LI Donggui J.P.Simpson R.Schenk Dalian Acid Proof Pump Plant
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China. Sulzer Bros.Ltd
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Winterthur
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Switzerland.
材料科学技术（英文）
The effect of temperature and chloride ion concentration on the electrochemical behaviour of austenitic-ferritic duplex stainless steel COR 25 in an aqueous solution of 60%H_3PO_4+4%H_2SO_4 is studied in this paper. The experiments show that the anodic active peak current on potentiodynamic polarization increases by an order of magnitude with an in- crease of temperature from 50℃ and with an increase of chloride ion from<1 mg/1 to 1500mg/1. Compared with the other materials tested, the austenitic-ferritic duplex stainless steel shows favourable corrosion characteristics in electrochemical tests,being comparable to the fully austenitic alloy Sanicro 28,which has a higher chromium and nickel content,and is much better than GX3CrNiMo2010.Corrosion of the duplex material is normally phase selec- tive,with phase boundary attack after unfavour- able heat treatments.
关键词:
temperature
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null
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LI Donggui J.P.Simpson R.Schenk Dalian Acid Proof Pump Plant
,
China. Sulzer Bros.Ltd
,
Winterthur
,
Switzerland.
材料科学技术（英文）
The effect of heat treatment on the corrosion performance of austenitic-ferritic duplex stain- less steel COR 25 in aqueous solution containing 60%H_3PO_4+4%H_2SO_4+1500 ppm Cl~- at 95℃ was in- vestigated.When the solution temperature was increased from 950℃ to 1230℃,the corrosion resistance increased by two orders of magnitude, as shown by electrochemical measurements,im- mersion tests and direct observation under the scanning electron microscope.The specimens heat treated at solution temperatures of 950℃ and 1030℃ were severely corroded along the phase boundaries;specimens treated at 113C℃ and 1230℃ tended to selective corrosion caused by the dissimilar chromium contents of the aus- tenite and ferrite phases after heat treatment.
关键词:
heat treatment
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null
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null
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H.P. Chen and Z.J. Deng (State Key Lab. for Mechanical Behavior of Materials
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Xi'an Jiaotong University
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Xi'an 710049
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China)
金属学报(英文版)
The effect of specimen thinkness on JR resistance curve has been investigated using low and middle strength steels. As the J dominance regime is reached, the initial J-integral values, J(i), are definite even if the elastic component Ji(e) and plastic component Ji(p)vary with the thinkness of specimen. The wider the specimen width, the larger the Ji(e)/Ji and the smaller the Ji(p)/Ji. The crack propagation resistance, dJR/da and dJp/da, decreases, while dJe/da increases linearly with increasing specimen thinness.Based on the above experimental results, an empirical formula dJ/da = α+β. B is given, which can be used to evaluate the safety of practical structural components.A modified J-integral is presented, upon which a new view is Put forward that the increase in crack growth resistance is induced mainly by the increase in the plastic J-integral component with the crack propagation,
关键词:
: fracture mechanics
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null
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null
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Corrosion Engineering Science and Technology
The corrosion behaviour of electroless Ni-P coatings deposited on A3 steel in simulated acid rain at pH=3.5, 4.0, 4.5, 5.0, 5.5 and 6.0 were investigated by weight loss test and electrochemical test. The protection of A3 steel by Ni-P coating was discussed, and 1Cr18Ni9Ti austenitic stainless steel was used for comparison. The results indicate that the weight loss of the three materials increased, and the corrosion resistance of Ni-P coating decreased, with decreasing pH value of the acid rain solution. The corrosion resistance of A3 steel can be significantly improved with the protection of Ni-P coating, which showed better corrosion resistance than 1Cr18Ni9Ti stainless steel.
关键词:
Simulated acid rain;Ni-P coating;SEM;Acid corrosion;az91d magnesium alloy
ZHANG Longqiang
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TIAN Naiyuan
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ZHANG Jin
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XU Anjun
钢铁研究学报(英文版)
Based on the requirement of compactivity, continuity, and high efficiency, and taking full advantage of cushion capability of flexible parts such as external refining in new generation steel plant, an output model of steel plant was established in terms of matching between BOF and caster. Using this model, the BOF nominal capacity is selected, the caster output and equipment amount are computed, and then the steel plant output is computed.
关键词:
steel plant;output;BOF;nominal capacity;caster;matching
朱佳庆
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何俊伟
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李云德
原子核物理评论
计算了pp和p碰撞中J/ψ的领头阶光生过程的产额。运用非相对论量子色动力学回顾了重夸克偶素产生的色单态机制与色八重态机制,并将它们分别用于处理直接光子过程和分解光子过程。通过与J/ψ产生的领头阶结果的对比可以看出,光生过程对J/ψ产额的修正在大横动量区域变得明显。
关键词:
光生过程
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大横动量区域
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重夸克偶素
Materials Chemistry and Physics
A phytic acid conversion film with especial functional groups was proposed as the pretreatment layer between Ni-P coating and AZ91D magnesium alloy substrate, to replace the traditional pretreatment. In the process, the silane coupling agent was adopted as connector between conversion film and palladium ion with catalysis. The microstructure of the phytic acid conversion coatings was observed using scanning electronic microscopy, while the composition and functional groups were analyzed by energy dispersive spectrometer and Fourier transform infrared spectroscopy. The bonding between Si-OH of the silane coupling agent and hydroxyl of phytic acid was validated by X-ray photoelectron spectroscopy, and the existence of palladium ion was also verified. The subsequent Ni-P deposited on the layer was also characterized by its structure, morphology, and corrosion resistance. The results show that the Ni-P coatings with the phytic acid pretreatment on AZ91D magnesium alloy have good corrosion resistance. (C) 2010 Elsevier B.V. All rights reserved.
关键词:
Magnesium alloy;Phytic acid;Electroless nickel plating;Coupling agent;conversion coatings;corrosion;microstructure;nanoparticles;performance;technology;composites;deposition;behavior;layer
李志宏
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柳卫平
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白希祥
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郭冰
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连钢
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颜胜权
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王宝祥
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陆昀
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曾晟
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苏俊
原子核物理评论
doi:10.3969/j.issn.1007-4627.2005.01.006
利用8Li次级束测量了质心系能量7.8 MeV 2H(8Li, 9Li)1H反应的角分布, 导出了8Li(d, p)9Li反应的天体物理S因子及9Li→8Li+n虚衰变的渐近归一化系数.
关键词:
8Li(d,p)9Li反应
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角分布
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天体物理S因子
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渐近归一化系数
