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MICROSTRUCTURE OF ELECTRODEPOSITED Ni-W-P-SiC COMPOSITE COATINGS

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中国有色金属学会会刊：英文版 1997年第1期7卷 23-27页

作者： guo, zhongcheng Yang, Xianwan Liu, Hongkang Kunming Univ of Science & Technology Kunming China

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关键词： electrodeposition Ni W P SiC composite coatings microstructure

Effect of the current density on electrodepositing alpha-lead dioxide coating on aluminum substrate

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Acta Metallurgica Sinica(English Letters) 2009年第5期22卷 373-382页

作者： Burning CHEN zhongcheng guo Hui HUANG Xianwan YANG Yuandong CAO Faculty of Materials and Metallurgical Engineering Kunming University of Science and TechnologyKunming 650093 China

The α-PbO2 electrodes are prepared by anodic electrodeposition on Al/conductive coating electrode from alkaline plumbite solutions in order to investigate the effect of the different current densities on the properties of α-PbO2 electrodes. The physic- ochemical properties of the α-PbO2 electrodes are analyzed by using SEM, EDS, XRD, Tafel plot, linear sweep voltammetry （LSV） and A.C. impedance. A compact and uniform layer of lead dioxide ：）vas obtained at the current density of 3 ***-2. A further increase in current density results in smaller particles with high porosity. EDS and XRD analyses have shown that the PbO2 deposited in alkaline conditions is highly non stoichiometric, and the PbO impurities are formed on the surface layer besides the α-PbO2. The corrosion resistance of α-PbO2 at the low current density is superior to that of the high current density. It can be attributed to a porous layer of deposited films at high current densities in aqueous Zn2＋ 50 g·L^-1, H2SO4 150 When used as anodes for oxygen evolution g·L^-1, the Al/conductive coating/α-PbO2 exhibits lower potential compared to Pb electrode. Al/conductive coating/α-PbO2 electrode with the best electrocatalytic activity was obtained at current density of 1 mA·cm^-2. The lowest roughnest factor was obtained at 1 mA·cm^-2.

关键词： Alpha lead dioxide Electrodeposition Current density Anodes Oxygen evolution

华北落叶松光抑制的垂直空间异质性及其主要影响因素

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生态学杂志 2025年第2期44卷 383-388页

作者：周颖高媛赵浩然郭忠诚籍翠莹杨陈刘强河北农业大学河北保定071000

为深入了解华北落叶松的光合生理生态特征,探究其光抑制现象的内在机理,本研究以河北省塞罕坝机械林场华北落叶松人工林为对象,利用Li⁃6400便携式光合仪,对不同轮层针叶持续强光照射,分析判断导致光抑制现象产生的主要限制因素,以及净... 详细信息

为深入了解华北落叶松的光合生理生态特征,探究其光抑制现象的内在机理,本研究以河北省塞罕坝机械林场华北落叶松人工林为对象,利用Li⁃6400便携式光合仪,对不同轮层针叶持续强光照射,分析判断导致光抑制现象产生的主要限制因素,以及净光合速率(P_(n))与环境因子的关系。结果表明:在强光照射下,华北落叶松上层和中层针叶均发生光抑制现象,气孔限制值(L_(s))与胞间CO_(2)浓度(C_(i))变化趋势相反。上层和中层针叶P_(n)均与相对湿度(RH)呈显著相关(相关系数分别为0.720和0.934),与饱和水汽压差(VPD)和温度(T)存在显著相关性(相关系数分别为-0.850和-0.820);下层针叶P_(n)与RH、VPD和T也均呈显著相关,但与上层和中层针叶的相关性趋势相反。本研究表明,光抑制现象主要发生在树冠的上层和中层,RH、VPD、T是影响华北落叶松冠层P_(n)的主要环境因子,但上、中层针叶和下层针叶对环境因子的响应趋势存在明显差异,研究结果可为调控树冠结构、改善微环境、缓解冠层光抑制现象奠定基础。

关键词：强光气孔限制非气孔限制环境因子

Properties of Al/Conductive Coating/α-PbO2-CeO2-TiO2/β-PbO2-WC-ZrO2 Composite Anode for Zinc Electrowinning

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Journal of Wuhan University of Technology(Materials Science) 2017年第3期32卷 538-546页

作者：杨健陈步明 guo zhongcheng HUANG Hui XU Ruidong JIN Bingjie Faculty of Metallurgical and Energy Engineering Kunming University of Science and Technology Kunming 650093 China Kunming Hendera Science and Technology Co.Ltd Kunming 650106 China

The properties of Al/conductive coating/α-PbO2-CeO2-TiO2/β-PbO2-WC-ZrO2 composite anode for zinc electrowinning were investigated. The electrochemical performance was studied by Tafel polarization curves（Tafel）, electrochemical impedance spectroscopy（EIS） and corrosion rate obtained in an acidic zinc sulfate electrolyte solution. Scanning electron microscopy（SEM）, X-ray diffraction（XRD）, and energy dispersive X-ray spectroscopy（EDXS） were used to observe the microstructural features of coating. Anodes of Al/conductive coating/α-PbO2-CeO2-TiO2/β-PbO2, Al/conductive coating/α-PbO2-CeO2-TiO2/β-PbO2-WC, Al/conductive coating/α-PbO2-CeO2-TiO2/β-PbO2-ZrO2, and Pb-1%Ag anodes were also researched. The results indicated that the Al/conductive coating/α-PbO2-CeO2-TiO2/β-PbO2-WC-ZrO2 showed the best catalytic activity and corrosion resistant performance; the intensity of diffraction peak exhibited the highest value as well as a new PbWO4 phase; the content of WC and ZrO2 in coating showed the highest value as well as the finest grain size.

关键词： coating composite anode corrosion resistant electrocatalytic activity zinc electrowinning

Cooperative composites anchored with single atom Pb and carbon confined PbO nanoparticles for superior lead-carbon batteries

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Journal of Energy Chemistry 2024年第10期97卷 486-497,I0010页

作者： Puqiang He Yi Yang Hui Huang Jing Huang Hongbiao Wang Yapeng He zhongcheng guo Faculty of Metallurgical and Energy Engineering Kunming University of Science and TechnologyKunming 650093YunnanChina Metallurgical Electrode Material Engineering Technology Research Center of Yunnan Province Kunming 650106YunnanChina Kunming Hendera Technology Co.LTD. Kunming 650106YunnanChina

The mitigation of sulphation and parasitic hydrogen evolution is considered as prominent research emphasis for the development of lead-carbon batteries(LCBs)in large-scale energy storage ***,cooperative Pb-C composites consisting of single atom Pb and carbon-encapsulated PbO nanoparticles were prepared by freeze-drying technique and pyrolytic reduction to address above *** innovative use of Pb^(2+)to cross-link sodium alginate enabled a uniform distribution of Pb in the composites,generating Pb-C-PbO three-phase *** analysis and theoretical calculations revealed the synergistic interactions between single-atom Pb and PbO nanoparticles in suppressing parasitic hydrogen evolution and promoting the adsorption of Pb *** presence of monatomic Pb and PbO enhanced the affinity of the composites for the negative active materials and facilitated the transformation of the active materials from bulk into spherical shapes to enhance the specific surface area,thereby counteracting *** the coordinated integration of various functionalities offered by Pb@C-x,the cycle life of the battery at HRPSoC reaches 7025 cycles,which is two times for LCB with pure carbon ***,the discharge capacity increased from 3.52 to 3.79 *** study provides substantial insights into the construction of Pb-C composites for LCBs to inhibit negative sulphation and hydrogen evolution.

关键词： Lead-carbon battery Negative sulphation Hydrogen evolution Single-atom Lead carbon composites

Effects of Zr content on electrochemical performance of Ti/Sn-Ru-Co-ZrO_(x)electrodes

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International Journal of Minerals,Metallurgy and Materials 2022年第12期29卷 2181-2188页

作者： Linhui Chang Sheng Chen Xionghui Xie Buming Chen Haihong Qiao Hui Huang zhongcheng guo Ruidong Xu Faculty of Metallurgical and Energy Engineering Kunming University of Science and TechnologyKunming 650093China Research Center of Metallurgical Electrode Materials Engineering Technology Kunming 650106China Kunming Hendera Science and Technology Co. Ltd.Kunming 650106China North Night Vision Technology Research Institute Group Co. Ltd.Optical CompanyKunming 650093China

The low cell voltage during electrolytic Mn from the MnCl_(2) system can effectively reduce the power *** this work,the Ti/Sn−Ru−Co−Zr modified anodes were obtained by using thermal decomposition *** physical parameters of coatings were observed by SEM(scanning electron microscope).Based on the electrochemical performance and SEM/XRD(X-ray diffraction)of the coatings,the influence of Zr on electrode performance was studied and *** the mole ratio of Sn−Ru−Co−Zr is 6:1:0.8:0.3,the cracks on the surface of coatings were the smallest,and the compactness was the best due to the excellent filling effect of ZrO_(2)***,the electrode prepared under this condition had the lowest mass transfer resistance and high chloride evolution activity in the 1mol%NH_(4)Cl and 1.5mol%HCl *** service life of 3102 h was achieved according to the empirical formula of accelerated-life-test of the new type anode.

关键词： Ti/Sn−Ru−Co−Zr anode electrochemical Mn electrowinning manganese chloride system service life

PROCESS AND PROPERTIES OF ELECTROLESS PLATING RE-Ni-B-SiC COMPOSITE COATINGS

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Acta Metallurgica Sinica(English Letters) 1995年第2期8卷 118-122页

作者： guo zhongcheng LIU Hongkang WANG Zhiyin WANG Min(Kunming Institute of Technology,Kunming. China ) Kunming Inst of Technology Kunming China

Technology and properties of electroless composite RE-Ni-B-SiC coatings have been *** show that stabilizer plys a decisive role in electroless composite Ni-B-SiC,the addition of appropriate quantity of RE(rare earth) into the Ni-B-SiC bath not only increases SiC content in composite coatings,their hardness and wear resistance but also improves crystalline fineness,Wear resistance increases with the increase of *** and wear resistance of composite coatings reach peak values a fter heat treatment at 4OO and 500℃ for 1h respectively.

关键词： electroless plating Ni-B-SiC-RE composite coating

Electrodeposition of Ni-W Amorphous Alloy and Ni-W-SiC Composite Deposits

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Journal of Materials Science & Technology 2000年第3期16卷 323-326页

作者： zhongcheng guo, Xiaoyun ZHU, Dacheng ZHAI and Xianwan YANG (Department of Metallurgy, Kunming University of Science and Technology, Kunming 650093, China) Department of Metallurgy Kunming University of Science and Technology Kunming 650093 China

Ni-W alloys and their composite deposits are electroplated on the metals when an appropriate complex agent is selected on the base of the theories of electrochemistry and complex chemistry, and the principle of induced codeposition. Effects of the bath composition, pH value, temperature and current density on the electrode position of Ni-W alloys and their composite deposits have been investigated, and the effect of heat treatment temperature on the hardness, structure and cohesive force of the amorphous Ni-W alloys and their composite deposits are also discussed. Results showed that the alloys containing more than 44 wt pct W content and the composite deposits containing 7.8 wt pct SiC content could be obtained by making use of the appropriate bath composition and plating conditions. Alloys and their composite deposits with over 44 wt pct W content show amorphous structure. The hardness of amorphous Ni-W alloys and their composite deposits increases obviously when heated, and can reach to 1350 HV and 1520 HV respectively for 46 wt pct W content. The cohesion on Cu, carbon steel and stainless steel is very good.

关键词： SiC Electrodeposition of Ni-W Amorphous Alloy and Ni-W-SiC Composite Deposits Ni

PROPERTIES OF ELECTRODEPOSITED AMORPHOUS Ni-W-P-SiC COMPOSITE COATINGS

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Acta Metallurgica Sinica(English Letters) 1996年第1期9卷 44-48页

作者： guo zhongcheng LIU Hongkang WANG Zhiyin WANG Min(Department of Metallurgy,Kunming institute of Technology,Kunming 650093,China) Kunming Inst of Technology Kunming China

The Effects of heat treatment temperature on the hardness,wear resistance and structure of the amorphous Ni-W-P-SiC composite coatings have been *** results show that Ni-W-P-SiC composite coatings are amorphous under 300℃, partially crystalline at 300-400℃,and crystalline when heat treatment temperature reaches 400℃,the crystals being fine Ni3P phase *** hardness,wear resistance and the crystallization temperature of the composite coatings increase when an additive is added into the *** hardness and wear resistance of the coatings increase with increasing heat treatment temperature,and they will reach their peak values when the heat treatment temperature reaches 400℃.Corrosion experiment indicates that the corrosion resistance of amorphous Ni-W-P-SiC composite coatings in various kinds of corrosive media except nitric acid is better than that of stainless steel *** electron microscopy observation shows that the additive has no effect on the surface appearance of the coatings,but the current density and the pH value have considerable effects on the surface appearance.

关键词： electrodeposition Ni-W-P-SiC composite coating amorphous