检索结果-南通市图书馆

Adsorption and Vibration of O on the Pt Stepped Surfaces

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2005年第8期24卷 965-972页

作者： dong chen-chu DIAO Zhao-Yu WANG Ze-Xin HAO Ce Department of Chemistry Shandong Normal University Jinan Shandong 250014 China School of Chemical Engineering Dalian University of Technology Dalian Liaoning 116024 China Department of Chemistry Binzhou University Binzhou Shandong 256600 China

The 5-parameter Morse potential （5-MP） of interaction between an adatom and metal surface cluster is put forward and performed on O-Pt stepped surface systems. We have primarily studied O/Pt（331）, O/Pt（221） and O/Pt（553） systems and drawn some conclusions from the calculated results in good agreement with experimental and theoretical information. The O atom adsorbs stably near the step, so the step is the active place in the reaction. There are two types of atomic states, β1 and β2, in the adsorbed systems, corresponding to the three-fold states and four-fold long-bridged state behind the step respectively. Moreover, the length of （Ⅲ） terrace affects weakly the properties of all critical points in these systems.

关键词： O-Pt system 5-MP adsorption vibration stepped surfaces

Corrosion resistance of self-cleaning silane/polypropylene composite coatings on magnesium alloy AZ31

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2020年第6期41卷 43-55页

作者： Zhao-Qi Zhang Rong-Chang Zeng Cun-Guo Lin Li Wang Xiao-Bo chen dong-chu chen Corrosion Laboratory for Light Metals College of Material Science and EngineeringShandong University of Science and TechnologyQingdao 266590China State Key Laboratory for Marine Corrosion and Protection Luoyang Ship Material Research InstituteQingdao 266101China School of Engineering RMIT UniversityCarlton 3053VICAustralia School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450002China School of Materials Science and Energy Engineering Foshan UniversityFoshan 528000China

Magnesium(Mg)and its alloys have been widely used in a variety of industrial fields,however,the high corrosion rate and surface contamination restrict their *** this study,a corrosion-resistant polymer coating with self-cleaning properties on Mg alloy AZ31 was successfully fabricated via a pretreatment of amino-silane(poly(3-aminopropyl)trimethoxysilane,PAPTMS)and subsequently covered with a polypropylene(PP)*** morphology and chemical compositions were examined using field-emission scanning electron microscopy(FE-SEM),X-ray diffraction(XRD),and Fourier transform infrared spectrophotometry(FT-IR)and X-ray photoelectron spectroscopy(XPS)as *** angle was measured to determine hydrophobicity of the composite *** permeability of the coatings was evaluated through electrochemical impedance spectroscopy(EIS).Corrosion resistance of the coating was investigated using electrochemical and hydrogen evolution *** indicated that PAPTMS/PP coatings possessed a micrometer-scaled porous spherical microstructure,and super-hydrophobicity with high water contact angle(162±3.4°)and low sliding angle(5±0.6°)due to the low surface energy(10.38 mJ/m2).Moreover,the coating exhibited a smaller water diffusion coefficient(8.12×10-10 cm2/s)and water uptake volume fraction(24.5%),demonstrating low water permeability and good physical barrier *** a result,the corrosion current density of PAPTMS/PP coating exhibited approximately three orders of magnitude lower than that of the AZ31 substrate,suggesting excellent corrosion ***,corrosion-resistant mechanism of the hybrid coating was proposed.

关键词： Magnesium alloy Polymer coating Hydrophobicity Corrosion Water permeability

Corrosion resistance of Mg（OH）2/Mg-Al-layered double hydroxide coatings on magnesium alloy AZ31:influence of hydrolysis degree of silane

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2019年第7期38卷 629-641页

作者： Qing-Song Yao Zhong-Chao Li Zai-Meng Qiu Fen Zhang Xiao-Bo chen dong-chu chen Shao-Kang Guan Rong-Chang Zeng College of Materials Science and Engineering Shandong University of Science and Technology Qingdao 266590 China School of Engineering RMIT University Carlton VIC 3053 Australia School of Materials Science and Energy Engineering Foshan University Foshan 528000. China School of Materials Science and Engineering Zhengzhou University Zhengzhou 450002 China

Mg(OH)2/Mg-Al-layered double hydroxide (LDH) coatings were modified with methyltrimethoxysilane (MTMS) on magnesium alloys. Effect of hydrolysis degree of silane solution on coating formation was investigated. Chemical compositions and surface morphologies of the coatings were examined using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and field-emission scanning electronic microscopy (FESEM). Results indicated that the composite coatings consisted of polymethyltrimethoxysilane (PMTMS), LDH and Mg(OH)2. Electrochemical and hydrogen evolution measurements revealed that the composite coatings possessed good corrosion resistance, especially the ones prepared in a high hydrolysis degree of silane. The optimum corrosion resistance of the composite coati ng was LDH/PMTMS-3 coating, which had the lowest value of corrosion current density (5.537×10^-9 A·cm^-2) and a dense *** mechanism for coating formation and corrosion process of MTMS-modified Mg(OH)2/Mg-Al-LDH coatings were discussed.

关键词： Magnesium alloy Layered double hydroxide (LDH) Silane Coating Corrosion resistance

Corrosion resistance and superhydrophobicity of one-step polypropylene coating on anodized AZ31 Mg alloy

在线全文

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2021年第4期9卷 1452-1466页

作者： Zhao-Qi Zhang Li Wang Mei-Qi Zeng Rong-Chang Zeng Cun-Guo Lin Zhen-Lin Wang dong-chu chen Qiang Zhang Corrosion Laboratory for Light Metals College of Material Science and EngineeringShandong University of Science and TechnologyQingdao 266590China State Key Laboratory for Marine Corrosion and Protection Luoyang Ship Material Research InstituteQingdao 266101China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450002China College of Materials Science and Engineering Chongqing University of TechnologyChongqing 400065China School of Materials Science and Energy Engineering Foshan UniversityFoshan 528000China

Superhydrophobic coatings have been considerably used in corrosion and its protection of metallic *** the comprehensive performance(hydrophobicity,bonding strength,and corrosion resistance,etc.)of the top coating may be highly dependent on the physical and chemical properties of the primer or under ***,an integrated superhydrophobic polypropylene(PP)coating was fabricated on the micro-arc oxidized Mg substrate via one-step *** morphologies and chemical compositions of the composite coating were examined through Fourier transform infrared spectroscopy(FT-IR),X-ray diffraction(XRD),and field-emission scanning electron microscopy(FESEM)together with X-ray photoelectron spectroscopy(XPS).The surface wettability of the coating was determined by contact angle and sliding *** corrosion-resistant performance was evaluated via electrochemical and immersion *** results showed that the hybrid coating possessed micron-scaled granular structure on the surface with a high water contact angle of 167.2±0.8°and a low water sliding angle of 2.7±0.5°.The corrosion resistance of superhydrophobic coating was obviously enhanced with a low corrosion current density of 8.76×10^(−9)A/cm^(2),and the coating still maintained integrity after 248 h of immersion in 3.5wt%NaCl aqueous *** MAO coating provides better adhesion of PP to the ***,the superhydrophobic coating exhibited superior bonding strength,corrosion resistance and durability.

关键词： Magnesium alloy Corrosion resistance Superhydrophobicity Bonding strength Polymer coating

In vitro degradation and cytocompatibility of a low temperature in-situ grown self-healing Mg-Al LDH coating on MAO-coated magnesium alloy AZ31

在线全文

学校读者我要写书评

暂无评论

Bioactive Materials 2020年第2期5卷 364-376页

作者： Chang-Yang Li Ling Gao Xiao-Li Fan Rong-Chang Zeng dong-chu chen Ke-Qian Zhi Corrosion Laboratory for Light Metals College of Materials Science and EngineeringShandong University of Science and TechnologyQingdao266590China Department of Oral and Maxillofacial Surgery The Affiliated Hospital of Qingdao UniversityQingdaoShandong266555China Key Lab of Oral Clinical Medicine The Affiliated Hospital of Qingdao UniversityQingdaoShandong266555China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou450002China School of Materials Science and Energy Engineering Foshan UniversityFoshan528000China

Basically,Mg–Al layered double hydroxide(LDH)coatings are prepared on the surface of micro-arc oxidation(MAO)coated magnesium(Mg)alloys at a high temperature or a low pH *** scenario leads to the growth rate of LDH coating inferior to the dissolution rate of the MAO *** in turn results in limited corrosion resistance of the composite *** this study,a Mg–Al LDH coating on MAO-coated Mg alloy AZ31 is prepared through a water bath with a higher pH(13.76)at a lower temperature(60℃).FE-SEM,EDS,XRD,XPS,and FT-IR are applied to analyze the surface morphology,chemical compositions,and growth *** polarization,electrochemical impedance spectroscopy(EIS)and hydrogen evolution tests are employed to evaluate the corrosion resistance of the *** results disclose that the MAO coating is completely covered by the nanosheet-structured LDH coating with a thickness of approximately 3.8μ*** corrosion current density of the MAO-LDH composite coating is decreased four orders of magnitude in comparison to its substrate;the presence of a wide passivation region in anodic polarization branch demonstrates its strong self-healing ability,indicating the hybrid coating possesses excellent corrosion *** formation mechanism of the LDH coating on the MAO-coated Mg alloy is ***,the cytocompatibility is assessed via an indirect extraction test for MC3T3-E1 pre-osteoblasts,which indicates an acceptable cytocompatibility of osteoblasts for the composite coating.

关键词： Magnesium alloy Micro-arc oxidation Layered double hydroxide Corrosion resistance Cytocompatibility

Corrosion resistance of bioinspired DNA-induced Ca-P coating on biodegradable magnesium alloy

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2019年第1期7卷 144-154页

作者： Ping Liu Jia-Min Wang Xiao-Tong Yu Xiao-Bo chen Shuo-Qi Li dong-chu chen Shao-Kang Guan Rong-Chang Zeng Lan-Yue Cui College of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590China School of Engineering RMIT UniversityCarlton 3053Australia School of Materials Science and Energy Engineering Foshan UniversityFoshan 528000China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450002China

Bioinspired coatings with decreased corrosion rate and enhanced bond strength are at the core of future clinic applications on degradable magnesium(Mg)-based *** hybrid of organic and inorganic compounds offers a strategy to fabricate biodegradable,biocompatible and compact coatings on biomedical Mg ***,a comparison with and without DNA addition was made on the corrosion resistance and adhesion strength of Ca-P coatings fabricated on AZ31 alloy via hydrothermal *** morphology,chemical composition,and crystallographic structure of the coatings were investigated by means of SEM,EDS and FTIR as well as XRD before and after corrosion *** resistance was evaluated via potentiodynamic polarization curves,electrochemical impedance spectroscopy(EIS)and hydrogen evolution tests in Hank’s *** show that the coatings are mainly characterized by tricalcium phosphate(TCP),dicalcium phosphate anhydrous(DCPA)and calcium-deficient hydroxyapatite(CDHA).The presence of DNA leads to the formation of Ca-P coating with improved corrosion resistance and adhesion ***,the formation mechanism for DNA-induced Ca-P coating is *** DNA-induced Ca-P coating exhibits a promising future for controlling the corrosion rate of biodegradable Mg alloys.©2019 Published by Elsevier *** behalf of Chongqing University.

关键词： DNA Corrosion resistance Biodegradability Magnesium alloys Coatings

Corrosion resistance of a silane/ceria modified Mg-Al-layered double hydroxide on AA5005 aluminum alloy

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Materials Science 2019年第4期13卷 420-430页

作者： Wei WU Fen ZHANG Yu-Chao LI Yong-Feng ZHOU Qing-Song YAO Liang SONG Rong-Chang ZENC Sie Chin TJONG dong-chu chen College of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590China School of Materials Science and Engineering Liaocheng UniversityLiaocheng 252059China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450002China Department of Physics City University of Hong KongTat Chee AvenueHong KongChina School of Materials Science and Energy Engineering Foshan UniversityFoshan 528000China

The present work aimed at assessing the electrochemical behavior and the corrosion inhibition performance of Mg-Al-layered double hydroxide(LDH)coatings modified with methyltrimethoxysilane(MTMS)and cerium nitrate on AA5005 aluminum *** chemical compositions and surface morphologies of the coatings were investigated by XRD,FT-IR and FE-SEM,while their corrosion resistance was evaluated by electrochemical and immersion *** optimum corrosion resistance of the composite coatings was obtained by adding 10^−2 mol·L^−1 cerium *** excess addition of cerium nitrate resulted in a loose structure and poor corrosion resistance of the *** corrosion mechanism of the composite coatings was proposed and discussed.

关键词： aluminum alloy layered double hydroxide polymer coating cerium oxide corrosion resistance

Advances in bioorganic molecules inspired degradation and surface modifications on Mg and its alloys

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2022年第3期10卷 723-745页

作者： Lei Cai Di Mei Zhao-Qi Zhang Yuan-ding Huang Lan-Yue Cui Shao-Kang Guan dong-chu chen M.Bobby Kannan Yu-feng Zheng Rong-Chang Zeng Corrosion Laboratory for Light Metals College of Materials Science and EngineeringShandong University of Science and TechnologyQingdao 266590China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450002China MagIC-Magnesium Innovation Centre and Institute of Metallic Biomaterials Helmholtz-Zentrum HereonMax-Planck Straûe 1Geesthacht 21502Germany School of Materials Science and Energy Engineering Foshan UniversityFoshan 528000China School of Engineering University of NewcastleCallaghanNSW 2308Australia College of Science and Engineering James Cook UniversityTownsvilleQL 4811Australia School of Materials Science and Engineering Peking UniversityBeijing 100871China Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China

Mg alloys possess biodegradability,suitable mechanical properties,and biocompatibility,which make them possible to be used as biodegradable ***,the uncontrollable degradation of Mg alloys limits their general *** addition to the factors from the metallic materials themselves,like alloy compositions,heat treatment process and microstructure,some external factors,relating to the test/service environment,also affect the degradation rate of Mg alloys,such as inorganic salts,bioorganic small molecules,bioorganic *** influence of bioorganic molecules on Mg corrosion and its protection has attracted more and more *** this work,the cutting-edge advances in the influence of bioorganic molecules(i.e.,protein,glucose,amino acids,vitamins and polypeptide)and their coupling effect on Mg degradation and the formation of protection coatings were *** research orientations of biomedical Mg alloys in exploring degradation mechanisms in vitro were proposed,and the impact of bioorganic molecules on the protective approaches were also explored.

关键词： Magnesium alloy Biomaterial Bioorganic molecules Degradation Coating Glucose.

In vitro corrosion resistance,antibacterial activity and cytocompatibility of a layer-by-layer assembled DNA coating on magnesium alloy

在线全文

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2021年第1期9卷 266-280页

作者： Lan-Yue Cui Ling Gao Jing-Chao Zhang Zhe Tang Xiao-Li Fan Jia-cheng Liu dong-chu chen Rong-Chang Zeng Shuo-Qi Li Ke-Qian Zhi College of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590China Department of Oral and Maxillofacial Surgery The Affiliated Hospital of Qingdao UniversityQingdao 266555China Key Lab of Oral Clinical Medicine The Affiliated Hospital of Qingdao UniversityQingdao 266555China School of Materials Science and Energy Engineering Foshan UniversityFoshan 528000China

A chitosan/deoxyribonucleic acid(CHI/DNA)_(5)coating was constructed by layer-by-layer(LbL)assembly dip coating method with Mg(OH)_(2)coating as an inner protective layer on AZ31 alloy.X-ray diffractometry,X-ray photoelectron spectrometry,Fourier transform infrared spectroscopy and field-emission scanning electron microscopy were utilized to represent the chemical compositions and surface morphologies of the *** tests and hydrogen evolution measurements were implemented to confirm the good corrosion resistance of the composite coating in artificial body *** activity of the composite coatings was tested via the plate-counting method,and the cytotoxicity of the samples was appraised by MTT assay and Live/dead staining.A double action was put into effect for the composite coating,which the inner Mg(OH)2 coating plays the part of physical barrier,and the outer(CHI/DNA)5 coating is employed as an inducer to fabricate a biocompatible Ca-P corrosion product coating during immersion,making up for its thin ***,the composite coating is also beneficial for the growth of bone,resulting from the biomineralization effect of the outer polyelectrolyte *** good antibacterial property of the(CHI/DNA)5/Mg(OH)2 coating is ascribed to the contact-killing strength of ***,the obtained(CHI/DNA)5/Mg(OH)2 coating has a wide application prospect in the field of Mg-based bone implantation.

关键词： Magnesium alloys Coatings Layer-by-layer assembly Biomaterials Antibacterial properties Corrosion