B.Z. Li1)
,
Y.P. Song1)
,
K.U. Kainer2)
,
H. Zhang3)
,
J.P.Xie1) and R.Xiang4) 1) Department of Materials Engineering
,
Luoyang Institute of Technology
,
Luoyang 471039
,
China2) Institute of Material Science and Technology
,
TU Clausthal
,
D 38678 Clausthal Zellerfeld
,
Germany 3) Institute of Mechanicaland Electrical Engineering
,
Zengzhou University
,
Zengzhou 450052
,
China 4) Luoyang Steeland Iron Group Corp
,
Luoyang 471023
,
China
金属学报(英文版)
Theinvestigation of physicometallurgicalphenomena forthe CC formingof WCP/ Fe Ccom posites wasperformed. Resultsshow that underthe patentcondition, WCP/ Fe Ccomposite surfacelayerof16 20 m m heavycross sectioncan beacquiredintheoutsideofa hollow cylin der. The surface of CTC particlescould be partially dissolved by Fe containing melt. Thefineshortstick like WCcrystallitesarein situseparated neartothesurfaceof CTC particles.Far from the CTC particles,someseparated, finetungsten carbidecrystallitesand Fe, W,Mo and Cretc. containing web composite carbides, are distributed on the matrix of WCP/ Fe Ccomposite. Fe Calloy matrix of the hollow composite cylinder is alloyed in differenthigh levels.
关键词:
physicometallurgical phenomena
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null
,
null
SUN Wenqiang
,
CAI Jiuju
,
MAO Hujun
,
GUAN Duojiao
钢铁研究学报(英文版)
As the largest energy consuming manufacturing sector and one of the most important sources of carbon dioxide (CO2) emissions, the China′s iron and steel industry has paid attention to the study of changing trend and influencing factors of CO2 emissions from energy use. The logarithmic mean Divisia index (LMDI) technique is used to decompose total change in CO2 emissions into four factors: emission factor effect, energy structure effect, energy consumption effect, and steel production effect. The results show that the steel production effect is the major factor which is responsible for the rise in CO2 emissions; whereas the energy consumption effect contributes most to the reduction in CO2 emissions. And the emission factor effect makes a weak negative contribution to the increase of CO2 emissions. To find out the detailed relationship between change in energy consumption or steel production and change in CO2 emissions, the correlation equations are also proposed.
关键词:
CO2 emissions
,
energy use
,
LMDI technique
,
steel production
,
energy consumption
TANG Huiqing
,
GUO Zhancheng
,
ZHAO Zhilong
钢铁研究学报(英文版)
A large deposit of high phosphorus iron ore in China contains an average of 1.2% phosphorus and 50% iron and it has not been utilized. In current work, a novel process to remove phosphorus of the ore has been proposed. The novel process has been demonstrated theoretically and experimentally. The theoretical work (numerical simulation) was carried out with HSC chemistry package and a mathematical model developed using the coexistence theory of slag structure. Gas-based reduction and melt separation experiments were then designed and conducted. Simulation results shows that that all iron compounds in the ore could be reduced to metallic iron using CO/ H2 under temperature above 1000K and the yield of iron is more than 90% under either atmosphere; P can not be reduced and exists as Ca3(PO4)2; in the melt separation process, iron metallization ratio, melting temperature and CaO-adding ratio affect the phosphorus partition between slag and molten metal and CaO-adding ratio is the most distinguished parameter. Results of gas-based reduction agreed well with the simulation except for iron metallization ratio being less than predicted. This difference is mainly attributed to kinetic condition. Results of melt separation experiment show most P is left in the slag sample and some P in the metal sample exists as slag inclusion..
关键词:
High phosphorus iron ore;Numerical simulation;Gas-based reduction;Melt separation
Journal of Electroanalytical Chemistry
5,10,15,20-tetraphenylporphyrin (TPP) and 5,10,15,20-tetra-(4-chlorophenyl)porphyrin (TC1PP) were synthesized and formed adlayers on iron surface. The surface properties of the porphyrin adlayers on iron electrode were characterized by Fourier transform infrared reflection spectroscopy (FT-IR), fluorescence spectrum (FS), scanning electron microscopy (SEM) and electrochemical methods including electrochemical impedance spectroscopy (EIS) and polarization curves. FT-IR and FS results indicated that TPP and TCIPP were able to form adlayers on the iron surface. The electrochemistry results showed that both adlayers of TPP and TCIPP were able to protect iron from corrosion effectively and the protection efficiency of TPP was higher than that of TC1PP. The surface state of iron was characterized by SEM after the iron electrode was corroded in H2SO4 solutions (0.5 M). Besides, quantum chemical calculation was applied to optimize the structure of the two molecules and was able to explain the experimental results to some extent. Results indicated that TPP and TCIPP were good inhibitors for iron corrosion in H2SO4 solutions. (c) 2006 Elsevier B.V. All rights reserved.
关键词:
iron;adlayers;tetraphenylporphyrin;EIS;corrosion inhibitor;self-assembled monolayers;2-dimensional polymer;alkanethiol;monolayers;passive film;gold;protection;surface;acid;copper;spectroscopy
Journal of the Serbian Chemical Society
L-Glutamine was used to form monolayers for the inhibition of the corrosion of iron in 0.50 mol dm(-3) H(2)SO(4). The protection ability of the films was examined by electrochemical impedance spectroscopy. The mechanism of adsorption is discussed using quantum chemical calculations and molecular simulations. Scanning electron microscopy was applied to confirm the formation of L-glutamine monolayers and the inhibitive effect. The results indicate that the molecules of L-glutamine are able to form films on the surface of iron and longer immersion time of the iron electrode in the solution results in a stronger inhibition ability of the Films. The films are formed spontaneously by the adsorption of L-glutamine with a specific affinity of its head-group to the iron surface, hence, the densely and ordered monolayers can be considered as self-assembled.
关键词:
L-glutamine;iron;corrosion;self-assembled monolayer;EIS;self-assembled monolayers;copper corrosion;protection;alkanethiol;steel;films;electrodes;density;acid
Shuwen CHEN
,
Chongmin ZHANG
,
Yuchun ZHAI
材料科学技术（英文）
Simulating to the condition of iron powder production in Hoganas process, the reduction experiments of iron scrap were done by adding different kinds of typical chlorine free waste plastics in China into the scrap column. In this work, the influences of variety of waste plastics added and experiment temperature on the iron scrap reduction rates were studied by thermogravimetric analyses. Moreover, the remained pore canals made by the gasification of the waste plastics were investigated with microscopes. Furthermore, the effect of the remained pores in the column on the iron scrap reducing reaction between gas and solid phases was discussed.
关键词:
Hoganas reduction
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null
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null
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null
Wear
A comparison of the wear resistances of Ni-hard 4 and high-chromium (15-3) cast irons has been made under different testing conditions. Several kinds of wear tester were employed (reciprocating grooving tester, dry sand rubber wheel tester, single-pass pendulum impact grooving tester, and blasting erosion tester). The results show that whereas Ni-bard 4 seems to be more suitable to resist blasting erosion, high-chromium cast iron is better at resisting grooving wear, the ranking of materials changing with testing conditions. The measured wear resistance of the irons has been explained in terms of microstructure and hardness. Material removal occurred as a result of different mechanisms. For grooving wear, a harder metal surface is preferable, under blasting erosion conditions, material removal is mainly determined by the matrix.
关键词:
