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

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

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Corrosion Resistance and Durability of Superhydrophobic Coating on AZ31 Mg Alloy via One-Step Electrodeposition

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Acta Metallurgica Sinica(English Letters) 2021年第1期34卷 25-38页

作者： Zheng-Zheng Yin zhao-qi zhang Xiu-Juan Tian Zhen-Lin Wang Rong-Chang Zeng Corrosion Laboratory for Light Metals College of Materials Science and EngineeringShandong University of Science and TechnologyQingdao 266590China College of Materials Science and Engineering Chongqing University of TechnologyChongqing 400065China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450002China

To enhance durability and adhesion of superhydrophobic surface,an integrated superhydrophobic calcium myristate(Ca[CH3(CH2)12COO]2)coating with excellent corrosion resistance was fabricated on AZ31 magnesium(Mg)alloy via one-step electrodeposition ***-emission scanning electron microscopy,Fourier transform infrared spectrometry and X-ray photoelectron spectroscopy as well as X-ray diff raction were employed to investigate the surface characteristics(morphology,composition and structure)of the *** of the coating was evaluated by means of contact and sliding ***,potentiodynamic polarization,electrochemical impedance spectroscopy and hydrogen evolution tests were conducted to characterize the corrosion *** indicated that the coating exhibited super-hydrophobicity with large static water contact angle(CA)and small sliding angle of 155.2°±1.5°and 6.0°±0.5°,respectively,owing to spherical rough structure and low surface energy(7.01 mJ m^(-2)).The average hydrogen evolution rate(HERa)and corrosion current density(icorr)of the coated sample were 5.3μL cm^(-2)h^(-1) and 5.60×10^(-9)A cm^(-2),about one and four orders of magnitude lower than that of AZ31 substrate,respectively,implying the excellent corrosion *** CA of the coating remained 155.6°±0.9°after soaking for 13 days,showing the super-hydrophobicity and stability of the ***,the large critical load(5004 mN)for the coating designated the outstanding adhesion to the substrate by nano-scratch test.

关键词： Magnesium alloy Electrodeposition Durability Super-hydrophobicity Adhesion Corrosion resistance

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Phase Transformation and Magnetic Properties of Mechanically Alloyed PrCo5-based Magnets

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Journal of Materials Science & Technology 2006年第6期22卷 843-845页

作者： Xinguo zhao Zhidong zhang qi YAO Jinjun LIU Weijun REN Wei LIU Dianyu GENG Shenyang National Laboratory for Materials Science International Centre for Materials Physics Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

PrCo5-based nanograin Pr=CO100-x （x=14-22） alloys with high coercivity were synthesized by mechanical alloying and subsequent annealing. The crystallization, phase components and magnetic properties of the alloys were investigated systematically. The main phase of the alloy for x=14 is Pr2CO17 with rhombohedral Th2Zn17-type. The amount of the Pr2CO17 phase decreases with increasing Pr content, and a nearly single phase PrCo5 with hexagonal CaCu5-type is formed in Pr18Co81 alloy. Further increase in the Pr content leads to the formation of another magnetically hard Pr2Co7 phase with its Curie temperature about 350℃. Remanences decrease monotonously with increasing Pr content, whereas the coercivities increase, reaching a maximum of 2040 kA/m （25.6 kOe） in Pr19CO81 powders milled for 5 h and annealed at 973 K for 2 min, and then decrease for higher Pr content. The high coercivity is attributed to the high anisotropy field of the PrCo~ phase and its nanoscale grain size.

关键词： Pr-Co magnets Phase transformation Magnetic properties Mechanical alloying

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

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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

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In vitro degradation of pure magnesium-the synergetic influences of glucose and albumin

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Bioactive Materials 2020年第2期5卷 318-333页

作者： Wei Yan Yi-Jie Lian Zhi-Yuan zhang Mei-qi Zeng zhao-qi zhang Zheng-Zheng Yin Lan-Yue Cui Rong-Chang Zeng Corrosion Laboratory for Light Metals College of Material Science and EngineeringShandong University of Science and TechnologyQingdao266590China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou450002China

The biocorrosion of magnesium in the external physiological environment is still difficult to accurately evaluate the degradation behavior in vivo,particularly,in the microenvironment of the patients with hyperglycemia or ***,we explored the synergistic effects of glucose and protein on the biodegradation of pure magnesium,so as to have a deeper understanding the mechanism of the degradation in *** surface morphology and corrosion product composition of pure magnesium were investigated using SEM,EDS,FTIR,XRD and *** effect of glucose and albumin on the degradation rate of pure magnesium was investigated via electrochemical and immersion *** adsorption of glucose and albumin on the sample surface was observed using fluorescence *** results showed that the presence of 2 g/L glucose changed the micromorphology of corrosion products on the magnesium surface by reacting with metal cations,thus inhibiting the corrosion of pure *** formed a barrier layer to protect the magnesium at early stage of *** chelation reaction between protein and magnesium surface might accelerate the degradation at later *** may be a critical glucose(albumin)*** of pure magnesium was inhibited at low concentrations and promoted at high *** synergistic effect of glucose and protein restrained the adsorption of aggressive chloride ions to a certain extent,and thus inhibited the degradation of pure magnesium ***,XPS results indicated that glucose promoted the adsorption of protein on the sample surface.

关键词： Pure magnesium Albumin Degradation Glucose Biomaterial

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Advances in coatings on magnesium alloys for cardiovascular stents-A review

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Bioactive Materials 2021年第12期6卷 4729-4757页

作者： zhao-qi zhang Yong-Xin Yang Jing-An Li Rong-Chang Zeng Shao-Kang Guan School of Material Science and Engineering&Henan Key Laboratory of Advanced Magnesium Alloy&Key Laboratory of Materials Processing and Mold Technology(Ministry of Education) Zhengzhou University100 Science RoadZhengzhou450001PR China Corrosion Laboratory for Light Metals College of Material Science and EngineeringShandong University of Science and TechnologyQingdao266590China

Magnesium(Mg)and its alloys,as potential biodegradable materials,have drawn wide attention in the cardiovascular stent field because of their appropriate mechanical properties and ***,the occurrence of thrombosis,inflammation,and restenosis of implanted Mg alloy stents caused by their poor corrosion resistance and insufficient endothelialization restrains their anticipated clinical *** surface treatment tactics have mainly striven to modify the Mg alloy for inhibiting its degradation rate and enduing it with biological *** review focuses on highlighting and summarizing the latest research progress in functionalized coatings on Mg alloys for cardiovascular stents over the last decade,regarding preparation strategies for metal oxide,metal hydroxide,inorganic nonmetallic,polymer,and their composite coatings;and the performance of these strategies in regulating degradation behavior and *** research direction is also concisely discussed to help guide biological functionalized strategies and inspire further *** is hoped that this review can give assistance to the surface modification of cardiovascular Mg-based stents and promote future advancements in this emerging research field.

关键词： Magnesium alloy Cardiovascular stent Surface modification Rapid endothelialization Functional properties

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Protein conformation and electric attraction adsorption mechanisms on anodized magnesium alloy by molecular dynamics simulations

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Journal of Magnesium and Alloys 2022年第11期10卷 3143-3155页

作者： zhao-qi zhang Hong-Yan Wang Li Wang Xiao-Bo Chen Shao-Kang Guan Cun-Guo Lin Rong-Chang Zeng Corrosion Laboratory for Light Metals College of Material Science and EngineeringShandong University of Science and TechnologyQingdao 266590China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450002China State Key Laboratory for Marine Corrosion and Protection Luoyang Ship Material Research InstituteQingdao 266101China School of Engineering RMIT UniversityCarlton VIC 3053Australia

Protein adsorption preferentially occurs and significantly affects the physicochemical reactions once the biodegradable magnesium alloys as bone replacements have been implanted. To date, interactions mechanisms between Mg implants and proteins remain unclear at a molecular level. Thereby, a combination of molecular dynamic(MD) simulations and experimental exploration is used to investigate the adsorption behavior and conformational change of bovine serum albumin(BSA), a representative protein of blood plasma, upon the surface of microarc oxidation(MAO) coated Mg alloy AZ31. The influences of absorbed proteins on the cytocompatibility of MAO coating are evaluated by virtue of cytotoxicity assay. Results indicate that the negatively charged O atoms(BSA) exhibit strong interaction with Mg^(2+) ions of Mg(OH)_(2), revealing that BSA molecules are ionically adsorbed on the AZ31 surface. Interestingly, MD simulation reveals that MAO coating demonstrates superior ability to capture BSA molecules during the process of adsorption owing to strong electric attraction between the negatively charged O atoms in BSA molecules with Mg atoms of MgO in MAO coating. Moreover, the α-helix part of absorbed BSA molecules on AZ31 substrate and MAO coating markedly decreases with an increase in β-sheet, β-turn and unordered contents, which is attributed to the reduction in the number of hydrogen bonds in BSA molecules. Furthermore, the adsorbed BSA molecules improve the cytocompatibility of MAO coating since the positively charged-NH_(3)^(+) group and β-sheet content of absorbed BSA molecules mediate the cell adhesion by interacting with the negatively charged cell membrane.

关键词： Magnesium alloy Molecular dynamics simulations Protein Conformation Biomaterial

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Biodegradation behavior of micro-arc oxidation coating on magnesium alloy-from a protein perspective

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Bioactive Materials 2020年第2期5卷 398-409页

作者： zhao-qi zhang Li Wang Mei-qi Zeng Rong-Chang Zeng M.Bobby Kannan Cun-Guo Lin Yu-Feng Zheng Corrosion Laboratory for Light Metals College of Material Science and EngineeringShandong University of Science and TechnologyQingdao266590China State Key Laboratory for Marine Corrosion and Protection Luoyang Ship Material Research InstituteQingdao266101China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou450002China Biomaterials and Engineering Materials(BEM)Laboratory College of ScienceTechnology and EngineeringJames Cook UniversityTownsville4811Australia State Key Laboratory for Turbulence and Complex Systems and Department of Materials Science and Engineering College of EngineeringPeking UniversityBeijing100871China

Protein exerts a critical influence on the degradation behavior of absorbable magnesium(Mg)-based ***,the interaction mechanism between protein and a micro-arc oxidation(MAO)coating on Mg alloys remains ***,a MAO coating was fabricated on AZ31 Mg *** its degradation behavior in phosphate buffer saline(PBS)containing bovine serum albumin(BSA)was investigated and compared with that of the uncoated *** morphologies and chemical compositions were studied using Field-emission scanning electron microscope(FE-SEM),Fourier transform infrared spectrophotometer(FT-IR)and X-ray diffraction(XRD).The degradation behavior of the bare Mg alloy and its MAO coating was studied through electrochemical and hydrogen evolution *** assay was applied to evaluate the biocompatibility of Mg alloy substrate and MAO *** indicated that the presence of BSA decreased the degradation rate of Mg alloy substrate because BSA(RCH(NH2)COO‾)molecules combined with Mg2+ions to form(RCH(NH2)COO)2Mg and thus inhibited the dissolution of Mg(OH)2 by impeding the attack of Cl‾*** the case of MAO coated Mg alloy,the adsorption of BSA on MAO coating and the formation of(RCH(NH2)COO)2Mg exhibited a synergistic effect and enhanced the corrosion resistance of the coated alloy ***,cell bioactive assay suggested that the MAO coating had good viability for MG63 cells due to its high surface area.

关键词： Magnesium alloy Protein Degradation Micro-arc oxidation Biocompatibility

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Degradation and biocompatibility of one-step electrodeposited magnesium thioctic acid/magnesium hydroxide hybrid coatings on ZE21B alloys for cardiovascular stents

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Journal of Magnesium and Alloys 2024年第1期12卷 120-138页

作者： zhao-qi zhang Bing-Zhi Li Pei-Duo Tong Shao-Kang Guan Li Wang Zheng-Hui qiu Cun-Guo Lin Rong-Chang Zeng School of Material Science and Engineering&Henan Key Laboratory of Advanced Magnesium Alloy&Key Laboratory of Materials Processing and Mold Technology(Ministry of Education) Zhengzhou University100 Science RoadZhengzhou 450001China State Key Laboratory for Marine Corrosion and Protection Luoyang Ship Material Research InstituteQingdao 266101China Corrosion Laboratory for Light Metals College of Material Science and EngineeringShandong University of Science and TechnologyQingdao 266590China

Constructing a functional hybrid coating appears to be a promising strategy for addressing the poor corrosion resistance and insufficient endothelialization of Mg-based ***,the steps for preparing composite coatings are usually complicated and ***,a novel composite coating,composed of bioactive magnesium thioctic acid(MTA)layer formed by deposition and corrosion-resistant magnesium hydroxide(Mg(OH)_(2))layer grown in situ,is simply fabricated on ZE21B alloys via one-step *** electron microscopy(SEM)shows that the electrodeposited coating has a compact and uniform *** the high adhesion of the MTA/Mg(OH)_(2)hybrid coating is also confirmed by the micro-scratch *** test,scanning kelvin probe(SKP),and hydrogen evolution measurement indicate that the hybrid coating effectively reduces the degradation rate of Mg *** experiment and cell culture trial detect that the composite coating is of fine ***,the preparation mechanism of MTA/Mg(OH)_(2)hybrid coatings is discussed and *** coating shows a great potential application for cardiovascular stents.

关键词： Magnesium alloy Corrosion resistance Hybrid coating Endothelialization Biocompatibility

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Effects of wind-dispelling drugs and deficiency-nourishing drugs of Houshiheisan compound prescription on astrocyte activation and inflammatory factor expression in the corpus striatum of cerebral ischemia rats

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Neural Regeneration Research 2012年第24期7卷 1851-1857页

作者： qiuxia zhang Hui zhao Lei Wang qi zhang Haizheng Wang College of Traditional Chinese Medicine Capital Medical UniversityBeijing 100069China

This study explored protective effects of Houshiheisan and its compound prescription of wind-dispelling drugs and deficiency-nourishing drugs on cerebral ischemia in terms of astrocyte activation and inflammatory factor *** suggested that Houshiheisan lessened neuronal degeneration in the corpus striatum on the ischemic side of rats following cerebral ischemia/reperfusion injury,contributed to astrocyte activation and glial fibrillary acidic protein expression in the corpus striatum and decreased the levels of interleukin-2,interleukin-6, interleukin-1βand tumor necrosis factor-α.Factor analysis results demonstrated that deficiency-nourishing drugs were more beneficial in protecting neurons and upregulating glial fibrillary acidic protein expression than wind-dispelling ***,wind-dispelling drugs were more effective in increasing the number of glial fibrillary acidic protein-positive cells and reducing inflammatory factor expression than deficiency-nourishing *** indicate that different ingredients of Houshiheisan suppress cerebral ischemic injury by promoting astrocyte activation and diminishing inflammatory factor expression.

关键词： Houshiheisan glial fibrillary acidic protein corpus striatum interleukin tumor necrosis factor-α cerebral ischemia neuronal protection neural regeneration

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