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Influence of Production Sequence of Aluminum Alloy Hot Rolling on Strip Surface Quality
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作者 Hui Song Weixuan Jiang 《Frontiers of Metallurgical Industry》 2024年第1期12-14,共3页
With the intensification of market competition in the aluminum alloy strip processing industry,it is dif-ficult to control the mass production of the same specifications,which is bound to affect the hot rolling produc... With the intensification of market competition in the aluminum alloy strip processing industry,it is dif-ficult to control the mass production of the same specifications,which is bound to affect the hot rolling production.This paper studied the effect of the hot rolling order of aluminum alloy on the surface quality of strip,such as roll printing,color difference,anodic oxidation,etc.,reasonable discharge sequence and corresponding optimization measures were formulated. 展开更多
关键词 hot rolling production sequence surface quality aluminum alloy chromate treatment
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Cu-Zn-based alloy/oxide interfaces for enhanced electroreduction of CO_(2) to C_(2+) products 被引量:5
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作者 Zi-Yang Zhang Hao Tian +3 位作者 Lei Bian Shi-Ze Liu Yuan Liu Zhong-Li Wang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2023年第8期90-97,I0004,共9页
The electrochemical CO_(2)reduction reaction to produce multi-carbon(C_(2+)) hydrocarbons or oxygenate compounds is a promising route to obtain a renewable fuel of high energy density.However,producing C_(2+)at high c... The electrochemical CO_(2)reduction reaction to produce multi-carbon(C_(2+)) hydrocarbons or oxygenate compounds is a promising route to obtain a renewable fuel of high energy density.However,producing C_(2+)at high current densities is still a challenge.Herein,we develop a Cu-Zn alloy/Cu-Zn aluminate oxide composite electrocatalytic system for enhanced conversion of CO_(2)to C_(2+)products.The Cu-Zn-Al-Layered Double Hydroxide(LDH) is used as a precursor to decompose into uniform Cu-Zn oxide/Cu-Zn aluminate pre-catalyst.Under electrochemical reduction,Cu-Zn oxide generates Cu-Zn alloy while Cu-Zn aluminate oxide remains unchanged.The alloy and oxide are closely stacked and arranged alternately,and the aluminate oxide induces the strong electron interaction of Cu,Zn and Al,creating a large number of highly active reaction interfaces composed of 0 to+3 valence metal sites.With the help of the interface effect,the optimized Cu_(9)Zn_(1)/Cu_(0.8)Zn_(0.2)Al_(2)O_(4)catalyst achieves a Faradaic efficiency of 88.5% for C_(2+)products at a current density of 400 mA cm^(-2)at-1.15 V versus reversible hydrogen electrode.The in-situ Raman and attenuate total reflectance-infrared absorption spectroscopy(ATR-IRAS) spectra show that the aluminate oxide at the interface significantly enhances the adsorption and activation of CO_(2)and the dissociation of H2O and strengthens the adsorption of CO intermediates,and the alloy promotes the C-C coupling to produce C_(2+)products.This work provides an efficient strategy to construct highly active reaction interfaces for industrial-scale electrochemical CO_(2)RR. 展开更多
关键词 Electrochemical CO_(2)reduction reaction C_(2+)products Cu-Zn alloy Cu-Zn aluminate oxide Interface
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Clean production of Fe-based amorphous soft magnetic alloys via smelting reduction of high-phosphorus iron ore and apatite
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作者 Hua Zhang Tuoxiao Wang +5 位作者 Guoyang Zhang Wenjie Wu Long Zhao Tao Liu Shuai Mo Hongwei Ni 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2023年第12期2356-2363,共8页
Separated preparation of prealloys and amorphous alloys results in severe solidification-remelting and beneficial element removal-readdition contradictions,which markedly increase energy consumption and emissions.This... Separated preparation of prealloys and amorphous alloys results in severe solidification-remelting and beneficial element removal-readdition contradictions,which markedly increase energy consumption and emissions.This study offered a novel strategy for the direct production of FePC amorphous soft magnetic alloys via smelting reduction of high-phosphorus iron ore(HPIO)and apatite.First,the thermodynamic conditions and equilibrium states of the carbothermal reduction reactions in HPIO were calculated,and the element content in reduced alloys was theoretically determined.The phase and structural evolutions,as well as element migration and enrichment behaviors during the smelting reduction of HPIO and Ca_(3)(PO_(4))_(2),were then experimentally verified.The addition of Ca_(3)(PO_(4))_(2)in HPIO contributes to the enrichment of the P element in reduced alloys and the subsequent development of Fe_(3)P and Fe_(2)P phases.The content of P and C elements in the range of 1.52 wt% -14.63 wt% and 0.62 wt% -2.47 wt%,respectively,can be well tailored by adding 0-50 g Ca_(3)(PO_(4))_(2)and controlling the C/O mole ratio of 0.8-1.1,which is highly consistent with the calculated results.These FePC alloys were then successfully formed into amorphous ribbons and rods.The energy consumption of the proposed strategy was estimated to be 2.00×10^(8) kJ/t,which is reduced by 30% when compared with the conventional production process.These results are critical for the comprehensive utilization of mineral resources and pave the way for the clean production of Fe-based amorphous soft magnetic alloys. 展开更多
关键词 high-phosphorus iron ore smelting reduction structural evolution Fe-based amorphous alloy clean production
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Mesoporous Carbon Nanofibers Loaded with Ordered PtFe Alloy Nanoparticles for Electrocatalytic Nitrate Reduction to Ammonia
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作者 XIE Meng LUO Wei QIU Pengpeng 《Journal of Donghua University(English Edition)》 CAS 2024年第4期365-376,共12页
Highly dispersed bimetallic alloy nanoparticle electrocatalysts have been demonstrated to exhibit exceptional performance in driving the nitrate reduction reaction(NO_(3)RR)to generate ammonia(NH_(3)).In this study,we... Highly dispersed bimetallic alloy nanoparticle electrocatalysts have been demonstrated to exhibit exceptional performance in driving the nitrate reduction reaction(NO_(3)RR)to generate ammonia(NH_(3)).In this study,we prepared mesoporous carbon nanofibers(mCNFs)functionalized with ordered PtFe alloys(O-PtFe-mCNFs)by a composite micelle interface-induced co-assembly method using poly(ethylene oxide)-block-polystyrene(PEO-b-PS)as a template.When employed as electrocatalysts,O-PtFe-mCNFs exhibited superior electrocatalytic performance for the NO_(3RR)compared to the mCNFs functionalized with disordered PtFe alloys(D-PtFe-mCNFs).Notably,the NH_(3)production performance was particularly outstanding,with a maximum NH_(3)yield of up to 959.6μmol/(h·cm~2).Furthermore,the Faraday efficiency(FE)was even 88.0%at-0.4 V vs.reversible hydrogen electrode(RHE).This finding provides compelling evidence of the potential of ordered PtFe alloy catalysts for the electrocatalytic NO_(3)RR. 展开更多
关键词 ordered PtFe alloy mesoporous carbon nanofiber(mCNF) nitrate reduction reaction(NO3RR) ammonia(NH3)production reaction
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Microstructure evolution of aluminum-lithium alloy 2195 undergoing commercial production 被引量:12
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作者 蒋呐 高翔 郑子樵 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第5期740-745,共6页
Microstructures of three kinds of typical product states for commercially fabricated alloy 2195 were observed.It is found that the hot-rolled plate is characterized by a fibrous structure containing fine,polygonized s... Microstructures of three kinds of typical product states for commercially fabricated alloy 2195 were observed.It is found that the hot-rolled plate is characterized by a fibrous structure containing fine,polygonized substructures;and the cold-rolled sheet was characterized by a "pan-caked" grain structure containing high density dislocation cells.The product under near peak-aging temper is proved to contain a large amount of dispersive,plate-shaped T1(Al2CuLi) precipitates,together with a small fraction of θ'(Al2Cu) plates,exhibiting a desirable combination of mechanical properties.Analyses using scanning electron microscopy reveal that many coarse,irregular-shaped Al7Cu2Fe constituent particles exist in all product states,which indicates that intermediate heat treatments have little influence on this iron-caused,detrimental phase.The formation and evolution of microstructures for different product states of alloy 2195 were discussed in view point of the commercial production condition. 展开更多
关键词 Al-Li alloy commercial production microstructure evolution ROLLING heat treatment
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A homogenous microstructural Mg-based matrix model for orthopedic application with generating uniform and smooth corrosion product layer in Ringer’s solution:Study on biodegradable behavior of Mg-Zn alloys prepared by powder metallurgy as a case 被引量:4
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作者 Yang Yan Xin Chu +7 位作者 Xier Luo Xuemei Xu Yu Zhang YiLong Dai Ding Li Liangjian Chen Tao Xiao Kun Yu 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2021年第1期225-240,共16页
For high corrosion resistance and extensively modified biodegradable Mg-based alloys and composites for bone implants,a new Mgbased matrix model prepared by powder metallurgy is discussed and developed.In this researc... For high corrosion resistance and extensively modified biodegradable Mg-based alloys and composites for bone implants,a new Mgbased matrix model prepared by powder metallurgy is discussed and developed.In this research,Mg-5 wt.%Zn alloys were selected as a case.And they were impacted by hot extrusion and aging treatments to construct microstructure with different characteristics.Their selfforming corrosion product layer in Ringer’s solution,biodegradable behavior and corrosion mechanism were minutely investigated by in vitro degradation,electrochemical corrosion and cytocompatibility.The results demonstrated the extruded Mg-5 wt.%Zn alloy aged for 96 h showed high corrosion resistance,good biocompatibility for L929 and excellent ability of maintaining sample integrity during the immersion.Significantly,the alloy showed fine-grain microstructure and uniform distributed hundred nano-sized second phases,which promoted the formation of the uniform and smooth corrosion product layer at the beginning of immersion.The corrosion product layer was more stable in chloride containing aqueous solution and could be directly formed and repaired quickly,which effectively protected the matrix from further corrosion.In addition,an ideal model of Mg-based matrix for bone tissue engineering was tried to presume and propose by discussing the causal relationship between microstructure and bio-corrosion process. 展开更多
关键词 Magnesium alloys Powder metallurgy Second phase Corrosion product layer Biodegradable behavior CYTOCOMPATIBILITY
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Theoretical and experimental investigation of Ti alloy powder production using low-power plasma torches 被引量:1
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作者 Emre YURTKURAN Rahmi ÜNAL 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2022年第1期175-191,共17页
This study was carried out to investigate the possibility of titanium alloy metal powder production using low-power plasma torches.An argon DC non-transferred arc plasma torch was designed,and numerical analysis was c... This study was carried out to investigate the possibility of titanium alloy metal powder production using low-power plasma torches.An argon DC non-transferred arc plasma torch was designed,and numerical analysis was conducted to determine the plasma jet properties and wire temperature.The highest velocities inside the nozzle attachment were between 838 and 1178 m/s.The velocities of the jets at the apex were between 494 and 645 m/s for different gas flow rates.The studied plasma gas flow rates had no significant effect on the effective plasma jet length.It was shown that the plasma jet length can be estimated by numerical analysis using the temperature and velocity changes of the plasma jet over distance.It was observed that the powders produced were spherical without any satellites.As a result of this study,a plasma torch was developed and powder production was performed successfully by using relatively low torch power. 展开更多
关键词 plasma atomization particle size powder production thermal plasma torch Ti alloy powder computational fluid dynamics microstructure
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Wettability of CuNi-Ti Alloys on Si_3N_4 and Interfacial Reaction Products 被引量:1
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作者 Chuangeng WAN Huaping XIONG and Zhenfeng ZHOU (Dept. of Materials Science and Engineering, Jilin University of Technology, Changchun 130025, China)(To whom correspondence should be addressed) 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 1996年第3期219-222,共4页
Based on the alloy Cu55Ni45 (at pct), holding the proportion of Cu to Ni in constant and in the temperature range of 1233~1573 K, the wetting angles of CuNi-0~56 at pct Ti alloys on Si3N4 have been measured by the ses... Based on the alloy Cu55Ni45 (at pct), holding the proportion of Cu to Ni in constant and in the temperature range of 1233~1573 K, the wetting angles of CuNi-0~56 at pct Ti alloys on Si3N4 have been measured by the sessile drop method. With the increase of Ti content, the wetting angles decreased. The equilibrium wetting angle was 5° when Ti content ≥32 at pct.In the case of same Ti content, the activity of Ti in CuNiTi alloy was weaker than that in CuTi alloy The cross-section of the CuNiTi-Si3N4 interface and the elements distribution were examined by scanning electron microscope with X-ray wave-dispersion spectrometer, and the reaction products formed at the interface were determined by X-ray diffiaction analysis method. 展开更多
关键词 SI Ni Wettability of CuNi-Ti alloys on Si3N4 and Interfacial Reaction products TI
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CO-DEPOSITION OF Li(Ⅰ)WITH RE(Ⅲ)AND ITS APPLICATION IN THE PRODUCTION OF Al-Li-Cu-RE ALLOY BY MOLTEN SALT ELECTROLYSIS
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作者 Kai Guo CHANG Min Shou ZHAO Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022 《Chinese Chemical Letters》 SCIE CAS CSCD 1991年第2期163-166,共4页
The possibility of co-deposition of Li(Ⅰ)and RE(Ⅲ)has been estimated by both theoretical analysis and experimental study on the influences of temperature and concen- tration of chloride on the deposition potential.B... The possibility of co-deposition of Li(Ⅰ)and RE(Ⅲ)has been estimated by both theoretical analysis and experimental study on the influences of temperature and concen- tration of chloride on the deposition potential.Both the electrochemical and electrolytic results clearly show that Li(Ⅰ)and RE(Ⅲ)can co-deposit on the Al-Cu electrode under selected conditions. 展开更多
关键词 LI AND ITS APPLICATION IN THE productION OF Al-Li-Cu-RE alloy BY MOLTEN SALT ELECTROLYSIS WITH RE Al CU ITS
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Studying Cu Alloy Corrosion Products in Cooling Liquid
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作者 A.A .El-Meligi National Research Centre, Physical Chem. Dept., Dokki, Cairo, Egypt 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2001年第5期507-510,共4页
The effect of cooling liquid used for heat exchangers on the Cu alloy corrosion products has been examined using potential-time measurements under applied current condition (anodizing), potentiodynamic polarization, X... The effect of cooling liquid used for heat exchangers on the Cu alloy corrosion products has been examined using potential-time measurements under applied current condition (anodizing), potentiodynamic polarization, X-ray diffraction (XRD) and infrared spectroscopy (IR) The corrosion products formed on the Cu alloy surface during anodizing, are Cu2O, Cu2(OH)3Cl, and Cu2S. NaCl is detected in the corrosion products. The film formation depends on the applied current and the shift of potential to nobler direction indicates its formation progress. 展开更多
关键词 CU Studying Cu alloy Corrosion products in Cooling Liquid
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Development of nitrogen-alloyed stainless steel sheet products in Baosteel
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作者 JIANG Laizhu~(1,2)) and LOU Dingbo~(2)) 1) Research Institute,Baoshan Iron & Steel Co.,Ltd.,Shanghai 201900,China 2) Stainless Steel Business Unit,Baoshan Iron & Steel Co.,Ltd.,Shanghai 200431,China 《Baosteel Technical Research》 CAS 2010年第S1期80-,共1页
Nitrogen plays a vitally important role for improving properties for stainless steels in many aspects.In this paper,the physical metallurgy behavior and the beneficial effects of nitrogen on corrosion resistance and o... Nitrogen plays a vitally important role for improving properties for stainless steels in many aspects.In this paper,the physical metallurgy behavior and the beneficial effects of nitrogen on corrosion resistance and other mechanical properties of stainless steels were summarised.Based on nitrogen alloying,various stainless steel products,such as austenitic,duplex and martensitic staniless steels were developed with enhanced properties,such as corrosion resistance,mechanical strength and weldability,among other things. 展开更多
关键词 nitrogen-alloyed stainless steel corrosion resistance product
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时效态WE43合金表面腐蚀产物膜的显微组织
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作者 蔡勇 陈翌鹏 +1 位作者 闫宏 陈荣石 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2024年第5期1487-1495,共9页
时效态WE43合金在3.5 wt.%NaCl溶液中形成了致密且具有3层结构的腐蚀产物膜。采用透射电子显微镜分析膜层的显微组织。保护性膜层为3层结构,从内到外依次为RE_(2)O_(3)层、MgO与RE_(2)O_(3)的混合层和Mg(OH)2与RE_(2)O_(3)的混合层。析... 时效态WE43合金在3.5 wt.%NaCl溶液中形成了致密且具有3层结构的腐蚀产物膜。采用透射电子显微镜分析膜层的显微组织。保护性膜层为3层结构,从内到外依次为RE_(2)O_(3)层、MgO与RE_(2)O_(3)的混合层和Mg(OH)2与RE_(2)O_(3)的混合层。析出相和稀土元素通过外氧化的方式形成大量稀土氧化物颗粒,这是保护性膜层形成的主要原因。RE_(2)O_(3)与MgO存在以下择优位向关系:(211)晶面和[231]晶向分别与MgO的(002)晶面和[110]晶向平行。因此,稀土氧化物颗粒可以填补疏松MgO膜层的空隙,从而提高了膜层的致密性。内层的RE_(2)O_(3)和MgO与RE_(2)O_(3)的混合层对于保护性膜层的形成起到了重要作用。致密的内层腐蚀产物膜能阻止腐蚀介质与镁基体发生反应。 展开更多
关键词 镁合金 腐蚀产物膜 高分辨透射电镜 析出相 氧化
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一种能温和产氢且具有高活性保持能力的Al-Bi-Zn基复合粉体
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作者 王翠萍 余方拯 +6 位作者 黄岩 王明帅 邓睿 郭毅慧 张锦彬 杨水源 刘兴军 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2024年第5期1427-1440,共14页
通过相图计算和气体雾化的方法,设计并制备Al-10Bi-7Zn和Al-10Bi-7Zn-1.5X (X:Cu, Fe, Ni)(质量分数,%)复合粉体。研究Cu、Fe和Ni对Al-Bi-Zn基复合粉体水解制氢性能的影响。通过X射线衍射(XRD)和扫描电子显微镜(SEM)以及能量色散谱(EDS... 通过相图计算和气体雾化的方法,设计并制备Al-10Bi-7Zn和Al-10Bi-7Zn-1.5X (X:Cu, Fe, Ni)(质量分数,%)复合粉体。研究Cu、Fe和Ni对Al-Bi-Zn基复合粉体水解制氢性能的影响。通过X射线衍射(XRD)和扫描电子显微镜(SEM)以及能量色散谱(EDS)分析对粉体的组成和形貌进行表征。水解制氢性能测试结果表明,添加Cu、Fe或Ni可以改变Al-10Bi-7Zn三元合金复合粉体的制氢速率,并且提高其抗氧化性能。在四元复合粉体体系中,Al-10Bi-7Zn-1.5Ni表现出最佳的制氢性能,在60℃下与蒸馏水反应时,500 min内的产氢率为75.3%(954.1 m L/g),在储存7 d后(30℃,相对湿度60%),1500 min内保持57.9%(733.7 m L/g)的产氢率。此外,机理研究表明,在Al-Bi-Zn基复合粉体中添加Cu、Fe或Ni可以稳定Al基体,抑制复合粉体在空气中的开裂,保持粉体的高活性。 展开更多
关键词 铝合金 气雾化 水解反应 制氢 抗氧化
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825合金在含单质硫高温高酸性环境中的局部腐蚀行为
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作者 唐庚 周朗 +3 位作者 李祚龙 龚浩 李玉飞 曾德智 《机械工程材料》 CAS CSCD 北大核心 2024年第9期61-66,共6页
在132℃、H_(2)S分压4.8MPa、CO_(2)分压1.6MPa、氯离子质量浓度42750mg·L^(-1)的气田模拟地层水中,通过腐蚀挂片试验研究了825合金在含单质硫(每升地层水中包裹合金的单质硫质量为10g)与不含单质硫条件下的局部腐蚀行为。结果表明... 在132℃、H_(2)S分压4.8MPa、CO_(2)分压1.6MPa、氯离子质量浓度42750mg·L^(-1)的气田模拟地层水中,通过腐蚀挂片试验研究了825合金在含单质硫(每升地层水中包裹合金的单质硫质量为10g)与不含单质硫条件下的局部腐蚀行为。结果表明:在不含单质硫条件下825合金几乎不发生腐蚀,腐蚀6d时的腐蚀速率仅为0.0077mm·a^(-1);添加单质硫腐蚀3d时腐蚀速率达到0.0552mm·a^(-1),合金发生了严重的局部腐蚀,随腐蚀时间的延长,合金表面局部腐蚀坑面积、腐蚀坑最大深度和腐蚀速率增大。在不含单质硫条件下合金表面腐蚀产物极少,主要为FeCO_(3),在含单质硫条件下,随着腐蚀时间的延长,表面腐蚀产物增多,主要为FeCO_(3)与FeS;单质硫在高温下发生歧化反应产生H^(+)和S^(2-),使825合金表面腐蚀产物膜破裂,从而加剧了局部腐蚀。 展开更多
关键词 高温高酸性环境 825合金 单质硫 腐蚀产物 局部腐蚀坑
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引线框架用高性能铜合金板带材及制备工艺
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作者 梁海成 高博伦 +2 位作者 王松伟 刘劲松 邓偲瀛 《铜业工程》 CAS 2024年第2期45-53,共9页
电子信息产业的飞速发展,对铜及铜合金产品性能提出了更高的要求,其中集成电路封装用引线框架材料代表了铜合金板带材发展的较高水平。本文对近年来引线框架用高性能铜合金板带材及制备工艺进行了综述,介绍了国内外高性能铜合金板带材... 电子信息产业的飞速发展,对铜及铜合金产品性能提出了更高的要求,其中集成电路封装用引线框架材料代表了铜合金板带材发展的较高水平。本文对近年来引线框架用高性能铜合金板带材及制备工艺进行了综述,介绍了国内外高性能铜合金板带材料的成分和制备加工技术及发展过程,并对其未来发展趋势进行了展望,提出未来高性能铜板带材性能将朝着抗拉强度为700 MPa、导电率为70%IACS的目标发展,其制备工艺将向着智能化、绿色化、高效化等方向发展。 展开更多
关键词 集成电路 铜合金 板带材 引线框架 生产工艺
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Corrosion and electrochemical behavior of Mg-Y alloys in 3.5% NaCl solution 被引量:6
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作者 张新 李永军 +4 位作者 张奎 王长顺 李宏伟 马鸣龙 张宝东 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第5期1226-1236,共11页
The corrosion mechanism of Mg-Y alloys in 3.5% NaCl solution was investigated by electrochemical testing and SEM observation. The electrochemical results indicated that the corrosion potential of Mg-Y alloys in 3.5% N... The corrosion mechanism of Mg-Y alloys in 3.5% NaCl solution was investigated by electrochemical testing and SEM observation. The electrochemical results indicated that the corrosion potential of Mg-Y alloys in 3.5% NaCl solution increased with the increase of Y addition. The corrosion rate increased with the increase of Y addition because of the increase of Mg24Y5 intermetallic amounts. The corrosion gradually deteriorated with the increase of immersion time. The corrosion morphologies of the alloys were general corrosion for Mg-0.25Y and pitting corrosion for Mg-8Y and Mg-15Y, respectively. The main solid corrosion products were Mg(OH)2 and Mg2(OH)3C1·4H2O. 展开更多
关键词 Mg-Y alloy polarization curves pitting corrosion corrosion products
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Effects of magnesium chloride-based multicomponent salts on atmospheric corrosion of aluminum alloy 2024 被引量:6
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作者 王彬彬 王振尧 +2 位作者 韩薇 汪川 柯伟 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第4期1199-1208,共10页
Atmospheric corrosion of aluminum alloy 2024 (AA2024) with salt lake water was simulated through a laboratory- accelerated test of cyclic wet-dry and electrochemical techniques. Effects of the soluble magnesium salt... Atmospheric corrosion of aluminum alloy 2024 (AA2024) with salt lake water was simulated through a laboratory- accelerated test of cyclic wet-dry and electrochemical techniques. Effects of the soluble magnesium salt contained in the salt water were investigated by scanning electron microscope (SEM), transmission electron microscope (TEM), energy dispersive spectrometer (EDS), electron probe micro analyzer (EPMA), X-ray diffraction (XRD), infrared transmission spectroscope (IR), and atmospheric corrosion monitor (ACM). The results showed that, with the deposition, atmospheric corrosion of AA2024 could occur when the relative humidity (RH) was lower than 30%. A main crystalline component of corrosion products, layered double hydroxides (LDH), [Mg1-xAlx(OH)2]^x+ Clx-·mH2O (LDH-C1), was determined, which meant that magnesium ion played an important role in the corrosion process. It not only facilitated the corrosion as a result of deliquescence, but also was involved in the corrosion process as a reactant. 展开更多
关键词 aluminum alloy 2024 atmospheric corrosion magnesium chloride relative humidity corrosion products
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Ti微合金化对高锰钢组织和性能的影响 被引量:2
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作者 潘胡江 杨新明 +2 位作者 李光强 杨治争 霍旭东 《特殊钢》 2024年第2期74-78,共5页
研究了Ti微合金化对Mn18钢组织和力学性能的影响,并分析了Mn18钢锤头失效的原因。结果表明,Ti微合金化在Mn18钢中具有细化晶粒、提高冲击韧性、伸长率、强度和硬度等作用,在Mn18钢加入0.10%和0.30%的w[Ti]时,随着Ti含量增加,高锰钢的硬... 研究了Ti微合金化对Mn18钢组织和力学性能的影响,并分析了Mn18钢锤头失效的原因。结果表明,Ti微合金化在Mn18钢中具有细化晶粒、提高冲击韧性、伸长率、强度和硬度等作用,在Mn18钢加入0.10%和0.30%的w[Ti]时,随着Ti含量增加,高锰钢的硬度增大、强度提高,冲击韧性和延伸性也均呈优化趋势,继续增加w[Ti]至0.51%时,除布氏硬度继续增大外,KU2数值及稳定性、强度稳定性、伸长率等指标均出现下降趋势,高锰钢属于高氮奥氏体钢,加入Ti后迅速析出大量TiN,作为异质核心,起到系列有益作用,加入量过大,则TiN类夹杂物的尺寸过大,且出现局部聚集,将对Mn18钢的性能稳定性造成不利影响,也易于导致Mn18锤头断裂失效。在Mn18钢中使用Ti微合金化,为保证其有益效果,其含量不应超过0.30%。 展开更多
关键词 TI微合金化 Mn18高锰钢 力学性能 夹杂物 失效
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稀土Y对低合金钢耐蚀性的影响研究
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作者 孟祥超 刘香军 +3 位作者 祝英杰 富晓阳 杨昌桥 杨吉春 《材料保护》 CAS CSCD 2024年第8期47-57,167,共12页
为了研究稀土Y对低合金钢耐腐蚀性能的影响,通过向DH36低合金钢中添加稀土Y,得到不同稀土含量的低合金钢,采用3.5%NaCl溶液作为腐蚀介质,模拟海洋环境对DH36船板钢耐腐蚀性能的影响。采用浸泡实验、激光共聚焦显微镜、扫描电镜(SEM)、X... 为了研究稀土Y对低合金钢耐腐蚀性能的影响,通过向DH36低合金钢中添加稀土Y,得到不同稀土含量的低合金钢,采用3.5%NaCl溶液作为腐蚀介质,模拟海洋环境对DH36船板钢耐腐蚀性能的影响。采用浸泡实验、激光共聚焦显微镜、扫描电镜(SEM)、X射线衍射分析仪(XRD)、电化学测试等方法来考察稀土Y对DH36船板钢耐腐蚀性能的影响,并采用电子背向散射衍射(EBSD)来探究未被稀土改性的夹杂物和稀土夹杂与钢基体之间的残余应力大小,进而判断夹杂物对低合金钢耐蚀性能的影响。结果表明:稀土可以细化晶粒、改性夹杂物,减少稀土夹杂物的周边应力,减少微裂纹与微孔洞的发生,进而降低低合金钢在模拟海洋环境中的腐蚀敏感性;Y的加入可以使腐蚀电位正移,减小腐蚀电流密度,减少腐蚀初期试验钢表面点蚀坑的出现,进而减小腐蚀发生的活性区;此外,稀土Y的添加使腐蚀产物中γ-FeOOH的含量显著减少,Fe_(3)O_(4)和α-FeOOH的含量增加,锈层的稳定性与致密性增强;Y的添加还使锈层厚度变大,更有效地阻碍Cl^(-)的进入。稀土Y的添加可以有效提高低合金钢的耐蚀性能,当稀土质量分数为0.0043%时,试验钢的耐蚀性最好。 展开更多
关键词 稀土Y 夹杂物 DH36低合金钢 耐蚀性 电化学 腐蚀产物
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钛铝金属间化合物激光点火燃烧行为及机理
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作者 吴明宇 弭光宝 +2 位作者 李培杰 隋楠 董富礼 《材料工程》 EI CAS CSCD 北大核心 2024年第5期1-16,共16页
采用激光氧浓度实验方法结合超高温红外测温仪和高速摄像机原位观察、扫描电子显微分析和X射线衍射分析等方法,对钛铝金属间化合物(TiAl合金)的点火燃烧行为进行研究,揭示燃烧过程熔体的形成与运动规律、氧化物类型和结构特征,进而探讨... 采用激光氧浓度实验方法结合超高温红外测温仪和高速摄像机原位观察、扫描电子显微分析和X射线衍射分析等方法,对钛铝金属间化合物(TiAl合金)的点火燃烧行为进行研究,揭示燃烧过程熔体的形成与运动规律、氧化物类型和结构特征,进而探讨燃烧机理。结果表明:TiAl合金发生起燃及持续燃烧的激光功率和氧浓度临界条件分别遵循抛物线规律和抛物线+直线规律,且显著高于近α型高温钛合金,即具有更好的阻燃性能;TiAl合金的起燃温度高于基体相熔点,起燃时基体部分熔化,导致Al元素由内氧化机制转变为外氧化机制;扩展燃烧阶段形成的氧化物由内侧到燃烧表面依次为Al_(2)O_(3),Al_(2)Ti_7O_(15),Al_(2)TiO_(5)和Al_(6)Ti_(2)O_(13)相,其中熔凝区内形成的连续网状Al_(2)O_(3)层能够阻碍熔体运动,燃烧区内形成的Ti-Al-O三元相通过降低内层Al_(2)O_(3)的分解压提升Al_(2)O_(3)保护层的稳定性,使TiAl合金具有良好的阻燃性能。 展开更多
关键词 TIAL合金 激光点火 氧化燃烧产物 燃烧机理 起燃温度
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