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Pitting corrosion behavior and corrosion protection performance of cold sprayed double layered noble barrier coating on magnesium-based alloy in chloride containing solutions

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Journal of magnesium and Alloys 2023年第9期11卷 3099-3119页

作者： m.Daroonparvar A.Helmer A.m.Ralls m.U.Farooq Khan A.K.Kasar R.K.Gupta m.misra S.Shao P.L.menezes N.Shamsaei National Center for Additive manufacturing Excellence Auburn UniversityAuburnAL 36849USA Department of mechanical Engineering Auburn UniversityAuburnAL 36849USA Department of materials Science and Engineering College of EngineeringNorth Carolina State University911 Partners WayRaleighNC 27695USA Department of mechanical Engineering University of Nevada RenoRenoNV 89501USA Department of Nuclear Engineering and Radiological Sciences University of MichiganAnn ArborMI 48105 USA Department of Chemical and materials Engineering University of Nevada RenoNV 89501USA

Nitrogen processed, cold sprayed commercially pure(CP)-Al coatings on mg-based alloys mostly lack acceptable hardness, wear resistance and most importantly are highly susceptible to localized corrosion in chloride containing solutions. In this research, commercially pure α-Ti top coating having good pitting potential(~1293 mV_(SCE)), high microhardness(HV_(0.025): 263.03) and low wear rate was applied on a CP-Al coated mg-based alloy using high pressure cold spray technology. Potentiodynamic polarization(PDP) curves indicated that the probability of transition from metastable pits to the stable pits for cold spayed(CS) Al coating is considerably higher compared to that with the CS Ti top coating(for Ti/Al/mg system). In addition, CS Ti top coating was in the passivation region in most pH ranges even after 48 h immersion in 3.5 wt% NaCl solution. The stored energy in the CS Ti top coating(as a passive metal) was presumed to be responsible for the easy passivation. Immersion tests indicated no obvious pits formation on the intact CS Ti top coating surface and revealed effective corrosion protection performance of the CS double layered noble barrier coatings on mg alloys in 3.5 wt% NaCl solution even after 264 h.

关键词： Ti coating mg alloys Localized corrosion Passivity Dislocation density Crystallite size

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浮选闪锌矿和黄铜矿时SO2的作用

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矿产综合利用 1987年第2期 91-96页

作者： m.misra 汪镜亮

前言泡沫浮选是富集复合硫化矿中所含矿物的主要方法。1976年,全世界从硫化物浮选精矿中生产了大约800万吨金属铜、600万吨金属锌和400万吨金属铅。在优先浮选Cu-Pb-Zn复合硫化矿时,使用了许多称之为捕收制、活化剂和抑制剂的各类药剂... 详细信息

前言泡沫浮选是富集复合硫化矿中所含矿物的主要方法。1976年,全世界从硫化物浮选精矿中生产了大约800万吨金属铜、600万吨金属锌和400万吨金属铅。在优先浮选Cu-Pb-Zn复合硫化矿时,使用了许多称之为捕收制、活化剂和抑制剂的各类药剂以获得所需要的选择性。最常用黄药作捕收剂,氰化物作抑制剂。在优先浮选硫化物矿物时,也

关键词：闪锌矿捕收剂戊基黄药硫化矿物浮选药剂铜矿物黄铜矿 SO2 黄药浓度

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温度和氧对油酸在萤石表面吸附的影响

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国外非金属矿 1988年第3期 27-33页

作者： J.S.HU m.misra J.D.mILLER 长沙矿冶研究院

本文论述在碱性溶液中用放射技术研究温度和氧对油酸在萤石表面吸附的影响。实验表明:在油酸化合物的表面明显凝聚有含水的油酸钙沉淀,而且,由于体系变化的作用,形成一定的吸附密度。吸附等温线有三个不同的区域:化学平衡区;吸附密度达... 详细信息

本文论述在碱性溶液中用放射技术研究温度和氧对油酸在萤石表面吸附的影响。实验表明:在油酸化合物的表面明显凝聚有含水的油酸钙沉淀,而且,由于体系变化的作用,形成一定的吸附密度。吸附等温线有三个不同的区域:化学平衡区;吸附密度达到最大值的油酸钙沉淀区;在较高油酸平衡浓度下吸附密度减小的第三区。根据上述实验结果,吸附似乎包括低平衡油酸浓度下的化学吸附层,其油酸浓度可不同于在矿粒表面的油酸钙沉淀的浓度,形成油酸钙沉淀的平衡浓度要大于5×10-6m,更重要的一点是,在较高温度和氧势条件下,适当改变吸附密度不能对在类似条件下观察到的、显著增大矿粒疏水性这一结果作出令人满意的解释。

关键词：油酸钙平衡浓度吸附等温线钙沉淀物化学吸附层超声波处理吸附反应溶度积吸附过程表面吸附

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Quantification of grain boundary effects on the geometrically necessary dislocation density evolution and strain hardening of polycrystalline mg-4Al using in situ tensile testing in scanning electron microscope and HR-EBSD

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Journal of magnesium and Alloys 2024年第5期12卷 1815-1829页

作者： Eunji Song mohsen Taheri Andani Amit misra Department of materials Science and Engineering University of MichiganAnn ArborMI 48109USA Department of mechanical Engineering University of MichiganAnn ArborMI 48109USA Department of mechanical Engineering Texas A&M UniversityCollege StationTX 77843USA

In situ tensile testing in a scanning electron microscope(SEm)in conjunction with high-resolution electron backscatter diffraction(HR-EBSD)under load was used to characterize the evolution of geometrically necessary dislocation(GND)densities at individual grain boundaries as a function of applied strain in a polycrystalline mg-4Al *** increase in GND density was investigated at plastic strains of 0%,0.6%,2.2%,3.3% from the area including 76 grains and correlated with(i)geometric compatibility between slip systems across grain boundaries,and(ii)plastic *** develop expressions for the grain boundary GND density evolution as a function of plastic strain and plastic incompatibility,from which uniaxial tensile stress-strain response of polycrystalline mg-4Al are computed and compared with experimental *** findings in this study contribute to understanding the mechanisms governing the strain hardening response of single-phase polycrystalline alloys and more reliable prediction of mechanical behaviors in diverse microstructures.

关键词： mg-Al alloys Grain boundaries Geometrically necessary dislocations Strain gradient plasticity HR-EBSD

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微生物在选矿中作为选矿药剂的应用

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国外金属矿选矿 1996年第6期33卷 46-49页

作者：李艳军 R.W.史密斯 m.misra A.H.SCHNEIDER A.RAICHUR UNIVERSITYOFNEVADA RENO89557 UNIVERSIDADEFEDERALDORIOGRANDEDOSUL PORTOALEGRERSBRAZIL

微生物作为化学试剂（絮凝剂、浮选调整剂和捕收剂）完全属于全新的概念。在矿物工程领域里，微生物很可能用来代替常见的浮选药剂和絮凝剂。此外，在有关矿物的浮选及絮凝等研究中，微生物已经被用来调整矿物表面的性质。

关键词：选矿微生物选矿药剂

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神经性厌食症的女性:应用平板容积CT的有限元及小梁结构分析

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国际医学放射学杂志 2010年第6期 575-576页

作者： C.J.Walsh C.m.Phan m.misra m.A.Bredella K.K.miller P.K.Fazeli 刘彬 Department of mechanical Engineering Massachusetts Institute of Technology77 Massachusetts AveRoom 3-470CambridgeMA 02139

目的使用基于平板容积CT的有限元模型和双能X线吸收骨密度仪提供的骨矿物质密度,将神经性厌食症女性与同龄、正常体质量对照组的骨衰竭载荷、硬度及小梁结

关键词：神经性厌食症正常体病人小梁质量神经官能症骨小梁参数容积梁结构 CT 女性

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A combined tectono-climatic control on Holocene sedimentation in Ladakh Himalaya,India: Clues from Anisotropy of magnetic Susceptibility(AmS) of lake sediments

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Journal of Palaeogeography 2024年第4期13卷 738-753页

作者： B.V.Lakshmi K.Deenadayalan md.mujahed Baba Saumitra misra Indian Institute of Geomagnetism Discipline of Geological Sciences SAEESUniversity of Kwa Zulu-Natal

Anisotropy of magnetic Susceptibility(AmS) data from a ～27.8 m thick soft sedimentary mud sequence(～10.5-3.25 k yrs) from the Spituk Palaeolake Sequence(SPSS) of Holocene age, located in the northern bank of the Indus River in the Leh-Ladakh Himalaya, show effects of tectonic versus climate dynamics responsible for the Himalayan sedimentation. The sedimentary sequence, consisting of alternating of aeolian sand and glacio-fluvial mud flow deposits, has been subdivided into an older Last Glacier Phase I(LGP 1) and a younger Last Glacier Phase II(LGP 2), where the termination of each phase is marked by the occurrence of gravel beds of thickness ≤1 m, which were deposited due to glacial melting. The present AmS data along with previously published information on sedimentology confirm that the mudflow deposits of the LGP 1 and LGP 2phases were deposited in a lacustrine environment under glacio-fluvial conditions. However, a weak fluvial flow towards NW and NE could have existed for the LGP 1 and LGP 2, respectively. The glacial beds terminating LGP 1 and LGP 2 appear to have formed by climatic warming and tectonic activity, respectively. Hence, the Holocene Himalayan sedimentation was influenced by both climatic and tectonic activities. However, the thickness of the gravel bed(～0.8 m) terminating LGP 2 occupies only ～ 2.8 vol % of the total studied thickness～28 m, of the SPSS in the present study, which indicated a lesser control of tectonism in the growth of the Himalaya in and around the study area.

关键词： Holocene palaeolake sequence AmS studies Gravel beds Deglaciation Tectonic instability

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Effect of La on the Corrosion Behavior and mechanism of 3Ni Weathering Steel in a Simulated marine Atmospheric Environment

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Acta metallurgica Sinica(English Letters) 2024年第2期37卷 308-324页

作者： Gang Niu Rui Yuan R.D.K.misra Na Gong Zhi-Hui Zhang Hao-Xiu Chen Hui-Bin Wu Cheng-Jia Shang Xin-Ping mao Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing100083China Laboratory for Excellence in Advanced Steel Research Department of MetallurgicalMaterials and Biomedical EngineeringUniversity of Texas at El PasoEl PasoTX79968USA Institute of materials Research and Engineering Agency for ScienceTechnologyand ResearchSingapore138634Singapore Department of materials Science and Engineering University of TorontoTorontoONM5S 3E4Canada

The corrosion behavior and mechanism of 3Ni weathering steel in a simulated oceanic atmospheric environment are investigated in order to comprehend the impacts of La,as determined through electrochemical analysis and rust layer *** results of this study demonstrate that the addition of La enhances the corrosion resistance of 3Ni weathering steel in the marine atmospheric environment,thereby reducing the corrosion rate and improving the protection of the rust *** influence of La on corrosion resistance can be attributed to two primary ***,La functions as a grain refiner,minimizing the potential difference of the micro-regions on the substrate surface,thereby significantly reducing the corrosion of bare steel in the marine ***,La inhibits the process of Fe_(3)O_(4) oxidation back toγ-FeOOH during corrosion at the local site,thus decreasing the formation ofγ-FeOOH and enhancing the charge transfer *** research work may serve as a reference for expanding the application of rare earth elements in the field of weathering steel.

关键词： Weathering steel Rare earth Rust layer Corrosion behavior Corrosion resistance

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高分辨率平板容积CT对患有神经性厌食症少女的桡骨远端骨小梁结构的分析

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国际医学放射学杂志 2009年第1期32卷 77-77页

作者： m.A.Bredella m.misra K.K.miller I.madisch A.Sarwar A.Cheung 王高峰 Department of Radiology Massachusetts General Hospital 55 Fruit St Yawkey 6E Boston MA 02114 USA

目的对患有神经性厌食症（AN）少女分别行高分辨率平板容积CT检查骨小梁微结构和双能X线吸收测定（DXA）检测骨密度（BmD），所获结果与正常体质量对照组的结果进行比较。材料与方法本研究经机构审查委员会批准并遵从HIPAA的规定。... 详细信息

目的对患有神经性厌食症（AN）少女分别行高分辨率平板容积CT检查骨小梁微结构和双能X线吸收测定（DXA）检测骨密度（BmD），所获结果与正常体质量对照组的结果进行比较。材料与方法本研究经机构审查委员会批准并遵从HIPAA的规定。检查对象签署知情同意书。分别对10例患轻度神经性厌食症（平均年龄15．9岁；范围13～18岁）和10位年龄及性别匹配的正常体质量（平均年龄：15．9岁：范围12～18岁）共20位少女行平板容积CT桡骨远端扫描，

关键词：神经性厌食症骨小梁结构容积CT 桡骨远端高分辨率少女平板 X线吸收测定

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Surface plasmon oscillations in a semi-bounded semiconductor plasma

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Plasma Science and Technology 2018年第2期20卷 76-81页

作者： m SHAHmANSOURI A P misra Department of Physics Faculty of ScienceArak University Department of mathematics Siksha BhavanaVisva-Bharati University

We study the dispersion properties of surface plasmon（SP） oscillations in a semi-bounded semiconductor plasma with the effects of the Coulomb exchange（CE） force associated with the spin polarization of electrons and holes as well as the effects of the Fermi degenerate pressure and the quantum Bohm *** from a quantum hydrodynamic model coupled to the Poisson equation,we derive the general dispersion relation for surface plasma *** results in this context are *** dispersion properties of the surface waves are analyzed in some particular cases of interest and the relative influence of the quantum forces on these waves are also studied for a nano-sized Ga As semiconductor *** is found that the CE effects significantly modify the behaviors of the SP *** present results are applicable to understand the propagation characteristics of surface waves in solid density plasmas.

关键词： surface plasmon oscillations semiconductor plasma semi-bounded plasma

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