekuri (the control station) recorded the least impact. This study recommends a discontinuation of gas flaring in the region while research on environmentally resilient, relatively cheap and sustainable alternative materials should be encouraged.

关键词： galvanized Iron Gas Flares Mass Loss Pollutants Rainfall