检索结果-南通市图书馆

Nafion/polypyrrole and Nafion/DMSO Organic Coatings for Magnesium Protection

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2007年第1期23卷 139-141页

作者： renguo song Xiaohua ZHENG Carsten Blawer Wolfgang Dietzel The MOE Key Laboratory of Mechanical Manufacture and Automation Zhejiang University of Technology Hangzhou 310014 China Center for Magnesium Technology Institute of Materials Research GKSS-Forschungszentrum Geesthacht GmbH Max-Planck Straβe 1 D-21502 Geesthacht Germany

Nafion/polypyrrole and Nafion/Dimethysulfoxid （DMSO） organic coatings were prepared on the surface of pure magnesium by simple immersion and heat treatment. The morphologies and corrosion resistance of the organic coatings were investigated by using optical microscopy and electrochemical corrosion testing, respectively. It is shown that Nafion/polypyrrole organic coatings resulted in the corrosion resistance of magnesium decreasing; while Nafion/DMSO organic coatings can effectively improve the corrosion resistance of magnesium. Also, the corrosion resistance increased with the thickness of the Nafion/DMSO organic coating increased.

关键词： Magnesium Naflon/polypyrrole organic coatings Naflon/DMSO organic coatings Corrosion resistance

恒压恒流交互模式对AZ31B镁合金微弧氧化陶瓷膜组织与性能的影响

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

材料保护 2024年第2期57卷 35-42页

作者：束银凤姜波王超宋仁国常州大学材料科学与工程学院江苏常州213164 常州大学江苏省材料表面科学与技术重点实验室江苏常州213164

为探究恒压与恒流相互叠加模式对AZ31B镁合金微弧氧化膜层组织与性能的影响,利用AZ31B镁合金为基材,在电解液和电参数相同的前提下,采用恒流、恒压、先恒流再恒压、先恒压再恒流4种不同电源工作模式在AZ31B镁合金表面制备微弧氧化陶瓷... 详细信息

为探究恒压与恒流相互叠加模式对AZ31B镁合金微弧氧化膜层组织与性能的影响,利用AZ31B镁合金为基材,在电解液和电参数相同的前提下,采用恒流、恒压、先恒流再恒压、先恒压再恒流4种不同电源工作模式在AZ31B镁合金表面制备微弧氧化陶瓷膜。采用扫描电镜(SEM)、电化学工作站、X射线衍射仪(XRD)、高温摩擦磨损机等检测手段,对AZ31B镁合金微弧氧化陶瓷膜层进行测试。结果表明:基材经微弧氧化处理后,表面生成微弧氧化陶瓷膜。在先恒流再恒压(0.7 A/6 min+400 V/4 min)电源模式下制备的微弧氧化陶瓷膜的MgO、MgF_(2)以及Mg_(2)SiO_(4)等强化相的峰值比其他模式下制备的膜层高;膜层表面平整,微孔小且分布均匀,致密性较好,膜层与基体紧密结合;相对于其他模式下的膜层,其被磨穿时长最长,材料的耐磨性得到提升;其腐蚀电位相对于基体,从-1.4974 V增加到-1.3769 V,腐蚀速率从0.0091 mm/a降低到0.0020 mm/a,耐腐蚀性显著提升。

关键词： AZ31B 镁合金恒压恒流交互微弧氧化组织性能

GRAIN　BOUNDARY　SEGREGATION　AND　INTERGRANULAR　BRITTLENESS　IN　HIGH　STRENGTH　ALUMINIUM　ALLOY

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 1995年第3期5卷 97-100页

作者： song, renguo Zheng, Meiguang Northeastern Univ Shenyang China

ＧＲＡＩＮＢＯＵＮＤＡＲＹＳＥＧＲＥＧＡＴＩＯＮＡＮＤＩＮＴＥＲＧＲＡＮＵＬＡＲＢＲＩＴＴＬＥＮＥＳＳＩＮＨＩＧＨＳＴＲＥＮＧＴＨＡＬＵＭＩＮＩＵＭＡＬＬＯＹ￥Ｓｏｎｇ，Ｒｅｎｇｕｏ；Ｚｈｅｎｇ，Ｍｅｉｇｕａｎｇ（Ｄ... 详细信息

ＧＲＡＩＮＢＯＵＮＤＡＲＹＳＥＧＲＥＧＡＴＩＯＮＡＮＤＩＮＴＥＲＧＲＡＮＵＬＡＲＢＲＩＴＴＬＥＮＥＳＳＩＮＨＩＧＨＳＴＲＥＮＧＴＨＡＬＵＭＩＮＩＵＭＡＬＬＯＹ￥Ｓｏｎｇ，Ｒｅｎｇｕｏ；Ｚｈｅｎｇ，Ｍｅｉｇｕａｎｇ（ＤｅｐａｒｒｍｅｎｔｏｆＭａｔｅｒｉ...

关键词： high strength aluminium alloy grain boundary segregation intergranular brittleness

Aging Characteristics, Stress Corrosion Behaviour and Role of Mg Segregation at Grain Boundary in 7175High-strength Al Alloy

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 1998年第3期14卷 259-264页

作者： song, renguo Geng, Ping Zeng, Meiguang Zhang, Baojin Northeastern Univ Coll Sci Dept Mat Sci Shenyang 110006 Peoples R China

The aging characteristics, stress corrosion behavior and chemical composition of grain boundary in 7175 high-strength Al alloy during long term aging process have been investigated by hardness measurement, constant elongation rate testing (CERT) and energy spectroscopy analysis. The results indicate that double peaks in aged state feature the hardness and strength of 7175 Al alloy. Although the intensity of double peaks is almost equal, the stress corrosion resistance in the second peak-aged state is better than that of the first peak-aged state. The effects of Mg segregation on the binding energy of grain boundary have been calculated by using free electron theory developed in this paper. The results showed that Mg segregation plays a significant role in controlling stress corrosion susceptibility, which is consistent with the experimental results. (Edited author abstract) 32 Refs.

关键词： Aluminum alloys

Corrosion Protection of AM50 Magnesium Alloy by Nafion/DMSO Organic Coatings

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2008年第2期23卷 204-206页

作者： song renguo ZHENG Xiaohua BAI Shuju BLAWERT Carsten DIETZEL Wolfgang The MOE Key Laboratory of Mechanical Manufacture and Automation Zhejiang University of Technology Hangzhou 310014 China Tieling Base Property Company of NEPPC Tieling 112001 China Institute of Materials Research GKSS-Forschungszentrum Geesthacht GmbH Geesthacht D-21502 Germany

为 AM50 镁合金的器官的涂层由简单沉浸和热处理准备了的 Nafion/Dimethysulfoxid (DMSO ) 的腐蚀保护的有效性被调查。它 Nafion/DMSO 器官的涂层的腐蚀抵抗和形态学被电气化学的腐蚀测试和光显微镜学学习。结果证明 Nafion/DMSO 器官... 详细信息

为 AM50 镁合金的器官的涂层由简单沉浸和热处理准备了的 Nafion/Dimethysulfoxid (DMSO ) 的腐蚀保护的有效性被调查。它 Nafion/DMSO 器官的涂层的腐蚀抵抗和形态学被电气化学的腐蚀测试和光显微镜学学习。结果证明 Nafion/DMSO 器官的涂层能有效地改进 AM50 镁合金的腐蚀抵抗。另外，腐蚀抵抗与器官的涂层的表面密度增加。

关键词：镁合金腐蚀保护有机涂层金属表面防护

Effect of Current Density on Microstructure and Corrosion Behavior of Plasma Electrolytic Oxidation Coated 6063 Aluminum Alloy

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2018年第6期33卷 1503-1510页

作者：庄俊杰宋仁国 ZHENG Chuanbo School of Materials Science and Engineering Changzhou University Jiangsu Key Laboratory of Materials Surface Science and Technology Changzhou University Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering Changzhou University School of Materials Science and Engineering Jiangsu University of Science and Technology

Plasma electrolytic oxidation(PEO) coatings were fabricated on 6063 aluminum alloy in a cheap and convenient electrolyte. The effect of different current densities, i e, 5, 10, 15, and 20 A/dm2on the microstructure and corrosion behavior of coatings was comprehensively studied by scanning electron microscopy(SEM), stereoscopic microscopy, potentiodynamic polarization and electrochemical impedance spectroscopy(EIS), respectively. It is found that the pore density decreases and the pore size increases with increasing current density. The XRD results show that the coatings are only composed of α-Al2O3and γ-Al2O3. Potentiodynamic polarization test proves that the coating formed under 10 A/dm2possesses the best anticorrosion property. The long time EIS test shows that the coating under 10 A/dm2is able to protect the aluminum alloy substrate after long time of immersion in 0.59 M NaCl solution, which confirms the salt solution immersion test results in 2 M NaCl solution.

关键词： coating 6063 aluminum alloy plasma electrolytic oxidation (PEO) current density corrosion resistance

Effects of Aging Treatment on Intergranular Corrosion and Stress Corrosion Cracking Behavior of AA7003

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2018年第5期33卷 1198-1204页

作者：张晓燕宋仁国 SUN Bin School of Materials Science and Engineering Changzhou University Jiangsu Key Laboratory of Materials Surface Science and Technology Changzhou University Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering Changzhou University

In order to study the effects of aging treatment on the intergranular corrosion（IGC） and stress corrosion cracking（SCC） of 7003 aluminum alloy（AA7003）, the intergranular corrosion test, electrochemical test and slow strain rate test（SSRT）, combined with optical microscopy（OM） and scanning electron microscopy（SEM） as well as transmission electron microscopy（TEM） observations have been carried out. The IGC and electrochemical test results showed that the IGC resistance of AA7003 for peak aged（PA） temper is the lowest, with double peak aged（DPA） the moderate, and retrogression and re-aging（RRA） the highest among three tempers, which is attributed to the continuous feature of precipitation on grain boundary of PA temper and the interrupted feature of precipitation on grain boundary of DPA and RRA tempers, as well as the wide precipitation free zones（PFZ） of RRA temper. In addition, the SSRT results indicated that all three tempers AA7003 are susceptible to SCC in IGC solution, and the change tendency of SCC susceptibility（ISCC） of AA7003 for three tempers follows the order： ISCC（RRA）

关键词： AA7003 aging treatment intergranular corrosion stress corrosion cracking

Localized Corrosion and Stress Corrosion Cracking Behavior of AA7003 in a 3.5 wt% NaCl Aqueous Solution

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2020年第5期35卷 986-995页

作者：祁星 SUN Bin CHEN Xiaoming 宋仁国 School o f Materials Science and Engineering Changzhou UniversityChangzhou 213164China Jiangsu Key Laboratory o f Materials Surface Science and Technology Changzhou UniversityChangzhou 213164China Jiangsu Collaborative Innovation Center o f Photovolatic Science and Engineering Changzhou UniversityChangzhou 213164China Key Laboratory o f Research on Hydraulic and Hydro-Power Equipment Surface Engineering Technology1 o f Zhejiang Province Hangzhou 310012China

The microstructure,localized corrosion (LC) and stress corrosion cracking (SCC) behavior of 7003 aluminum alloy (AA7003) under various aging treatments (peak aging (PA),double peak aging (DPA),regression and re-aging (RRA)) were investigated by means of transmission electron microscope (TEM),scanning electron microscopy (SEM),electrochemical impendence spectroscopy (EIS) and slow strain rate tensile test.The results of TEM showed a discontinuous distribution of grain boundary precipitates of AA7003 under DPA and RRA treatments,which is beneficial for increasing the resistance of LC and SCC.Meanwhile,LC was found initiating firstly on intermetallics which caused the dissolution of surrounding matrix,then pitting holes were formed and developed into matrix.In addition,the SCC process of AA7003 could be divided into two stages,i e,initial pre-cracking and breeding cracking.The EIS analysis,cross-section morphologies and fracture surfaces of specimens indicated that DPA and RRA treatments significantly decreased the crack growth rate during breeding cracking stage,especially for RRA treatment.

关键词： 7003 aluminum alloy localized corrosion stress corrosion cracking

Al-4.14Cu-1.51Li合金均匀化工艺研究

在线全文

学校读者我要写书评

暂无评论

热加工工艺 2023年第20期52卷 128-133,139页

作者：汪兵宋仁国姜波王超常州大学材料科学与工程学院江苏常州213164 常州大学江苏省材料表面科学与技术重点实验室江苏常州213164

以自行熔铸的铝铜锂合金为研究对象,利用扫描电镜、金相显微镜等研究其均匀化工艺。实验结果表明:其铸态合金有明显的枝晶结构,且具有Al_(2)Cu、Al_(2)CuMg等粗大第二相。一级均匀化后,粗大相并无显著减少。另外最佳二级均匀化工艺是460... 详细信息

以自行熔铸的铝铜锂合金为研究对象,利用扫描电镜、金相显微镜等研究其均匀化工艺。实验结果表明:其铸态合金有明显的枝晶结构,且具有Al_(2)Cu、Al_(2)CuMg等粗大第二相。一级均匀化后,粗大相并无显著减少。另外最佳二级均匀化工艺是460℃/8 h+515℃/24 h,此时粗大相大幅减少,残留的是AlCu相以及可能的Al_(2)Cu相和AlCuFeMn相聚集体;且经过均匀化动力学验证,第二级均匀化时间与实验结果相匹配。

关键词： Al-4.14Cu-1.51Li合金均匀化动力学检验