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Thermo-driven oleogel-based self-healing slippery surface behaving superior corrosion inhibition to mg-li alloy

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Journal of Magnesium and alloys 2023年第12期11卷 4710-4723页

作者： Yibo Ouyang Huijun Kang Enyu Guo Ri Qiu Keqiang Su Zongning Chen Tongmin Wang Key Laboratory of Solidification Control and Digital Preparation Technology(liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024PR China Ningbo Institute of Dalian University of Technology Ningbo 315000PR China College of Safety and Environmental Engineering Shandong University of Science and TechnologyQingdao 266590PR China State Key Laboratory for Marine Corrosion and Protection Luoyang Ship Material Research InstituteQingdao 266101PR China Institute of Yellow River Delta Earth Surface Processes and Ecological Integrity Shandong University of Science and TechnologyPR China

Bioinspired by Nepenthes, lubricant infused surfaces(liS) have attracted widespread attention in the field of anticorrosion. However,the lubricant coating has some disadvantages such as complex construction processing and easy loss of oil phase in air or dynamic water phase. In this study, oleogel is infused into a lotus leaf inspired super-hydrophobic matrix to form an oleogel infused surface(OIS) for enhancing corrosion resistance of active mg-li alloy. For reserving oleogel, firstly, a facile one-step electrodeposition method is used to construct super-hydrophobic surface(SHS) composed by samarium/myristic acid complex micro-nano flower structure onto mg-li alloy.The coating exhibits excellent superhydrophobic property at a static contact angle of 160° by applying 30 V electrolysis for 30 min. The protection efficiency of single SHS highly relates with the metal itself. For short period immersion in water phase, SHS can afford protection to mg-li alloy. However, the long-term immersion will see the rapid failure of SHS, and the high activity of mg-li alloy is one main reason.We assume that SHS cannot be a good choice for protecting mg-li alloy. Then, a Nepenthes inspired liquid coating is formed by infusing oleogel into the micro-nano structure by a spin-coating method. The liquid coating performs prominent corrosion resistance with Rctreaching as high as 1.51 × 10^(10)Ω cm^(2). After the mechanical damage from the external environment, the liquid coating can realize self-repair through thermal assistance, and the liquid coating can still restore Rctup to 1.24 × 10^(10)Ω cm^(2) after healing. The corrosion resistance of the liquid coating remains strong by showing Rctas high as 1.14 × 10^(9)Ω cm^(2), even after immersion in representative corrosive 3.5 wt% Na Cl solution for 30 d.

关键词： mg-li alloy Oleogel Superhydrophobic Self-healing Corrosion

Quasi-in-situ study on{10-12}twinning-detwinning behavior of rolled mg-li alloy in two-step compression(RD)-compression(ND)process

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Journal of Magnesium and alloys 2022年第10期10卷 2775-2787页

作者： Biaobiao Yang Chenying Shi Siyu Zhang Jingjing Hu Jianwei Teng Yujie Cui Yunping li Akihiko Chiba State Key Lab for Powder Metallurgy Central South UniversityChangsha 410083China Institute for Materials Research Tohoku UniversitySendai 980-8577Japan

Twinning-detwinning(TDT)behavior in a strongly basal-textured mg-li alloy during two-step compression(RD)-compression(ND)process was investigated using quasi-in-situ EBSD.TDT behavior and TDT variants selection were statistically discussed with the loading path for the first time.Non-Schmid twinning behavior was observed in the first step compression,owing to the local stress fluctuations by neighboring twins;in contrast,Schmid’s law well predicted the detwinning variants selection.This asymmetrical TDT behavior was first investigated to date related with the strong basal texture and loading path.Besides,with the progress of compression,Schmid factors for twinning demonstrated a decreasing tendency;however,those for detwinning during the second step displayed an abnormally increasing trend,fundamentally stemming from prior twinning behavior.

关键词： Twinning-detwinning mg-li alloy Quasi-in-situ Biaxial loading

Ultra-high strength mg-li alloy with B2 particles and spinodal decomposition zones

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Fundamental Research 2023年第3期3卷 430-433页

作者： Shun Zhang Ruizhi Wu Feng Zhong Xiaochun Ma Xiang Wang Qiang Wu Key Laboratory of Superlight Materials&Surface Technology(Ministry of Education) Harbin Engineering UniversityHarbin 150001China College of Science Heihe UniversityHeihe 164300China

The bcc-structured mg-li alloy is currently the engineering metallic material with the lowest density,but it has not been widely used due to its low strength.In this paper,alloying Zn effectively improves the strength of the bcc-structured mg-li alloy.Due to the semi-coherent B2 structured nanoparticles,the compressive yield strength of the as-cast mg-13li-9Zn alloy reaches higher than 300 MPa.Due to the solid solution strengthening of Zn and the spinodal zone,the compressive yield strength of the as-quenched mg-13li-15Zn(LZ1315)alloy immediately increases to 400 MPa.In addition,the as-quenched LZ1315 alloy exhibits natural aging strengthening behavior.Due to the precipitation of B2 nanoparticles,the yield strength of the peak aged alloy is up to 495 MPa.

关键词： mg-li alloy alloying Zn Semi-coherent B2 structure Solid solution strengthening Natural aging strengthening

Effect of carbonate additive on the microstructure and corrosion resistance of plasma electrolytic oxidation coating on mg-9li-3Al alloy

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International Journal of Minerals,Metallurgy and Materials 2022年第7期29卷 1453-1463页

作者： Siyuan Jin Xiaochun Ma Ruizhi Wu Tingqu li Jiaxiu Wang Boris L Krit Legan Hou Jinghuai Zhang Guixiang Wang Key Laboratory of Superlight Materials&Surface Technology Ministry of EducationHarbin Engineering UniversityHarbin 150001China College of Materials Science and Engineering Jilin Institute of Chemical TechnologyJilin 132022China College of Science Heihe UniversityHeihe 164300China Moscow Aviation Institute National Research UniversityMoscow 125993Russia

Carbonate was added to the silicate system electrolyte to improve the corrosion resistance of the plasma electrolytic oxidation coating on mg-9li-3Al(wt%,LA93)alloy.The influences of carbonate on the morphology,structure,and phase composition of the coating were investigated by scanning electron microscopy,energy dispersive spectrometry,X-ray diffraction,and X-ray photoelectron spectroscopy.The corrosion resistance of the coating was evaluated by electrochemical experiment,hydrogen evolution,and immersion test.The results showed that the addition of carbonate resulted in a denser coating with increased hardness,and the corrosion-resistant li_(2)CO_(3) phase was formed.Electrochemical experiments showed that compared with the coating without carbonate,the corrosion potential of the carbonate coating positively shifted(24 mV),and the corrosion current density was reduced by approximately an order of magnitude.The coating with carbonate addition possessed a high corrosion resistance and long-term protection capability.

关键词： mg-li alloy plasma electrolytic oxidation corrosion resistance carbonate

Sodium dodecyl sulfate (SDS) as an effective corrosion inhibitor for mg-8li-3Al alloy in aqueous NaCl: A combined experimental and theoretical investigation

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Journal of Magnesium and alloys 2023年第1期11卷 287-300页

作者： Honggun Song Zhidong Xu Lahouari Benabou Zheng Yin Hongyu Guan Hong Yan Luo Chao Zhi Hu Xudong Wang Department of Mechanical and Electrical Engineering Nanchang UniversityNanchang330031China UniversitéParis-Saclay UVSQLISV78124Vélizy-VillacoublayFrance Institute for Advanced Study Nanchang UniversityNanchang330031China

The corrosion inhibition behavior of mg-8li-3Al alloy in NaCl solution with sodium dodecyl sulfate(SDS)was investigated by hydrogen analysis,scanning electron microscopy(SEM),electrochemical test,scanning Kelvin probe force microscopy(SKPFM)and computational methods.Results showed that the corrosion resistance of mg-8li-3Al alloy in NaCl solution was effectively improved with SDS.The SEM and SKPFM results confirmed a dense,200 nm-thick SDS-adsorbed layer had formed on the alloy surface.The separation energy ΔE_(gap) and adsorption energy E_(ads) of SDS on the mg surface were calculated by density functional theory and molecular dynamics simulations,respectively.And the corrosion inhibition mechanism was hypothesized and described.

关键词： mg-li alloy Corrosion Sodium dodecyl sulfate Scanning kelvin probe force microscopy Density functional theory Molecular dynamics

Investigation of Portevin–Le Chatelier effect in rolled α-phase mg-li alloy during tensile and compressive deformation

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Journal of Materials Science & Technology 2020年第17期52卷 152-161页

作者： Xiaoqiang li Chunlong Cheng Qichi Le Lei Bao Peipeng Jin Ping Wang liang Ren Hang Wang Xiong Zhou Chenglu Hu Key Laboratory of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang110819China Qinghai Provincial Key Laboratory of New light alloys Qinghai Provincial Engineering Research Center of High Performance Light Metal Alloys and FormingQinghai UniversityXining810016China

Avoiding the Portevin-Le Chatelier(PLC)effect is very important concern for wrought mg-li alloys.In this study,the special PLC effect was found in rolled mg-5li-3Al-2Zn(LAZ532)alloy during tensile and compressive deformation.By observing microstructure evolution of the alloy during tensile and compressive deformation,it was found that prismaticand pyramidalslips were activated during tensile deformation,resulting in plenty of dislocation accumulation.In the deformation process after compressive yielding,the deformations in coarse grains and fine grains were dominated by{1012}extension twinning and grain boundary slip,respectively.Based on experimental result analysis,the sudden appearance of PLC effect in the later stage of axial tensile deformation(along rolled direction)was caused by interaction between solute atoms and dislocations.In the process of axial compressive deformation(along rolled direction),PLC effect presented the complex and changeable phenomenon of appeared-disappeared-appeared,which was mainly caused by the continuous nucleation of twin in the material,the activation of grain boundary slip and the shear deformation of twin,respectively.

关键词： mg-li alloy Portevin-Le Chatelier effect Dynamic strain aging Twins

Design of an age hardening mg-li alloy and its aging behavior

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Journal of University of Science and Technology Beijing 2005年第2期12卷 182-186页

作者： HaoZhong Peiyingliu TietaoZhou Huanxili SchoolofMaterialsScienceandEngineering BeijingUniversityofAeronauticsandAstronauticsBeijing100083China

An effort was made to design an age hardening mg-li alloy based on the phase diagrams calculated by means of 'THERMO-CALC'—a thermodynamic software. Experiments were carried out to verify the calculated results by melting the alloy and examining its structure and aging behavior. The results show that the alloy possesses a structure constituent as expected, besides, the alloy has apparent aging behavior and over aging happens even at lower temperature. Metastable (mg, li, Al, Zn) phase has been identified when the hardness reaches the aging peak. With the increase of the aging time, (mg, li, Al, Zn) phase transforms to stable α phase and over aging happens.

关键词： mg-li alloy composition design thermodynamic calculations aging

Cerium Chemical Conversion Coating on a Novel mg-li alloy

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Journal of Wuhan University of Technology(Materials Science) 2010年第1期25卷 112-117页

作者：高丽丽张春红 Key Laboratory of Superlight Materials and Surface Technology College of Materials Science and Chemical EngineeringHarbin Engineering University

A novel mg-li alloy was treated in a cerium nitrate solution and cerium chemical conversion coating was obtained on the alloy. Then the forming process, structure and corrosion resistance of the coating were investigated. The influential factors of cerium conversion coating were discussed through orthogonal experiments, and the optimum processing parameters were confirmed. XPS spectra displayed that the conversion coating consisted of cerium compounds, and the major component of the protective layer was a mixture of Ce （IV） oxide and Ce （IV） hydroxide. In addition, XRD pattern illustrated that there was crystalline CeO2 in the conversion coating. Analysis by SEM showed that the cerium conversion coating was uniform with a fiber-like morphology. The thickness of the conversion coating was 12 μm. The results of electrochemical potentiodynamic polarization and hydrogen evolution measurement indicated that the cerium conversion coating provided effective protection to the novel mg-li alloy.

关键词： mg-li alloy chemical conversion coating cerium nitrate coating structure corrosion resistance

Deformation Behavior of mg-8 wt%li alloy under High-speed Impact

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Chinese Journal of Aeronautics 2006年第B12期19卷 235-238页

作者： SHA Gui-ying liU Chun-zhong YU Tao SHI Ji-hong Department of Materials Engineering Shenyang Institute of Aeronautical Engineering Shenyang 110034 China

Deformation behavior of the mg-8 wt%li alloy at high strain rate was studied by means of the Split Hopkinson Pressure Bar （with strain rate of 10^3 s^-1）. It is found that shear localization proves to be the main damage mode for the alloy during dynamic loading. Strain and strain rate arc the two necessary parameters affecting the occurrence of deformation and shear bands. Deformation bands begin to form when the strain and strain rate reach 0.20 and 1 900 s^-1 respectively and will develop gradually with the strain rate increasing. Besides, deformation bands will transform into shear bands when the strain and strain rate reach above 0.25 and 3 500 s^-1 separately.

关键词： strain rote strain shear localization mg-li alloy