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Effect of temperature on corrosion behavior of 3003 aluminum alloy in ethylene glycol–water solution

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Chinese Journal of Aeronautics 2016年第4期29卷 1142-1150页

作者： Chen Xin tian wenming Li Songmei Yu Mei Liu Jianhua School of Material Science and Technology Beihang University

The effect of temperature on the corrosion behavior of 3003 aluminum alloy in ethylene glycol–water solution was investigated by potentiodynamic polarization and electrochemical impedance spectroscopy(EIS) techniques. The surface characterization was observed and determined by scanning electron microscopy(SEM), atomic force microscopy(AFM) and energy dispersive spectrometer(EDS). The results demonstrate that the anodic aluminum dissolution and the cathodic oxygen reduction were accelerated by the increased temperature. However, as temperature was over60 °C, the solubility and concentration of oxygen decreased, resulting in the inhibition of cathodic reaction. The cathodic reaction rate of 3003 aluminum alloy rose to the maximum at 60 °C. The Warburg impedance in Nyquist diagram diminished and then was replaced by a negative capacitance caused by the absorption of intermediate corrosion product on electrode. On the other hand,after potentiodynamic measurements, 3003 aluminum alloy suffered pitting corrosion. The dissolution of aluminum alloy around secondary phase particles expanded both horizontally and vertically.

关键词： 3003 aluminum alloy Corrosion behavior Electrochemical measure ments Ethylene glycol Temperature

Evolution of suspension bridge structural systems,design theories,and shape-finding methods:A literature survey

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Journal of Traffic and Transportation Engineering(English Edition) 2024年第2期11卷 225-244页

作者： wenming Zhang Genmin tian Yupeng Chen Key Laboratory of Concrete and Pre-stressed Concrete Structures of Ministry of Education Southeast UniversityNanjing 210096China State Key Laboratory of Safety Durability and Healthy Operation of Long Span BridgesSoutheast UniversityNanjing 210096China

Modern suspension bridges exhibit a trend of lighter structures,more diversified structural forms,and longer spans,the latter already exceeding two kilometers.Bridge performance under dead and live loads depends on their structural and main cable systems,while cablesupported bridges especially rely on the design analysis and construction control of the main cable.This literary survey systematically analyzes the research progress and state-ofthe-art status quo in the structural systems and design theories of suspension bridges,focusing on the structural systems,main cable shape analyses,live load effect analyses,and emerging lucrative research directions.More than 100 reliable references have been surveyed.(1)Multi-span or multi-main cable schemes appeal to increasing attention,which may become a better choice in terms of structural systems in scenarios with extremely long spans and heavy loads.The cable layouts,such as spatial main cables and hybrid cable-stayed suspension systems have also become feasible approaches for enhancing structural stiffness.(2)The shape-finding analysis during the construction phase is more complex and has more essential factors than that of the completed bridge state.Refined theories combining analytical methods and finite element methods are more suitable for the shape-finding analysis of complex cable systems than any single theory of the two,especially for novel cable systems.(3)The live load effect analysis methods based on traditional deflection theory or modified/improved deflection theories still have wide applications,but the refined theory of treating hangers as discrete members is also constantly developing,which is expected to provide new ideas for more complex structural analysis under the different types of live loads and their distribution forms.

关键词： Suspension bridges Structural system Cable analysis Shape-finding analysis Construction control and calculation Live load effect

塑性变形加工对纯锌在天津土壤浸出液中腐蚀行为的影响

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中国腐蚀与防护学报 2024年第2期44卷 497-504页

作者：李文杰车晓钰唐永存刘光明田文明何华林刘晨辉国网天津市电力公司天津300010 南昌航空大学材料科学与工程学院南昌330063 北华航天工业学院材料工程学院廊坊065000 成都诺嘉伟业科技有限公司成都611330

由热挤压获得了不同变形加工量的工业纯锌棒材,通过电化学测试、浸泡加速腐蚀实验及金相表征研究了变形加工量对纯锌微观组织及腐蚀特性的影响。结果表明:铸造纯锌金相组织较为粗大,粗晶粒内部存在大量细小亚晶粒及铸造孪晶。随塑性变... 详细信息

由热挤压获得了不同变形加工量的工业纯锌棒材,通过电化学测试、浸泡加速腐蚀实验及金相表征研究了变形加工量对纯锌微观组织及腐蚀特性的影响。结果表明:铸造纯锌金相组织较为粗大,粗晶粒内部存在大量细小亚晶粒及铸造孪晶。随塑性变形加工量的增加,纯锌的初级晶粒会显著细化,亚晶粒会融合长大,孪晶显著减少直至消失。在土壤浸出液中纯锌的点蚀电位及钝化区间随变形量的增加而增大,腐蚀电流密度及维钝电流密度则呈减小趋势,塑性变形处理提升了纯锌的钝化膜电阻及腐蚀反应中的电荷转移电阻。纯锌的金相组织均匀性随塑性变形量的增加持续改善,进而显著提升了纯锌在土壤浸出液中的耐蚀能力。

关键词：纯锌塑性加工金相组织电化学土壤腐蚀

A positive correlation between local photocurrent and grain size in a perovskite solar cell

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Journal of Energy Chemistry 2022年第9期31卷 8-13,I0001页

作者： Xiaoxia Zhao Zhiyong Wang wenming tian Xianchang Yan Yantao Shi Yudi Wang Zhonggao Sun Shengye Jin School of Physics and Electronic Technology Liaoning Normal UniversityDalian 116029LiaoningChina State Key Laboratory of Molecular Reaction Dynamics and the Dynamic Research Center for Energy and Environmental Materials Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina State Key Laboratory of Fine Chemicals Department of ChemistrySchool of Chemical EngineeringDalian University of TechnologyDalian 116024LiaoningChina

Developing an interplay between the local morphological character and its local photovoltaic(PV)parameters in a perovskite thin film is essential for guiding the construction of highly-efficient perovskite solar cells(PSCs). To achieve a higher PSC performance, great efforts have been devoted to the growth of larger perovskite grains;however, how the gain size can influence the PSC performance in a working device remains unclear. Herein, using laser-scanned confocal microscopy coupled with a photocurrent detection module, we realize local photocurrent, photoluminescence(PL) intensity and PL lifetime mappings directly in a working PSC. For perovskite grains of various sizes(from ~500 nm to a few micrometers), their local photocurrent exhibit a statically positive correlation with the grain size, but anti-correlated with the grain’s local PL intensity. This result suggests that a larger perovskite grain likely has fewer defects and more importantly better interfacial contact with the charge collection layers and thus leads to higher charge collection efficiency, and the optimum grain size is found to be ≥2 μm.Our result provides important guidance to the growth and control of perovskite microstructures toward the further improvement of PSC performance.

关键词： Photocurrent mapping Photoluminescence mapping Perovskite solar cell Grain size

固溶处理对超高Zn含量7系铝合金组织与性能的影响

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北华航天工业学院学报 2024年第1期34卷 6-8,11页

作者：田文明乐杨张志坤高硕北华航天工业学院材料工程学院河北廊坊065000

本研究利用气雾化法制备微米级超高Zn含量(质量分数25%)铝合金粉末,再通过放电等离子烧结(SPS)可制备出富Zn增强相细小弥散的块体合金,最后经过固溶-自然时效热处理可进一步优化合金增强相的种类、尺寸及分布,在固溶温度400℃时,固溶-... 详细信息

本研究利用气雾化法制备微米级超高Zn含量(质量分数25%)铝合金粉末,再通过放电等离子烧结(SPS)可制备出富Zn增强相细小弥散的块体合金,最后经过固溶-自然时效热处理可进一步优化合金增强相的种类、尺寸及分布,在固溶温度400℃时,固溶-自然时效后的超高Zn含量铝合金的抗拉强度可达540MPa,断裂伸长率为5.3%,气雾化-SPS烧结-固溶时效的工艺路线为超高Zn含量7系铝合金的制备提供了新的思路。

关键词：铝合金气雾化 SPS烧结固溶-时效超高Zn含量

Tailoring morphology symmetry of bismuth vanadate photocatalysts for efficient charge separation

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Science China Chemistry 2023年第12期66卷 3611-3619页

作者： Yuting Deng Hongpeng Zhou Chenwei Ni Fengke Sun Wenchao Jiang Ruotian Chen wenming tian Can Li Rengui Li State Key Laboratory of Catalysis Dalian National Laboratory for Clean EnergyiChEM(Collaborative Innovation Center of Chemistry for Energy Materials)Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Molecular Reaction Dynamics and the Dynamic Research Center for Energy and Environmental Materials Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China

Although spatial charge separation between different facets of semiconductor crystals has been recognized as a general strategy in photocatalysis, the vital role of crystal morphology symmetry in charge separation properties still remains elusive. Herein,taking monoclinic bismuth vanadate(BiVO_(4)) as a platform, we found distinct charge separation difference via rationally tailoring the morphology symmetry from octahedral to truncated octahedral crystals. For octahedral BiVO_(4), photogenerated electrons and holes can be separated between edges and quasi-equivalent facets. However, as for truncated octahedral crystals,photogenerated electrons tend to transfer to {010} facets while photogenerated holes prefer to accumulate on {120} facets, thus realizing the spatial separation of photogenerated charge between different facets. Morphology tailoring of BiVO_(4) crystals leads to a significantly improved photogenerated charge separation efficiency and photocatalytic water oxidation activity. The built-in electric field for driving the separation of photogenerated electrons and holes is considered to be modulated by tuning the morphology symmetry of BiVO_(4) crystals. This work discloses the significant roles of morphology symmetry in photogenerated charge separation and facilitates the rational design of artificial photocatalysts.

关键词： bismuth vanadate morphology symmetry tailoring photocatalysis spatial charge separation

Characterization and manipulation of the photosystem Ⅱ-semiconductor interfacial molecular interactions in solar-to-chemical energy conversion

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Journal of Energy Chemistry 2022年第7期31卷 437-443,I0012页

作者： Min He Wangyin Wang Zheyi Liu Wenxiang Zhang Jinan Li wenming tian Ye Zhou Yan Jin Fangjun Wang Can Li CAS Key Laboratory of Separation Sciences for Analytical Chemistry Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian National Laboratory for Clean EnergyDalian 116023LiaoningChina State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina

Semi-artificial photosynthesis interfacing catalytic protein machinery with synthetic photocatalysts exhibits great potential in solar-to-chemical energy conversion. However, characterizing and manipulating the molecular integration structure at the biotic-abiotic interface remain a challenging task. Herein,the biointerface molecular integration details of photosystem II(PSII)-semiconductor hybrids, including the PSII orientation, interfacial microdomains, and overall structure modulation, are systematically interrogated by lysine reactivity profiling mass spectrometry. We demonstrate the semiconductor surface biocompatibility is essential to the PSII self-assembly with uniform orientation and electroactive structure.Highly directional localization of PSII onto more hydrophilic Ru/Sr Ti O_(3):Rh surface exhibits less disturbance on PSII structure and electron transfer chain, beneficial to the high water splitting activity.Further, rational modification of hydrophobic Ru_(2)S_(3)/Cd S surface with biocompatible protamine can improve the hybrid O_(2)-evolving activity 83.3%. Our results provide the mechanistic understanding to the structure–activity relationship of PSII-semiconductor hybrids and contribute to their rational design in the future.

关键词： PSII-semiconductor hybrids Biointerface molecular interaction Solar-to-chemical energy conversion Mass spectrometry Lysine reactivity profiling

不锈钢在盐酸介质中的耐腐蚀性能研究现状及展望

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焊管 2024年第4期47卷 1-9,24页

作者：梁东光张君阳陈芳芳田文明程法嵩北华航天工业学院材料工程学院河北廊坊065000 中国航发贵州黎阳航空动力有限公司工程技术部贵阳550014

不锈钢作为用量最大的耐蚀合金,广泛应用于石油石化、医药等富含盐酸的环境中,但随着服役环境日益苛刻,不锈钢仍会发生腐蚀,如何有效防止腐蚀失效,成为了金属材料腐蚀防护领域研究的重点。介绍了不锈钢在盐酸介质中的腐蚀研究方法,重点... 详细信息

不锈钢作为用量最大的耐蚀合金,广泛应用于石油石化、医药等富含盐酸的环境中,但随着服役环境日益苛刻,不锈钢仍会发生腐蚀,如何有效防止腐蚀失效,成为了金属材料腐蚀防护领域研究的重点。介绍了不锈钢在盐酸介质中的腐蚀研究方法,重点分析了不锈钢耐盐酸腐蚀的机理、钝化膜的溶解破坏行为和影响因素,指出了耐盐酸腐蚀不锈钢的选材原则和发展方向,为不锈钢在盐酸腐蚀环境中的应用和选材提供参考。

关键词：不锈钢盐酸腐蚀钝化膜电化学

Surface passivation and hole extraction:Bifunctional interfacial engineering toward high-performance all-inorganic CsPbIBr2 perovskite solar cells with efficiency exceeding 12%

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Journal of Energy Chemistry 2022年第11期31卷 387-393,I0011页

作者： Qi Liu Junming Qiu Xianchang Yan Yuemeng Fei Yue Qiang Qingyan Chang Yi Wei Xiaoliang Zhang wenming tian Shengye Jin Ze Yu Licheng Sun State Key Laboratory of Fine Chemicals Dalian University of Technology(DUT)Dalian 116024LiaoningChina School of Materials Science and Engineering Beihang UniversityBeijing 100191China State Key Laboratory of Molecular Reaction Dynamics and the Dynamic Research Center for Energy and Environmental Materials Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina Key Laboratory of Materials Modification by Laser Ionand Electron Beams(Ministry of Education)Dalian University of Technology(DUT)Dalian 116024LiaoningChina Center of Artificial Photosynthesis for Solar Fuels School of ScienceWestlake UniversityHangzhou 310024ZhejiangChina Department of Chemistry School of Engineering Sciences in ChemistryBiotechnology and HealthKTH Royal Institute of Technology10044 StockholmSweden

All-inorganic CsPbIBr2perovskite solar cells(PSCs)have attracted considerable research attention in recent years due to their excellent thermal stability.However,their power conversion efficiencies(PCEs)are relatively low and still far below the theoretical limit.Here,we report the use of an organic dye molecule(namely VG1-C8)as a bifunctional interlayer between perovskite and the hole-transport layer in CsPbIBr2PSCs.Combined experimental and theoretical calculation results disclose that the multiple Lewis base sites in VG1-C8 can effectively passivate the trap states on the perovskite films.Meanwhile,theπ-conjugated dye molecule significantly accelerates the hole extraction from the perovskite absorber as evidenced by the photoluminescence analysis.Consequently,the VG1-C8 treatment simultaneously boosts the photovoltage and photocurrent density values from 1.26 V and 10.80 mA cm^(-2) to 1.31 V and 12.44 m A cm^(-2),respectively.This leads to a significant enhancement of PCE from 9.20%to12.10%under one sun irradiation(AM 1.5G).To our knowledge,this is the record efficiency reported so far for CsPbIBr_(2) PSCs.Thus,the present work demonstrates an effective interfacial passivation strategy for the development of highly efficient PSCs.

关键词： All-inorganic perovskite solar cells CsPbIBr2 Defect passivation Hole extraction High efficiency