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Improvement in antibacterial ability and cell cytotoxicity of Ti-Cu alloy by anodic oxidation

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Rare Metals 2022年第2期41卷 594-609页

作者： Shuang Cao Zi-Ming Zhang Jia-Qi Zhang Ren-Xian Wang Xiao-Yan Wang Lei Yang Da-Fu Chen Gao-Wu Qin Er-Lin Zhang School of Materials Science and Engineering Key Laboratory for Anisotropy and Texture of MaterialsEducation Ministry of ChinaNortheastern UniversityShenyang 110819China Departments of Immunology College of Basic MedicineJiamusi UniversityJiamusi 154007China Laboratory of Bone Tissue Engineering Beijing Laboratory of Biomedical MaterialsBeijing Research Institute of Orthopaedics and TraumatologyBeijing Jishuitan HospitalBeijing 100035China School of Metallurgy Northeastern UniversityShenyang 110819China Research Center for Metallic Wires Northeastern UniversityShenyang 110819China

Ti-Cu alloy has potential to be used in plastic surgery and dental implants due to its strong antibacterialproperties,high strength and good corrosion *** this paper,Ti-5Cu was anodic-oxidized to enhance the surface *** influence of the oxidation on the corrosion resistance,antibacterial properties and biological properties was investigated.X-ray diffraction(XRD)and X-ray photoelectron spectroscopy(XPS)results showed that a double-layer oxide coating with dense inner layer and porous outside layer was formed on Ti-Cu *** oxide coating consisted mainly of TiO2,CuzO and small amount of CuO,improved the corrosion resistance of Ti-Cu alloy by one order of magnitude due to the formation of the dense oxide inner layer,but high Cu ion release was *** plate count results showed that the antibac-terial activity of Ti-Cu sample was improved to≥99%due to the comprehensive function of CuO and Cu_(2)O in the coating and Cu^(2+)*** test results showed that thecoating exhibited good cell compatibility,the porous sur-face structure improved the adhesion of cells,and Cu ion release promoted the cell proliferation.

关键词： Titanium-copper alloy anodic oxidation Corrosion resistance Antibacterial activity Cell adhesion Surface modification

A Study on the Relationship between anodic oxidation and the Thermal Load on the Aluminum Alloy Piston of a Gasoline Engine

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Fluid Dynamics & Materials Processing 2022年第1期18卷 57-70页

作者： Huali Guo Yi Liang Zhilong Zhang Yuanhua Chen School of Automotive Engineering Guilin University of Aerospace TechnologyGuilin541004China

In order to analyze the influence of the anodizing process on the thermal load of an aluminum alloy piston,dedicated temperature tests have been carried out using the Hardness Plug method and the results for the anodized piston have been compared with those obtained separately for an original aluminum *** addition,numerical simulations have been conducted to analyze the temperature field and thermal stress *** and experiments show that the maximum temperature of the anodized piston is 16.36%and 5.4%smaller than that of the original piston under the condition of maximum torque and maximum power,*** thermal stress of the temperature field of both pistons is within 50 Mpa,which meets the strength requirements of the material at high ***,the area with significant thermal stress of the anodized piston is significantly smaller than that of the original *** with the fatigue analysis data,it can be seen that the safety factor of the anodized piston greater than 1.8 is 99.13%.Therefore,adopting the anodizing process not only reduces the piston thermal load,but also helps to extend its life and improve its reliability.

关键词： Alloy piston thermal load anodic oxidation hardness plug

Capillary Performance of Nanoporous Aluminum Braided Wicks Prepared by anodic oxidation

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Nanomanufacturing and Metrology 2022年第4期5卷 370-380页

作者： Fei Gao Longsheng Lu Xiaokang Mei Yu-Xiang Yu Shitong Chai Yang Shen Yingxi Xie School of Mechanical and Automotive Engineering South China University of Technology381#Wushan RoadGuangzhou510641People’s Republic of China School of Chemistry and Chemical Engineering South China University of Technology381#Wushan RoadGuangzhou510641People’s Republic of China

With the rapid development of two-phase heat exchangers,the further improvement of the capillary performance of their internal wick faces a great *** an important technology in the surface treatment of aluminum alloys,anodic oxidation has been widely used to develop various functional *** this study,nanopores with diameters of 30–40 nm were fabricated on the surface of aluminum fibers through anodic oxidation under an oxalic acid *** showed that anodizing increased the specific surface area of the aluminum braid by 163 times,and changed its surface wettability from hydrophobic to superhydrophilic.A significant reduction in the effective capillary radius can substantially increase the capillary force of aluminum braids on the basis of capillary ***,the nanoporous aluminum braids can be used as a novel wick in the vapor chamber to improve its capillary *** rate-of-rise tests with ethanol and acetone were performed to characterize the capillary of this novel wick *** thermal imaging was utilized to monitor the capillary rise of aluminum braided *** capillary force of the anodized wicks was greater than that of a normal wick,and the maximum capillary rise height was 81 *** nanoporous aluminum braided wicks prepared by anodizing could be applied in heat transfer.

关键词： Nanoporous structures Capillary performance Aluminum braided wicks anodic oxidation Heat and mass transfer

anodic oxidation of azo dye C.I. Acid Red 73 by the yttrium-doped Ti/SnO2-Sb electrodes

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Frontiers of Chemical Science and Engineering 2013年第3期7卷 338-346页

作者： Li XU Zhi GUO Lishun DU School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China Tianjin Key Laboratory of Membrane Science and Desalination Technology Tianjin University Yianjin 30007Z China Hualu Engineering & Technology Co. Ltd Xi'an 710065 China

This work was conducted to study the ability of anodic oxidation of azo dye C.I. Acid Red 73 （ART3） using the yttrium-doped Ti/SnO2-Sb electrodes. The effects of Sb doping level, yttrium doping level, thermal decomposition temperature and cycle times of dip-coating thermal decomposition on the properties of the electrodes were investigated. The results showed that the excellent electrochemical activity of Ti/SnO2-Sb-Y electrode can be achieved at a 7：1 molar ratio of Sn：Sb and thermal decomposition temperature of 550~C. Moreover when the cycle times of dip-coating and thermal decomposition were up to 10 times, the performance of the electrode tends to be stable. The Ti/SnO2-Sb electrodes doped with yttrium （0.5 tool-%） showed the most excellent electrochemical activity. In addition, the influences of operating variables, including current density, initial pH, dye concentration and support electrolyte, on the colour removal, chemical oxygen demand （COD） removal and current efficiency were also investigated. Our results confirmed that the current efficiency increased with the concentrations of dye and sodium chloride. Moreover, increasing the current density and the initial pH would reduce the current efficiency.

关键词： SnO2-Sb yttrium doping anodic oxidation azo dyes

anodic　oxidation　of　Nickel　in　Molten(Li_(0.62),K_(0.38))_2CO_3

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Rare Metals 1997年第1期16卷 12-16页

作者：方百增刘新宇王新东段淑贞北京科技大学北京

The anodic oxidation of nickel in molten (Li 0.62 ,K 0.38 ) 2CO 3 was investigated by means of cyclic voltammetry, X ray diffraction and X ray photoelectron spectroscopy. The results indicate that two reac... 详细信息

关键词： Nickel Molten carbonate fuel cell anodic oxidation

Evolution of insoluble eutectic Si particles in anodic oxidation films during adipic–sulfuric acid anodizing processes of ZL114A aluminum alloys

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International Journal of Minerals,Metallurgy and Materials 2015年第3期22卷 302-308页

作者： Lei Hua Jian-hua Liu Song-mei Li Mei Yu Lei Wang Yong-xin Cui School of Materials Science and Engineering Beihang University Beijing Xinghang Mechanical-electrical Equipment CO. LTD.

The effects of insoluble eutectic Si particles on the growth of anodic oxide films on ZL114A aluminum alloy substrates were in- vestigated by optical microscopy （OM） and scanning electron microscopy （SEM）. The anodic oxidation was performed at 25℃ and a con- stant voltage of 15 V in a solution containing 50 g/L sulfuric acid and 10 g/L adipic acid. The thickness of the formed anodic oxidation film was approximately 7.13 μm. The interpore distance and the diameters of the major pores in the porous layer of the film were within the ap- proximate ranges of 10~20 nm and 5-10 nm, respectively. Insoluble eutectic Si particles strongly influenced the morphology of the anodic oxidation films. The anodic oxidation films exhibited minimal defects and a uniform thickness on the ZL114A substrates; in contrast, when the front of the oxide oxidation films encountered eutectic Si particles, defects such as pits and non-uniform thickness were observed, and pits were observed in the films.

关键词： aluminum alloys anodizing anodic oxidation thin films eutectic silicon particles

Preparation and crystalline phase of a TiO_2 porous film by anodic oxidation

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Rare Metals 2005年第4期24卷 330-335页

作者： WANG Wei TAO Jie ZHANG Weiwei TAO Haijun WANG Ling College of Material Science and Technology Nanjing University of Aeronautics ＆ Astronautics Nanjing 210016 China

Anatase titanium dioxide is an active photocatalyst, but it is difficult to immobilize on the substrate. A crystalline TiO2 porous film was prepared directly on the surface of pure titanium by anodic oxidation in this work. Constant voltage and constant current anodic oxidation were adopted with sulphuric acid used as the electrolyte, pure titanium as the anode and copper as the cathode. The morphology and structure of the porous film on the substrate were analyzed with the aid of Field Emission Scanning Electron Microscopy （FESEM） and X-ray Diffraction （XRD）. The effects of the parameters of anodic oxidation （such as voltage, the concentration of sulphuric acid, anodization time and current density） on the aperture and the crystalline phase of the TiO2 porous film were systematically investigated. The results indicate that the increase of current density facilitates the augment of the aperture and the generation of anatase and mille. In addition, the forming mechanism of anatase and mille TiO2 porous films was discussed.

关键词： metal materials titanium oxide porous film anodic oxidation anatase rutile

Electrochemical incineration of dimethyl phthalate by anodic oxidation with boron-doped diamond electrode

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Journal of Environmental Sciences 2009年第10期21卷 1321-1328页

作者： HOU Yining QU Jiuhui ZHAO Xu LIU Huijuan State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China. Graduate School of the Chinese Academy of Sciences Beijing 100039 China

The anodic oxidation of aqueous solutions containing dimethyl phthalate （DMP） up to 125 mg/L with sodium sulfate （Na2SO4） as supporting electrolyte within the pH range 2.0-10.0 was studied using a one-compartment batch reactor employing a boron-doped diamond （BDD） as anode. Electrolyses were carded out at constant current density （1.5-4.5 mA/cm^2）. Complete mineralization was always achieved owing to the great concentration of hydroxyl radical （-OH） generated at the BDD surface. The effects of pH, apparent current density and initial DMP concentration on the degradation rate of DMP, the specific charge required for its total mineralization and mineralization current efficiency were investigated systematically. The mineralization rate of DMP was found to be pH-independent and to increase with increasing applied current density. Results indicated that this electrochemical process was subjected, at least partially, to the mass transfer of organics onto the BDD surface. Kinetic analysis of the temporal change of DMP concentration during electrolysis determined by High Performance Liquid Chromatography （HPLC） revealed that DMP decay under all tested conditions followed a pseudo first-order reaction. Aromatic intermediates and generated carboxylic acids were identified by Gas Chromatography- Mass Spectrometry （GC-MS） and a general pathway for the electrochemical incineration of DMP on BDD was proposed.

关键词： dimethyl phthalate anodic oxidation boron-doped diamond mineralization

Effect of intermetallic phases on the anodic oxidation and corrosion of 5A06 aluminum alloy

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International Journal of Minerals,Metallurgy and Materials 2015年第2期22卷 167-174页

作者： Song-mei Li Ying-dong Li You Zhang Jian-hua Liu Mei Yu School of Materials Science and Engineering Beihang University

Intermetallic phases were found to influence the anodic oxidation and corrosion behavior of 5A06 aluminum alloy. Scattered in- termetallic particles were examined by scanning electron microscopy （SEM） and energy dispersive spectroscopy （EDS） after pretreatment. The anodic film was investigated by transmission electron microscopy （TEM）, and its corrosion resistance was analyzed by electrochemical impedance spectroscopy （EIS） and Tafel polarization in NaC1 solution. The results show that the size of A1-Fe-Mg-Mn particles gradually decreases with the iron content. During anodizing, these intermetallic particles are gradually dissolved, leading to the complex porosity in the anodic film beneath the particles. After anodizing, the residual particles are mainly silicon-containing phases, which are embedded in the an- odic film. Electrochemical measurements indicate that the porous anodic film layer is easily penetrated, and the barrier plays a dominant role in the overall protection. Meanwhile, self-healing behavior is observed during the long immersion time.

关键词： aluminum alloys intermetallic particles anodic oxidation corrosion protective films