LI Xiaogang CHEN Hua YAO Zhiming LI Jin KE Wei Institute of Corresion and Protection of Metals
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Academia Sinica
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Shenyang
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China lecturer
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Institute of Corrosion and Protection of Metals
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Academia Sinica
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Shenyang 110015
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China
金属学报(英文版)
The hydrogen attack of austenitic stainless steel 304 exposed to hydrogen under the pressure of 5 MPa at 733 K for 2×10~4 h in service was detected.The microstructure has been studied by SEM and TEM.Hydrogen was determined with molten samples which had tempered at.573,673,773,873,and 973 K for 6 h.The results showed that hydrogen attack in this steel was due to methane bubbles which resulted in occuring of Cr_(23)C_6.Thermodynamic analysis of hydrogen attack for stainless steel 304 was discussed.
关键词:
hydrogen attack
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Materials and Corrosion-Werkstoffe Und Korrosion
In order to investigate the galvanic anodic protection (GAP) of ferrous metals (such as 410, 304 and 316 stainless steels) in acid solutions by doped polyaniline (PANi), separate doped PANi powder-pressed electrodes with different surface areas (the area ratio of the PANi electrode to stainless steel is between 1:1 and 1:2) have been prepared. These were coupled with ferrous metal in the following solutions: 5 M sulphuric acid, 5 M phosphoric acid and industrial phosphoric acid (containing 5 M phosphoric acid and 0.05% chloride ion) to construct a galvanic cell, in which PANi is cathode while ferrous metal is anode. The results indicate that a PANi electrode with sufficient area can provide corrosion protection to stainless steel in these acidic solutions. A pilot scale coupling experiment was carried out. The results indicate that PANi is a promising material as an electrode for the anodic protection of ferrous metals in acidic solutions in industrial situations.
关键词:
conducting polymer-coatings;corrosion protection;stainless-steel;spectroscopy;passivation;performance;mechanism;behavior;primers;films
材料科学技术（英文）
Molecular dynamics simulations combining potentials mapping technique have been performed to investigate the structure of: binary liquid Li-Mg alloys at a constant temperature (924 K). Pair correlation function, bond orientational order and pair analysis approach are adopted to give geometrical descriptions on atom arrangement. The trends of splitting of second-peak in pair correlation function, the orientational order parameters and evolution of various symmetries of bonded pairs, etc., vs composition have been examined. The difference and concordance between the bond-orientational order and pair analysis have been first given out. Based on the distribution of attractive part of potentials, it is concluded that the attractive part would dominate the characterization of structure in liquid metals. In addition, icosahedra, defective icosahedra, Frank-Kasper polyhedra and Bernal hole polyhedra formed in liquid Li-Mg alloys are also counted.
关键词:
variational thermodynamic calculations;sd metals;order
Surface & Coatings Technology
The super light Mg-Li alloys exhibit excellent formability due to the addition of lithium, but the corrosion resistance is deteriorated. A novel conversion film is developed to improve the corrosion resistance. The surface morphology of conversion film was observed using scanning electron microscopy (SEM). The chemical composition was analyzed by X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). The corrosion behaviors of Mg-8.8Li alloy and conversion film were investigated with electrochemical and immersion tests. The experimental results indicated that the Mg-8.8Li alloys with and without the protection of conversion film can both be used in NaOH solution safely. But the Mg-8.8Li substrate was susceptible to corrode in NaCl and Na(2)SO(4) solutions, and the conversion film can prevent them from corroding. Compared with the NaCl solution, the Na(2)SO(4) solution was a strong corrosive medium to the conversion film. (C) 2008 Elsevier B.V. All rights reserved.
关键词:
Phosphate;Conversion film;Mg-Li alloy;Corrosion resistance;az91 magnesium alloy;mg-li alloy;corrosion behavior;coatings;surface
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
HUANG Jianshun CHEN Junming Shanghai Institute of Metallurgy
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Academia Sinica
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Shanghai
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China Research Associate
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Shanghai Institute of Metallurgy
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Academia Sinica
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Shanghai 200050
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China
金属学报(英文版)
Crystal structure of γ-Li_xFe_2O_3,inserted Li electrochemically,was studied by Moss- bauer spectroscopy together with X-ray diffraction,XPS and electrochemical method,On the insertion of Li at low current density,the crystal structure is keeping original spinel; while at higher current density or by thermal activation,owing to violent movement of Li~+ ions,part of crystal structure transforms into rock type similar to face-centered cubic structure of ferrous oxide.The transition channels during insertion of Li~+ ions and limitation of Li~+ ions inserted were discussed.
关键词:
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Journal of Chemical Physics
With the help of potential mapping techniques, molecular dynamics simulations have been performed to study the local structure features in binary liquid Li-Tl alloys. The generalized nonlocal model pseudopotentials have been chosen as the bases for our calculations. Both the bond orientational order and pair analysis approach have been adopted as the basic structural functions to examine the structure features in binary liquid Li-Tl alloys. In addition, bonded pairs with various symmetries, icosahedra, defective icosahedra, Frank-Kasper polyhedra, etc., formed in the Li-Tl alloys are examined in detail, and the relationship between the structure features and composition has been established. The results show that the distribution of attractive parts of the potentials play an important role in characterizing the Liquid structure. Finally, the results are discussed in detail. (C) 1995 American Institute of Physics.
关键词:
variational thermodynamic calculations;bond-orientational order;rapidly quenched metals;molecular-dynamics;sd metals;glasses;crystallization;transitions;solids
