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One-pot scalable in situ growth of highly corrosion-resistant MgAl-LDH/MBT composite coating on magnesium alloy under mild conditions

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Journal of Materials Science & Technology 2021年第33期92卷 225-235页

作者： Ting Hu yuejun ouyang Zhi-Hui Xie Liang Wu Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province College of Chemistry and Chemical EngineeringChina West Normal UniversityNanchong 637002China Hunan Engineering Laboratory for Preparation Technology of Polyvinyl Alcohol(PVA)Fiber Material Huaihua UniversityHuaihua 418000China College of Materials Science and Engineering/National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China

Current corrosion-resistant layered double hydroxide(LDH)coating on Mg alloy is usually in situ grown in autoclave by hydrothermal methods under high temperature and high-pressure conditions,which is unfavorable for industrial *** report that an inhibitor(2-mercaptobenzothiazole,MBT)incorporated composite(Mg Al-LDH/MBT)coating can be in situ deposited on bare AZ31 Mg alloy surface with the assistance of a chelating agent(ethylenediaminetetraacetic acid)under a relatively low temperature(95℃)and ambient pressure by a one-pot *** successful formation of LDH/MBT composite coating is confirmed by a series of characterizations,such as X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),and energy dispersive spectroscopy(EDS).The corrosion resistance of the composite coating is evaluated by means of hydrogen evolution measurement,electrochemical impedance spectroscopy(EIS),Tafel polarization curves,and neutral salt spray *** tests show that the LDH/MBT composite coating has a very low corrosion current density(1.7310^(-8)A cm^(-2)),an extremely high charge transfer resistance(2.336 M cm^(2)),and does not show any corrosion pits even after 15 d of exposure to a Na Cl solution or 7 d of exposure to salt fog environment,manifesting the good and robust corrosion ***,the deposition and corrosion protection mechanisms of the Mg Al-LDH/MBT composite coating are also discussed and proposed based on the EDS characterization of the coating after long-time exposure.

关键词： Magnesium alloy Coating Corrosion resistance Layered double hydroxide

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Preparation of Core-Shell Structured Cobalt Coated Tungsten Carbide Composite Powders by Intermittent Electrodeposition

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Journal of Materials Science & Technology 2016年第11期32卷 1171-1178页

作者： Huan Zhong yuejun ouyang Gang Yu Bonian Hu Dalong Yan State Key Laboratory of Chemo/Biosensing and Chemometrics. College of Chemistry and Chemical Engineering Hunan University Changsha 410082 China Huaihua Key Laboratory of Functional Inorganic & Polymeric Materials Huaihua University Huaihua 418000 China Department of Materials and Chemical Engineering Hunan Institute of Technology Hengyang 421008 China

Core-shell structured cobalt coated tungsten carbide（WC/Co） composite powders were prepared by intermittent electrodeposition. The influence of process parameters such as current density, single deposition pulse, p H value and surfactants on the formation of WC/Co was investigated and characterized by scanning electron microscopy（SEM）, electrochemical station, acidometer and X-ray diffraction（XRD） *** composite powders with 54% cobalt content were fabricated at a current density of 16 A dm-2, with a load of 10 g dm-3WC powders and a stirring speed of 600 r min-1at an operation temperature of 40 ± 2 °C,and 90% current efficiency was obtained with a single deposition pulse of 1.5 min and single stirring pulse of 2 min during 12 min efficient electrodeposition time. The uniformly distributed WC/Co powders could be obtained in the cobalt electrolyte containing 300 mg dm-3PEG-2000. The spherical cobalt grains coated WC particles were prepared in the p H 4-5 electrolyte at the Co deposition rate of 0.58 g min-1. A practical process for high efficient production of WC/Co powders by electrodeposition was developed in the present work.

关键词： Composite powder Electrodeposition Dispersion Crystal structure

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Performance of Amperometric and Potentiometric Hydrogen Sensors

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Journal of Materials Science & Technology 2014年第11期30卷 1160-1165页

作者： yuejun ouyang Xiaojian Wang Gang Yu Zhengwei Song Xueyuan Zhang State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringHunan University Materials Science and Engineering Laboratory Huaihua University

The principle, design, construction and performance of the amperometric and potentiometric sensors for measuring the permeation rate of hydrogen through the wall of metal equipment were investigated in order to develop a new type of hydrogen sensor with high accuracy. The transient curves of hydrogen permeation under a given charging condition were employed to evaluate the performance of two types of hydrogen sensors. The relative deviation of the hydrogen concentration detected with two types of sensors under the same condition varied from 3.0% to 13%. The accuracy, response time, reproducibility, and installation were discussed and compared. Response time of the potentiometric sensor （E-sensor） was shorter than that of the amperometric sensor （I-sensor）. Both types of sensors exhibited good reproducibility. Development of I-sensor composed of a kind of proton conductor adhesives or non-fluid electrolytes which contain two functions of high electrical conductivity and a strong adhesion will be a promising prospect in order to measure hydrogen permeation at high temperature.

关键词： Hydrogen sensor Hydrogen diffusion Hydrogen embrittlement Nickel

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Electrochemical Fabrication of Pd-Ag Alloy Nanowire Arrays in Anodic Alumina Oxide Template

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Journal of Materials Science & Technology 2008年第6期24卷 850-856页

作者： Erhong YUE Gang YU yuejun ouyang Baicheng WENG Weiwei SI Liyuan YE State Key Laboratory of Chemo/Biosensing and Chemometrics Hunan University Changsha 410082 China Department of Chemistry and Chemical Engineering Huaihua College Huaihua 418008 China

The synthesis of Pd-Ag alloy nanowires in nanopores of porous anodic aluminum oxide （AAO） template by electrochemical deposition technique was reported. Pd-Ag alloy nanowires with 16%-25% Ag content are expected to serve as candidates of useful nanomaterials for the hydrogen sensors. Scanning electron microscopy （SEM） and energy dispersed X-ray spectroscopy （EDX） were employed to characterize the morphologies and compositions of the Pd-Ag nanowires. X-ray diffraction （XRD） was used to characterize the phase properties of the Pd-Ag nanowires. Pd-Ag alloy nanowire arrays with 17.28%-23.76% Ag content have been successfully fabricated by applying potentials ranging from -0.8 to -1.0 V （vs SCE）. The sizes of the alloy nanowires are in agreement with the diameter of AAO nanopores. The underpotential deposition of Ag＋ on Pd and Au plays an important role in producing an exceptionally high Ag content in the alloy. Alloy compositions can still be controlled by adjusting the ion concentration ratio of Pd^2＋ and Ag＋ and the electrodeposition processes. XRD shows that nanowires obtained are in the form of alloy of Pd and Ag.

关键词： Pd-Ag Alloy nanowires Anodic aluminum oxide template Electrodeposition

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Controlled Growth of Pt–Au Alloy Nanowires and Their Performance for Formic Acid Electrooxidation

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Journal of Materials Science & Technology 2016年第7期32卷 639-645页

作者： Yu Han yuejun ouyang Zhihui Xie Jinri Chen Fangfang Chang Gang Yu State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical Engineering Hunan University Changsha 410082 China College of Chemistry and Materials Engineering Huaihua University Huaihua 418000 China Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province College of Chemistry and Chemical Engineering China West Normal University Nanchong 637002 China

Pt-Au alloy nanowires have been controllably electrodeposited on microelectrodes by applying an al- ternating current and were used as the electrocatalyst for formic acid oxidation. The frequency and voltage of the alternating current and the electrolyte composition were adjusted to precisely control the mor- phologies, alloying structures and composition. The characteristics of Pt-Au alloy nanowires were analyzed by scanning electron microscopy, X-ray diffraction and transmission electron spectroscopy. Electrocatalytic performance of formic acid oxidation at Pt-Au alloy nanowires electrode was investigated by cyclic voltammetry and chronoamperometry. The results showed that the Pt-Au alloy nanowires possessed highly- crystalline morphologies, the controllable bimetallic composition and single-phase alloy structures, which mainly grow in the 〈111〉 crystal orientation. The electrocatalytic activity of formic acid oxidation strongly depended on the bimetallic Pt/Au composition. The PtjsAu6s alloy nanowires displayed superior electrocatalytic performance and high stability toward the electrooxidation of formic acid in acidic so- lution, owing to the ensemble effect of the Pt and Au components. These findings provided insights into the design of the Pt-Au bimetallic nanomaterials as electrocatalvsts for formic acid oxidation.

关键词： Pt-Au alloyNanowiresPhase structureFormic aciclElectrooxidation

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A self-healing coating based on facile pH-responsive nanocontainers for corrosion protection of magnesium alloy

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Journal of Magnesium and Alloys 2022年第3期10卷 904-919页

作者： yuejun ouyang Lin-Xin Li Zhi-Hui Xie Lili Tang Fuhui Wang Chuan-Jian Zhong Hunan Engineering Laboratory for Preparation Technology of Polyvinyl Alcohol(PVA)Fiber Material Huaihua UniversityHuaihua 418000PR China Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province/Institute of Synthesis and Application of Functional Materials College of Chemistry and Chemical EngineeringChina West Normal UniversityNanchong 637002PR China Shenyang National Laboratory for Materials Science Northeastern University3-11 Wenhua RoadShenyang 110819PR China Department of Chemistry State University of New York at BinghamtonBinghamtonNY 13902USA

The preparation of pH-responsive nanocontainers by typical silane modification of the mesoporous silica nanoparticle(MSN)surface is usually high-cost,complex,and time-consuming,which remains a great challenge for effective corrosion protection of magnesium ***,a new strategy to construct pH-responsive nanocontainers(MSN-MBT@LDH)is *** nanocontainers consist of corrosion inhibitor(2-mercaptobenzothiazole,MBT)loaded MSN core and layered double hydroxide(LDH)nanosheet shell serving as *** successful loading of MBT and encapsulation by LDH nanosheets were confirmed by a series of characterization such as scanning transmission electron microscopy coupled with energy dispersive X-ray spectroscopy(STEM-EDS)and N2 adsorption/desorption *** pH-responsive feature of the nanocontainers was demonstrated by determination of the MBT concentration in buffer solutions with different pH values.A smart corrosion protection system on Mg alloy is obtained by incorporating the synthesized nanocontainers into a self-assembled nanophase particle(SNAP)*** electrochemical tests and visual observations show that the hybrid coating has the best barrier properties and robustness in corrosion protection in NaCl corrosive solutions in comparison with the control *** present method simplifies the synthesis processes of nanocontainers and eliminates the potential detrimental effect of excess gatekeepers on the *** findings provide new insights into the preparation of scalable *** self-healing coatings are expected to have widespread applications for corrosion protection of Mg alloy and other metals.

关键词： Mg alloy Coating Corrosion Layered double hydroxide Nanocontainer.

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Preparation and Properties of Bio-Based Flame Retardant Polyvinyl Alcohol

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Journal of Renewable Materials 2021年第5期9卷 909-921页

作者： You Shu Qionglin Luo Hongwei Lin yuejun ouyang Xiaomin Zhang Liping Sheng Shengpei Su Country National and Local Joint Engineering Laboratory for New Petro-chemical Materials and Fine Utilization of Resources Hunan Normal UniversityChangsha410081China Hunan Engineering Laboratory for Preparation Technology of Polyvinyl Alcohol Fiber Material Huaihua UniversityHuaihua418000China

Polyvinyl alcohol (PVA) has been widely used in the fields of medical, food and packaging due to its excellentbiocompatibility, good fiber-forming and film-forming properties. However, the high flammability of PVA hasgreatly limited its wider applications. The flame-retardant PVA was prepared by melt blending of a bio-basedflame retardant (prepared from lignin, phosphoric acid and carbamide) with thermoplastic PVA (TPVA). Thechemical structure, morphology, thermal properties, mechanical properties, fire property and fluidity of thisflame retardant PVA were investigated by Fourier transform infrared spectrometer(FTIR), field emission scanning electron microscope(SEM), thermogravimetric analyzer(TGA), impact tester, universal testing machine,horizontal-vertical burning tester, limiting oxygen indexer(LOI) and melt flow rate meter(MFR). The resultsshowed that the prepared flame retardant had good compatibility with the PVA substrate;The impact strength,melt flow rate, fire property and char residue of this PVA material increased with the content of bio-based flameretardant. When the content of flame retardant was of 20%, the five indices including impact strength, meltflow rate, UL-94 level, LOI and char residual were 11.3 KJ/m^(2), 21.2 g/10 min, V-0 UL-94 level, 33.1%, and19.2%, respectively. This research can promote the high-value utilization of lignin and the application ofPVA in the fields of fire protection.

关键词： Bio-based flame retardant lignin ammonium polyphosphate polyvinyl alcohol

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Preparation and Properties of Bio-Based Flame Retardant L-APP/Poly(L-lactic acid)Composites

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Journal of Renewable Materials 2021年第12期9卷 2067-2076页

作者： Qionglin Luo Mingliang Wang Hui Zhang yuejun ouyang Hongwei Lin You Shu Shengpei Su Hunan Engineering Laboratory for Preparation Technology of Polyvinyl Alcohol Fiber Material Huaihua UniversityHuaihua418000China National and Local Joint Engineering Laboratory for New Petro-Chemical Materials and Fine Utilization of Resources Hunan Normal UniversityChangsha410081China

Poly(L-lactic acid)(PLLA)is a thermoplastic material with complete degradability,high biocompatibility and excellent mechanical *** can replace petroleum-based polymers are currently being used in the fields of packaging,agriculture,textiles,medical and so ***,PLLA’s extremely flammability greatly limits its wider *** bio-based flame retardant L-APP/PLLA composites was prepared by melt blending of the L-APP and *** morphology,impact properties,thermal properties and flame retardant properties of composites were investigated by field emission scanning electron microscope(SEM),impact tester,differential scanning calorimeter(DSC),thermogravimetric analyzer(TGA),limiting oxygen indexer(LOI)and horizontalvertical burning *** results showed that the degree of crystallization(X_(c))and LOI of L-APP/PLLA composites increased as increasing of L-APP ***’s more,the impact strength first increased and then decreased,the glass transition temperature(T_(g))and melting temperature(T_(m))do not changed *** impact strength of composites was 9.1 kJ/m^(2) at a 5 wt%loading for L-APP,which was the highest *** the content of L-APP was 20%,the LOI was 30.8%,the Xc was 42.3%and the UL-94 level was *** research can promote the value-added utilization of lignin and the application of PLLA in the fields of flame retardant materials.

关键词： Bio-based flame retardant lignin ammonium polyphosphate poly(L-lactic acid)

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Coupling a titanium dioxide based heterostructure photoanode with electroless-deposited nickel-phosphorus alloy coating on magnesium alloy for enhanced corrosion protection

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Journal of Materials Science & Technology 2022年第31期126卷 252-265页

作者： Yue Liu Feng Peng Guang-Ling Yang Zhi-Hui Xie Wenxin Dai yuejun ouyang Liang Wu Chuan-Jian Zhong Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province College of Chemistry and Chemical EngineeringChina West Normal UniversityNanchong 637002China Medical Research Center Department of OrthopedicsGuangdong Provincial People’s HospitalGuangdong Academy of Medical SciencesGuangzhou 510080China State Key Laboratory of Photocatalysis on Energy and Environment Fuzhou UniversityFuzhou 350116China Hunan Engineering Laboratory for Preparation Technology of Polyvinyl Alcohol(PVA)Fiber Material Huaihua UniversityHuaihua 418000China College of Materials Science and Engineering/National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China Department of Chemistry State University of New York at BinghamtonBinghamtonNY13902United States

The utilization of photoelectrochemical cathodic protection(PECCP)enables an indirect corrosion pro-tection of metals with low self-corrosion potential by introducing a metallic nickel ***,the ability to enhance the PECCP efficiency remains challenging because of the inherent property of the ***,this ability is demonstrated by coupling a covalent organic framework(TpBD)dec-orated TiO 2 photoanode(TiO 2/TpBD)with nickel coating on magnesium alloy for an effective corrosion *** composite photoanode showed direct PECCP for the nickel interlayer and indirect corro-sion protection of the magnesium *** composite structure of the nanotube array and the covalent organic framework for the photoanode were confirmed by field emission scanning electron microscopy(FESEM),transmission electron microscopy(TEM),and X-ray photoelectron spectroscopy(XPS).The en-hanced photoelectrochemical conversion capability and PECCP performance of the nickel-coated Mg alloy were evidenced by the results from electrochemical and photoelectrochemical measurements including Mott-Schottky curves,photoinduced potential variations,and electrochemical impedance spectroscopy(EIS).Lastly,a corrosion protection mechanism is proposed,where the enhanced PECCP efficiency is at-tributed to the formation of a direct Z-scheme heterojunction,which is substantiated by the results from valence band(VB)XPS and electron spin resonance characterizations.

关键词： Magnesium alloy Corrosion Nickel coating Electroless Photoelectrochemical cathodic protection

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无机盐溶液表面张力的影响研究

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中国科技信息 2009年第22期 42-43页

作者：欧阳跃军湖南怀化学院化学化工系

采用最大气泡压力法测量不同浓度无机盐水溶液的表面张力值。结果表明:一定温度下各组无机盐水溶液的表面张力随浓度的增加而增大;相同浓度条件下,在元素周期表中同主族阳离子与相同阴离子组成的盐溶液,其盐溶液的表面张力从上至下依次... 详细信息

采用最大气泡压力法测量不同浓度无机盐水溶液的表面张力值。结果表明:一定温度下各组无机盐水溶液的表面张力随浓度的增加而增大;相同浓度条件下,在元素周期表中同主族阳离子与相同阴离子组成的盐溶液,其盐溶液的表面张力从上至下依次增大;而同主族阴离子与相同阳离子组成的盐溶液,其盐溶液的表面张力从上至下依次减小。

关键词：表面张力最大气泡法盐溶液浓度

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