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Chinese Journal of Polymer Science 2023年第1期41卷 117-128页

作者： Jian Liu Zhuang Nie Rui Qin An-Ping Ou Tao Zhang Xu Wang Xiang-Yang Liu College of Polymer Science and Engineering State Key Laboratory of Polymer Material and EngineeringSichuan UniversityChengdu610065China Zhejiang key laboratory of marine materials and Protective technologies Key Laboratory of Marine Materials and Related TechnologiesCASNingbo315000China

The key to improve the foam’s performance is to optimize the cellular structure and its bulk-material composition.Here,the hyperbranched polymer modified fluorinated multi-walled carbon nanotube(HPMCNT-F)based on the nucleophilic reactions of MCNT-F was successfully prepared and used to composite with PI foams.The pristine MCNT shows a poor dispersity and weak interfacial interaction with PI matrix.While HPMCNT-F exhibits an excellent dispersity and effectively forms covalent/non-covalent interaction with PI matrix due to the surface-structure engineering,resulting in the enhancement of the PI bulk.Furthermore,HPMCNT-F works as a heterogeneous nucleation agent in PI foam to optimize the cellular structure.The enhancement of PI bulk and the optimizing of cellular structure result in the increase of compressive special strength of composite foam by 58.9%with a low loading of 1.6 wt%HPMCNT-F.Moreover,the hyperbranched polymers effectively prevent the thermal conduction among HPMCNT-F,and the isolated MCNTs effectively block thermal radiation through absorption and reflection the infrared waves.Thus,the thermal conductivity was reduced by 8.0%simultaneously.

关键词： Foams Nanocomposites Mechanical properties Thermal properties

Corrosion Resistance of Graphene-Reinforced Waterborne Epoxy Coatings

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Journal of materials Science & Technology 2016年第5期32卷 425-431页

作者： Shuan Liu Lin Gu Haichao Zhao Jianmin Chen Haibin Yu Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective Technologies Ningbo Institute of Materials Technologies and Engineering Chinese Academy of Sciences

Graphene （G） was dispersed uniformly in water and used as an inhibitor in waterborne epoxy coatings. The effect of dispersed G on anticorrosion performance of epoxy coatings was evaluated. The composite coatings displayed outstanding barrier properties against H20 molecule compared to the neat epoxy coating. Open circuit potential （OCP）, Tafel and electrochemical impedance spectroscopy （EIS） analysis confirmed that the corrosion rate exhibited by composite coatings with 0.5 wt% G was an order of magnitude lower than that of neat epoxy coating. Salt spray test results revealed superior corrosion resistance offered by the composite coating.

关键词： Waterborne epoxy coating Graphene Corrosion resistance Electrochemical impedance spectroscopy（EIS）

Self-assembling anchored film basing on two tetrazole derivatives for application to protect copper in sulfuric acid environment

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Journal of materials Science & Technology 2020年第17期52卷 63-71页

作者： Yujie Qiang Hao Li Xijian Lan Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China

Two tetrazole compounds(BTA,BTTA)self-assembled on copper substrate and their inhibition effect toward copper corrosion in 0.5 M H2SO4 was evaluated through atomic force microscopy(AFM),scanning electron microscopy(SEM),weight loss measurement along with electrochemical techniques including electrochemical impedance spectroscopy(EIS)and potentiodynamic polarization.Results indicate that BTTA can provide superior inhibition performance to BTA,and the highest inhibition efficiency values of 96.3%(BTA)and 99.8%(BTTA)were achieved respectively at 2 mM.Both tetrazole inhibitor films follow Langmuir model concerning both physical and chemical adsorption,which can be verified by Xray photoelectronic spectroscopy(XPS)analysis.Besides,the negative value of adsorption free energy infers a spontaneous adsorption process of these tetrazole compounds on Cu surface.Molecular dynamics(MD)simulation reveals stronger multiple anchor adsorption of BTTA molecules than BTA because of the existence of S atom.

关键词： Copper Corrosion inhibitor Adsorption Anticorrosion MD simulation

Cu合金在电弧熔丝增材制造过程中的组织与力学性能演化

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Journal of Central South University 2023年第2期30卷 400-411页

作者：张青科杨杰孙文声宋振纶 Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Ningbo Boway Alloy materials Co. Ltd.Ningbo 315100China

本文研究了Cu-8Al合金在电弧熔丝增材制造过程中的微观组织、物相、显微硬度和拉伸性能的演化行为。结果表明,刚沉积的CuAl合金晶粒为尺寸较大的枝晶,在后道次的热影响作用下转变成较细小的柱状晶,而后柱状晶长大,直到晶粒尺寸在距样品... 详细信息

本文研究了Cu-8Al合金在电弧熔丝增材制造过程中的微观组织、物相、显微硬度和拉伸性能的演化行为。结果表明,刚沉积的CuAl合金晶粒为尺寸较大的枝晶,在后道次的热影响作用下转变成较细小的柱状晶,而后柱状晶长大,直到晶粒尺寸在距样品端部几毫米的位置趋于稳定。刚沉积的CuAl合金发生Al的枝晶偏析,但在后道次热影响的作用下偏析可消除,使合金组织和成分均匀化。板状样品端部即最后沉积未受后续热影响的位置显微硬度高达HV 160,但随着Al偏析的消除以及枝晶转变成柱状晶,硬度降低到HV 80。原位拉伸结果显示CuAl合金板的抗拉强度高达400 MPa,伸长率可达50%,其屈服强度还有一定的提升空间。拉伸过程中原位观察到了位错滑移和晶粒转动,断裂机制总体为韧窝断裂,端部屈服强度更高、塑性略低、晶粒转动更普遍。总体上电弧熔丝增材制造的CuAl合金板除端部之外组织均匀,具备良好的力学性能。如需其组织性能均匀,或要求高耐蚀性,有必要在沉积后对端部进行局部热处理;如需更好的耐磨性能则不需处理。可进一步添加少量析出强化元素提高CuAl合金的强度与耐磨性能。

关键词：电弧熔丝增材制造 CuAl合金枝晶偏析晶粒转变显微硬度

Insight into the high-temperature tribological mechanism of VAlTiCrW high entropy alloy film:AlV_(3)O_(9)from tribochemistry

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Friction 2023年第7期11卷 1165-1176页

作者： Xuesong LIU Jun FAN Jibin PU Zhaoxia LU College of Chemistry and Chemical Engineering Guangxi UniversityNanning 530004China Key Laboratory of Marine Materials and Related Technologies Key Laboratory of Marine Materials and Protective Technologies of Zhejiang ProvinceNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China

High-entropy alloys have made significant progress in high mechanical properties,wear resistance,and corrosion resistance properties.Excellent tribological properties,especially high-temperature lubrication,have become another sought performance.In this work,VAlTiCrW high-entropy alloy film with body-centered cubic(BCC)structure was prepared on superalloy substrate by magnetron sputtering.It is found that the VAlTiCrW film shows very low friction coefficient of 0.15 and a low wear rate of 10^(-5) orders of magnitude at 800℃.After 800℃oxidation,the film can still obtain a friction coefficient of no more than 0.2 at 700℃.XRD and TEM revealed the formation of ternary oxide AlV_(3)O_(9)with preferred orientation of(002)crystal plane with large spacing of 0.71 nm on the wear surface of the film,a high-temperature lubricating phase that has not been reported,realizes the low friction coefficient.This AlV_(3)O_(9)can be formed by tribochemical reaction under the thermal-mechanical action at 700℃,but pre-oxidation at 800℃is the prerequisite in order to form the precursors of V-rich and Al-rich oxide layer.

关键词： high entropy alloy high temperature friction AlV_(3)O_(9) oxide

Efficient prediction of corrosion behavior in ternary Ni-based alloy systems:Theoretical calculations and experimental verification

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Journal of materials Science & Technology 2023年第36期167卷 94-106页

作者： Xuelian Xiao Keke Chang Kai Xu Ming Lou Liping Wang Qunji Xue Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Center of materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Pourbaix diagrams are calculated to describe electrochemical processes for alloys in aqueous solution.With the multi-component differentiation of alloy systems,the construction of Pourbaix diagrams is fac-ing challenges,especially for non-single-phase alloy systems.In this study,the simultaneous construction of phase diagrams and Pourbaix diagrams were implemented for predicting the evolution of the phases in the immune and passive regions.The CALPHAD(CALculation of PHAse Diagram)approach was used to quickly access the Gibbs free energies of various phases and the chemical potential of the elements in the phases from the thermodynamic database of the Ni-Si-Al-Y system.The corrosion behavior of two typical Ni-Al-Si and Ni-Al-Y systems was investigated.Si and Y were added to Ni-based alloys to produce the solid solutions L12-Ni_(3)(Al,Si)and L12-Ni_(3)Al+Ni_(5)Y,respectively.Calculations showed that NiO and Al_(2)O_(3)make up the passive area of the Ni_(3)Al 1 alloy.The introduction of SiO_(2)and Y(OH)3 in the passive region separately helped to minimize the alloys’susceptibility to corrosion.However,Si reduced the thermody-namical possibility of NiO for mation in the passive film,and the addition of Y caused extreme galvanic corrosion.Experiments on Ni-based alloys validated the results through electrochemical corrosion.It was also discovered that the presence of Ni_(5)Y produced galvanic corrosion and that Si reduced the oxide in the passive film,causing pitting corrosion.The corrosion prediction of the quaternary alloys indicates that the solid solution of Si in Ni_(5)Y reduces the galvanic corrosion effect and the dissolution of passive film.The current work demonstrates that phase diagrams and Pourbaix diagrams may be efficiently and accurately predicted using a well-constructed thermodynamic database,which has major implications for future studies on the corrosion behavior of multi-component alloys.

关键词： Pourbaix diagrams CALPHAD Ni-based alloys Passive film

Double-Layer Hydrogels with Tunable Mechanofluorochromic Response for Smart Display

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Chinese Journal of Polymer Science 2023年第4期41卷 547-555,I0007页

作者： Hui-Hui Shi Shuang-Shuang Wu Rui-Jia Wang Yi Zhang Shu-Hui An Wei Lu Tao Chen Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo315201China School of Chemical Sciences University of Chinese Academy of SciencesBeijing100049China

Mechanofluorochromic materials that render sensitive fluorescence color/pattern change upon mechanical stimuli have drawn extensive attention.However,traditional mechanofluorochromism relies on the chemical transformations of mechanophores,but their types are quite few.It remains challenging to develop mechanofluorochromic materials with customized fluorescence color changing response.Herein,a generally applicable strategy is proposed to present a class of double-layer mechanofluorochromic hydrogels based on the facile integration of two different-colored fluorescent hydrogels.Due to the UV transmittance change of top layer under Poisson’s effect,the emission intensity ratio of the upper and lower hydrogels exhibits a strain-dependent change,resulting in a force-triggered overlapping color variation.Both the UV transmittance of top layer and the fluorescence emission of bottom layer can be readily modulated to enrich the variety of mechanofluorochromism.Besides,the bottom layer is available to be printed by ion inks to fabricate patterned double-layer fluorescent hydrogel,holding great potential to design flexible mechanofluorochromic platforms for smart display and information encryption.

关键词： Mechanofluorochromism Fluorescent hydrogel Double layer Smart display

Design of the rare-earth-containing materials based on the micro-alloying phase equilibria, phase diagrams and phase transformations

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Journal of materials Science & Technology 2023年第20期151卷 119-149页

作者： Kai Xu Chengcheng Zhan Ming Lou Xuelian Xiao Ruonan Zhou Fangming Wang Xiaofei Hu Yuan Yuan Keke Chang Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Center of materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Rare-earth(RE)elements,known as“industrial vitamins”,have permeated modern lives,especially in high-tech applications.Although the RE elements possess close chemical similarities and have been treated as“one element”in the periodic table,their characteristics differ from each other.The RE microalloying effect is the crux to ameliorate the physicomechanical and thermochemical properties of materials,thereby the study of RE-related phase diagrams becomes indispensable to the design and optimization of RE-containing materials.However,in reality,the knowledge base in this area is considerably scarce compared with that of other commonly-used elements.In this work,the phase equilibria,phase diagrams,phase transformations,and some recent examples of RE-containing materials design are summarized,with which one can predict the RE solubilities,the RE precipitates,as well as the corresponding service behaviors.The attainment of enhanced materials’properties suggests that the thermodynamic rules extracted from the phase diagrams could serve as fundamental criteria for the successful development of novel RE-containing materials.

关键词： Rare-earth elements Phase diagrams CALPHAD Phase transformations materials design

Achieving anti-corrosion and anti-biofouling dual-function self-healing coating by natural carrier attapulgite loading with 2-Undecylimidazoline

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Journal of materials Science & Technology 2023年第17期148卷 222-234页

作者： Yinghao Wu Jinming Wei Xiaolu Shi Wenjie Zhao Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Ningbo New Material Testing and Evaluation Center Co. LtdNingbo 315048China

In the marine environment,the protective coatings face serious corrosion and biofouling problem,lim-itations,and challenges that made self-healing coatings unable to perform both anti-corrosion and anti-biofouling dual-function at the same time.Here we constructed the corrosion resistance and anti-biofouling self-healing coating by integrating nano-containers into the coating matrix,the 2-Undecylimidazoline(ULM)acted as a corrosion inhibitor and anti-biofouling dual-functional agent which was loaded on the natural container attapulgite(ATP).To obtain high healing efficiency,a fluidity-driven self-healing silicone oil coating was thickened by fibrous ATP to enhance its stability,which played a key role in the self-healing and long-term corrosion resistance.The self-healing time of ULM@ATP rein-forced oil coating was 4 s at least in the air and up to 30 s in the 1 M HCl solution.Meanwhile,the ULM@ATP can significantly enhance the corrosion resistance of the self-healing coating,with the best effect achieved when the content of ULM@ATP was 5 wt.%.The impedance modulus of ULM@ATP-2 still reached 1.62×10^(8)Ωcm^(2) after 480 immersion in 3.5 wt.%NaCl solution,which is 3 orders of magnitude high than pure Oil coating(2.17×10^(5)Ωcm^(2)).The restructure of the ATP network and the release of ULM could largely inhibit the corrosion of metal.The continuous open circuit potential of the compos-ite coating performed the potentially infinite self-healing capacity.The self-healing performances of the composite coating in strong acid and base solutions exhibited high environmental suitability.This anti-corrosion and anti-biofouling(the surface coverage of adhered chlorella decreased 96.88%)dual-function strategy of self-healing coatings could be also realized by many other porous nano-materials or function modifications.The self-healing performances of the composite coating in strong acid and base solutions exhibited high environmental suitability.This anti-corrosion and anti-biofouling dual-function strategy of self-healing co

关键词： Self-healing Active corrosion resistance Anti-biofouling Attapulgite

Prussian Blue/Cellulose Acetate Thin Film Composite Nanofiltration Membrane for Molecular Sieving and Catalytic Fouling Resistance

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Chinese Journal of Polymer Science 2023年第4期41卷 593-604,I0009页

作者： Hai-Bo Lin Jian-Guo Zhao Na Lu Qiu Han Jian-Qiang Wang Jian-Min Guan Xiao Wang Fu Liu Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo315201China Qinghai University Qinghai810016China University of Chinese Academy of Sciences Beijing100049China

Nanofiltration(NF)membranes as high selective separators are appealing for molecular sieving,which still remains a great challenge for the mixed dyes with same charge.In this study,cellulose acetate(CA)membranes were firstly aminated by ethylene imine polymer(PEI),and then the thin film of metal organic frameworks(MOFs)were constructed onto aminated CA membrane through forward-diffusion,slow crystallization and in situ growth of Fe Co-Prussian blue(FeCo-PB)crystallization layers.The designed PB@CA composite NF membrane shows an ideal rejection for Congo red(CR)/methyl orange(MO)mixture solution,with 99.7%±0.2%for CR and 33.5%±2%for MO.In addition,the composite NF membrane demonstrated good efficiency for photocatalytic degradation of organic fouling(permeability recovery ratio was up to 92%)due to the active FeCo-PB micro-cubes.Thus,this work provides a practical strategy to prepare MOFs mediated thin film composite nanofiltration membrane for precise molecular sieving and catalytic antifouling performances.

关键词： Nanofiltration membrane Molecular sieving Catalytic fouling resistance Prussian blue