检索结果-南通市图书馆

Acta Metallurgica Sinica(English Letters) 2022年第9期35卷 1559-1571页

作者： Mingyu Zhu Yingwei Song kaihui dong Dayong Shan En-Hou Han Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei230026China

In the early stage of plasma electrolytic oxidation(PEO),the quick formation of the initial oxide film on the surface of the aluminum substrate is necessary for the subsequent discharge spark ***,the compactness of the initial oxide film greatly affects the quality of the PEO coating,but the related mechanisms are not investigated in *** this paper,the status of the initial oxide film was adjusted by adding the(NaPO)into the based electrolyte,and then the effect of initial oxide film on the formation of the PEO coating was *** and chemical composition were analyzed by scanning electron microscope,transmission electron microscopy and X-ray photoelectron *** compactness of the initial oxide film was characterized by Mott-Schottky *** corrosion resistance was measured by electrochemical impedance *** results show that the addition of(NaPO)can promote the co-deposition of phosphide compound into the initial oxide film and improve the film compactness,which is beneficial for the more uniform spark discharge in the later *** a result,the addition of(NaPO)is helpful to obtain PEO coating with better performance.

关键词： Aluminum alloys Plasma electrolytic oxidation Initial oxide film Growth process Spark discharge Compactness

Comparison of the corrosion behavior of AM60 Mg alloy with and without self-healing coating in atmospheric environment

在线全文

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2021年第4期9卷 1224-1237页

作者： Yingwei Song Dan Liu Weineng Tang kaihui dong Dayong Shan En-Hou Han Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China Baosteel Central Research Institute(R&D Center) China Baowu Group655 Fujin RoadShanghai 201900China

Coatings on the surface of Mg alloys are inevitably damaged during their practical applications,and corrosion can easily initiate from the damaged areas to accelerate the failure of Mg parts.A dual self-healing coating has already been developed to solve this problem in our previous *** the practical application of this coating,it is necessary to investigate its service behavior in atmospheric ***,the corrosion behavior of AM60 Mg substrate with and without the self-healing coating was compared in Shenyang industrial atmospheric *** results show that the enrichment of sediments and rainwater on the scratch areas can accelerate the corrosion of the exposed Mg *** inhibitors can be released from the damaged coating to inhibit *** dual self-healing coating shows better inhibition ability to narrow scratches due to the higher inhibitor concentration and less ***,the coating with wide scratches displays enough inhibition ability as *** dual self-healing coating is a good alternative for Mg alloy parts in the practical applications.

关键词： Self-healing coating Micro-arc oxidation(mao)film Atmospheric corrosion Mg alloy Inhibitor Sediments

Effect of corrosive media on galvanic corrosion of complicated tri-metallic couples of 2024 Al alloy/Q235 mild steel/304 stainless steel

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2019年第9期35卷 1886-1893页

作者： Linjun Shi Xiuying Yang Yingwei Song Dan Liua kaihui dong Dayong Shan En-Hou Han Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology o f ChinaHefei 230026China Shenyang Institute of Technology Fushun 113122China

Galvanic corrosion of tri-metallic couples is more complicated than that of bi-metallic couples. In this study, the effect of the pH of corrosive media on the galvanic corrosion of 2024 A1 alloy/Q235 mild steel/304 stainless steel tri-metallic couples was investigated using potentiodynamic polarization, scanning electron microscopy, scanning vibrating electrode technique and a multi-channel galvanic corrosion meter. The results show that 2024 always acts as the only anode in 3.5 wt% NaCl at pH 5.56,9.72 and 12.0, while both Q235 and 2024 act as anodes at pH 2.39 in the initial stage and then the role of Q235 changes at longer coupling time, which can be attributed to the effect of pH on the surface film of 2024. It is also found that the galvanic current density of a tri-metallic couple is the superposition of two bi-metallic couples when cathodic reactions are controlled by the diffusion of oxygen, otherwise it is smaller than that of the sum of two bi-metallic couples. The localized corrosion instead of uniform corrosion of anodic metal is accelerated by galvanic corrosion.

关键词： Galvanic corrosion Tri-metallic couples Corrosive media Scanning vibrating electrode technique Zero resistance ammeter

Investigation of a novel self-sealing pore micro-arc oxidation film on AM60 magnesium alloy

在线全文

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2013年第1期1卷 82-87页

作者： Yingwei Song kaihui dong Dayong Shan En-Hou Han State Key Laboratory for Corrosion and Protection Institute of Metal ResearchChinese Academy of Sciences62 Wencui RoadShenyang 110016China

Micro-arc oxidation(MAO)is one of the promising methods to improve the corrosion resistance of magnesium ***,there are plenty of micro-pores in the traditional MAO films,deteriorating their protection property.A novel self-sealing pore MAO film was developed in this *** morphologies and chemical composition of the film were detected by scanning electron microscopy(SEM)and energy dispersive X-ray spectroscopy(EDX).The corrosion behavior was investigated by electrochemical and salt spray *** possible film formation and corrosion mechanisms were *** self-sealing pore film presents a blue *** of the micro-pores in the surface of the film are sealed during the film formation *** chemical composition of the film mainly contains Mg,O,Ti,F and *** self-sealing pore film exhibits better corrosion resistance compared with the traditional silicate ***,the self-sealing pore film keeps intact after salt spray test for 2000 h,which can be attributed to its high compactness.

关键词： Self-sealing pore Micro-arc oxidation film Magnesium alloy Corrosion resistance

Effect of hydrogen on the corrosion behavior of the Mg-xZn alloys

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2014年第3期2卷 208-213页

作者： Yingwei Song En-Hou Han kaihui dong Dayong Shan Chang dong Yim Bong Sun You Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Korea Institute of Materials Science Changwon 641-831Republic of Korea

Hydrogen evolution reaction is inevitable during the corrosion of Mg *** effect of hydrogen on the corrosion behavior of the Mg-2Zn and Mg-5Zn alloys is investigated by charging hydrogen *** surface morphologies of the samples after charging hydrogen were observed using a scanning electron microscopy(SEM)and the corrosion resistance was evaluated by polarization *** is found that there are oxide films formed on the surface of the charged hydrogen *** low hydrogen evolution rate is helpful to improve the corrosion resistance of Mg alloys,while the high hydrogen evolution rate can increases the defects in the films and further deteriorates their protection ***,the charging hydrogen effect is greatly associated with the microstructure of Mg substrate.

关键词： Charging hydrogen Corrosion resistance Mg-xZn alloys Oxide films

模拟海洋大气环境下钛铝连接件的电偶腐蚀研究

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

表面技术 2024年第9期53卷 11-21,I0005页

作者：董凯辉宋影伟蔡勇韩恩厚中国科学院金属研究所核用材料与安全评价重点实验室沈阳110016 中国科学技术大学材料科学与工程学院合肥230026 南方海洋科学与工程广东实验室(珠海) 广东珠海519000 广东腐蚀科学与技术创新研究院广州510530 华南理工大学材料科学与工程学院广州510641

目的探究海洋大气环境下飞机结构用钛铝连接件的电偶腐蚀行为,分析结构件各位置的电偶腐蚀差异,完善钛、铝金属间的电偶腐蚀机理。方法通过动电位极化曲线、零电阻电流(ZRA)及中性盐雾试验等,比较浸泡和薄液膜2种测试条件对腐蚀过程的... 详细信息

目的探究海洋大气环境下飞机结构用钛铝连接件的电偶腐蚀行为,分析结构件各位置的电偶腐蚀差异,完善钛、铝金属间的电偶腐蚀机理。方法通过动电位极化曲线、零电阻电流(ZRA)及中性盐雾试验等,比较浸泡和薄液膜2种测试条件对腐蚀过程的影响。利用有限元模拟(FEM)表征电偶作用在钛铝表面的影响范围,并预测各位置的腐蚀程度,最后通过腐蚀形貌和失重试验加以验证。结果在模拟海洋大气环境下钛及铝合金的阴极反应速率相较于浸泡条件下有所提高,耦合后两金属间的电偶电流密度由浸泡时的1.52μA/cm^(2)提升至11.00μA/cm^(2),腐蚀形态由局部点蚀凹坑转变为连续网格状腐蚀条纹。另外,钛与铝金属间的电偶电位(Eg=-700 mV,***)与阳极铝合金的自腐蚀电位(Ecorr,Al=-680 mV,***)接近,两者间较低的电位差使得电偶作用在铝表面的影响距离只有10~15 mm。结论钛铝连接件的电偶腐蚀主要集中在与钛直接接触的铝合金交界处,但不同边界位置的腐蚀深度也可能相差4倍以上,这主要与电偶作用影响范围内的阴/阳极面积比有关。

关键词：钛合金铝合金电偶腐蚀有限元模拟大气腐蚀薄液膜

不同离子对TC4钛合金电化学腐蚀行为的协同作用机制

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

金属学报 2023年第7期59卷 939-946页

作者：赵平平宋影伟董凯辉韩恩厚中国科学院金属研究所中国科学院核用材料与安全评价重点实验室沈阳110016 南方海洋科学与工程广东省实验室(珠海) 珠海519000

采用电化学方法研究了H^(+)、F^(-)及其2者协同作用加速TC4钛合金腐蚀的机制,以及添加Fe^(3+)后TC4钛合金腐蚀的缓蚀机理。结果表明,H^(+)对TC4钛合金表面钝化膜的破坏作用较小,而F^(-)对钝化膜破坏作用极大,尤其当F^(-)和H^(+)共存时... 详细信息

采用电化学方法研究了H^(+)、F^(-)及其2者协同作用加速TC4钛合金腐蚀的机制,以及添加Fe^(3+)后TC4钛合金腐蚀的缓蚀机理。结果表明,H^(+)对TC4钛合金表面钝化膜的破坏作用较小,而F^(-)对钝化膜破坏作用极大,尤其当F^(-)和H^(+)共存时协同加速TC4钛合金的腐蚀,但加入一定浓度的Fe^(3+)后,对TC4钛合金的腐蚀起到抑制作用,原因是Fe^(3+)加速阴极还原反应,使阳极从活化-钝化区转移到钝化区,同时溶液中Fe^(3+)通过络合作用消耗F^(-),减弱了F^(-)对钝化膜的破坏作用。

关键词：钛合金电化学腐蚀协同作用钝化膜离子

硅溶胶/植物纤维吸声材料的制备及其性能研究

在线全文

学校读者我要写书评

暂无评论

中国造纸 2020年第8期39卷 57-61页

作者：董凯辉王习文华南理工大学轻工科学与工程学院制浆造纸工程国家重点实验室广东广州510640

本研究提出一种以硅溶胶和杉木纤维为原料、采用泡沫成形法快速制备硅溶胶/植物纤维吸声材料的方法。结果表明,采用泡沫成形可以实现高蓬松度植物纤维基吸声材料的制备。另外,硅溶胶能够显著改善硅溶胶/植物纤维吸声材料的热稳定性和强... 详细信息

本研究提出一种以硅溶胶和杉木纤维为原料、采用泡沫成形法快速制备硅溶胶/植物纤维吸声材料的方法。结果表明,采用泡沫成形可以实现高蓬松度植物纤维基吸声材料的制备。另外,硅溶胶能够显著改善硅溶胶/植物纤维吸声材料的热稳定性和强度,与未添加硅溶胶的样品相比,当硅溶胶添加量为8%时,硅溶胶/植物纤维吸声材料的密度仅为20.21 kg/m3,而弹性模量和屈服强度分别从15.4 kPa和1.6 kPa提高到了86.2 kPa和4.4 kPa;硅溶胶/植物纤维吸声材料对5000 Hz以上声波的吸声系数达到了0.65。

关键词：硅溶胶植物纤维吸声材料

GW93镁合金点蚀过程的原位监测及点蚀机制

在线全文

学校读者我要写书评

暂无评论

中国材料进展 2020年第2期39卷 85-91,112页

作者：宋影伟樊志民董凯辉单大勇韩恩厚中国科学院金属研究所核用材料与安全评价重点实验室

镁合金作为最轻的金属结构材料有很多优异性能,但镁自身化学性质活泼,耐蚀性差,尤其易发生点蚀,破坏性和隐患性非常大。若想降低点蚀对镁合金部件安全服役性能的影响,就需要对镁合金点蚀机制有清楚的认识。然而,适用于其他金属材料的经... 详细信息

镁合金作为最轻的金属结构材料有很多优异性能,但镁自身化学性质活泼,耐蚀性差,尤其易发生点蚀,破坏性和隐患性非常大。若想降低点蚀对镁合金部件安全服役性能的影响,就需要对镁合金点蚀机制有清楚的认识。然而,适用于其他金属材料的经典的点蚀机制是以形成氧浓差电池为基础,阴极发生的是氧还原反应,而镁合金阴极发生的是析氢反应,因此镁合金的点蚀形成过程尚需深入研究。采用扫描振动电极技术(SVET)原位监测了铸态GW93镁合金在3. 5%NaCl(质量分数)溶液中的点蚀过程,采用SEM观察了腐蚀过程镁合金微观形貌变化,采用电流-时间曲线对比了阴阳极电位对点蚀发展的影响。研究结果表明,点蚀坑外是微阴极,发生析氢反应,点蚀坑内是微阳极,发生镁的溶解反应,随着时间增加,点蚀发展过程是动态变化的。镁合金中第二相所导致的微电偶腐蚀加速效应及氯离子在腐蚀坑内的聚集,两者的协同作用驱动了点蚀不断向基体内部生长。

关键词：镁合金点蚀第二相扫描振动电极原位监测

在线全文

学校读者我要写书评

暂无评论

纤维尺寸对纤维悬浮液屈服应力的影响

中国造纸学报 2018年第1期33卷 27-31页

作者：王晨马若腾董凯辉薛智轩张辉南京林业大学江苏省制浆造纸科学与技术重点实验室江苏南京210037 南京林业大学江苏省林业资源高效加工利用协同创新中心江苏南京210037

利用桨式转子流变仪测量并对比分析了4种不同尺寸尼龙纤维悬浮液在相同体积浓度和集聚因子时的屈服应力,以及2种尼龙纤维按不同比例混合后对悬浮液屈服应力的影响。结果表明,体积浓度相同时,形状系数较大的纤维悬浮液的屈服应力也较大,... 详细信息

利用桨式转子流变仪测量并对比分析了4种不同尺寸尼龙纤维悬浮液在相同体积浓度和集聚因子时的屈服应力,以及2种尼龙纤维按不同比例混合后对悬浮液屈服应力的影响。结果表明,体积浓度相同时,形状系数较大的纤维悬浮液的屈服应力也较大,但形状系数对屈服应力与体积浓度的幂率关系中的乘数项系数和指数项系数未表现出规律性影响;屈服应力不能由单一集聚因子的函数来表示,集聚因子相同时,纤维形状系数较小的悬浮液的屈服应力更大;2种尼龙纤维混合后,屈服应力随形状系数较大的纤维在混合纤维悬浮液中体积分数的减小而呈线性递减趋势。

关键词：非牛顿流体尼龙纤维纤维悬浮液屈服应力集聚因子