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Preparation and Properties of Cu-Containing High-entropy Alloy Nitride Films by Magnetron Sputtering on Titanium Alloy
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作者 DENG Wanrong YANG Wei +5 位作者 YU Sen LAN Nan MA Xiqun WANG Liqun GAO Wei CHEN Jian 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2024年第6期1586-1594,共9页
Magnetron sputtering deposition with regulated Cu target power was used for depositing Cu-containing high-entropy alloy nitride(Cu-(HEA)N)films on TC4 titanium alloy substrates.The microscopic morphologies,surface com... Magnetron sputtering deposition with regulated Cu target power was used for depositing Cu-containing high-entropy alloy nitride(Cu-(HEA)N)films on TC4 titanium alloy substrates.The microscopic morphologies,surface compositions,and thicknesses of the films were characterized using SEM+EDS;the anti-corrosion,wear resistance and antibacterial properties of the films in simulated seawater were investigated.The experimental results show that all four Cu-(HEA)N films are uniformly dense and contained nanoparticles.The film with Cu doping come into contact with oxygen in the air to form cuprous oxide.The corrosion resistance of the(HEA)N film without Cu doping on titanium alloy is better than the films with Cu doping.The Cu-(HEA)N film with Cu target power of 16 W shows the best wear resistance and antibacterial performance,which is attributed to the fact that Cu can reduce the coefficient of friction and exacerbate corrosion,and the formation of cuprous oxide has antibacterial properties.The findings of this study provide insights for engineering applications of TC4 in the marine field. 展开更多
关键词 titanium alloy high-entropy alloy nitride film magnetron sputtering properties
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A novel method towards improving the hydrogen storage properties of hypoeutectic Mg-Ni alloy via ultrasonic treatment 被引量:2
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作者 Xin Ding Ruirun Chen +4 位作者 Xiaoyu Chen Hongze Fang Qi Wang Yanqing Su Jingjie Guo 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2023年第3期903-915,共13页
Ultrasonic treatment has great contributions on modifying the morphology,dimension and distribution of constituent phases during solidification,which serve as dominate factors influencing the hydrogen storage performa... Ultrasonic treatment has great contributions on modifying the morphology,dimension and distribution of constituent phases during solidification,which serve as dominate factors influencing the hydrogen storage performance of Mg-based alloys.In this research,ultrasonic treatment is utilized as a novel method to enhance the de-/hydriding properties of Mg-2Ni(at.%)alloy.Due to ultrasonic treatment,the microstructure of as-cast alloy is significantly refined and homogenized.Ascribing to the increased eutectic boundaries and shortened distance insideα-Mg for hydrogen atoms diffusion,the hydrogen uptake capacities and isothermal de-/hydriding rates improve effectively,especially at lower temperature.The peak desorption temperature reduces from 392.99°C to 345.56°C,and the dehydriding activation energy decreases from 101.93 k J mol^(-1)to 88.65 k J mol^(-1).Weakened hysteresis of plateau pressures and slightly optimized thermodynamics are determined from the pressure-composition isotherms.Owing to the refined primary Mg,a larger amount of hydrogen with the higher hydriding proportion is absorbed in the first stage when hydrides nucleate in eutectic region and grow on primary Mg periphery subsequently before MgH2colonies impinging,resulting in the enhancement of hydrogenation rates and capacities. 展开更多
关键词 Hydrogen storage mg-ni alloy Ultrasonic treatment Dehydriding kinetics
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Self-repairing functionality and corrosion resistance of in-situ Mg-Al LDH film on Al-alloyed AZ31 surface 被引量:2
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作者 Yi-Xing Zhu Guang-Ling Song Peng-Peng Wu 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2023年第5期1567-1579,共13页
A novel Mg-Al LDH film was in-situ prepared hydrothermally in an alkaline aqueous solution on an Al-alloyed AZ31 substrate.The structural,chemical and functional characteristics of the film were explored by means of s... A novel Mg-Al LDH film was in-situ prepared hydrothermally in an alkaline aqueous solution on an Al-alloyed AZ31 substrate.The structural,chemical and functional characteristics of the film were explored by means of scanning electron microscope(SEM),X-ray diffraction(XRD),energy dispersive spectrometer(EDS),polarization curve,AC impedance and salt immersion tests,respectively.The anti-corrosion results indicated that the Mg-Al LDH film on the Al-alloyed AZ31 surface could effectively protect the AZ31 from corrosion attack even after 90 days of immersion in 3.5 wt.%NaCl solution.The protection performance is surprisingly better than most of the reported coatings on Mg alloys.More interestingly,when the Mg-Al LDH film was scratched,the exposed Al-alloyed surface might gradually release metal ions and re-generate dense LDH nano-sheets in the corrosive environment to inhibit the further corrosion there,exhibiting a self-repairing behavior.The combination of the benign long-term protection and desirable self-repairing performance in this new process of surface-alloying and LDH-formation may significantly extend the practical application of magnesium alloys. 展开更多
关键词 LDH film Surface alloying Corrosion resistance SELF-REPAIRING
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Electrochemical Hydrogen Charging on Corrosion Behavior of Ti-6Al-4V Alloy in Artificial Seawater 被引量:1
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作者 Yanxin Qiao Yue Qin +5 位作者 Huiling Zhou Lanlan Yang Xiaojing Wang Zhengbin Wang Zhenguang Liu Jiasheng Zou 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2024年第1期296-308,共13页
This study employs advanced electrochemical and surface characterization techniques to investigate the impact of electrochemical hydrogen charging on the corrosion behavior and surface film of the Ti-6Al-4V alloy.The ... This study employs advanced electrochemical and surface characterization techniques to investigate the impact of electrochemical hydrogen charging on the corrosion behavior and surface film of the Ti-6Al-4V alloy.The findings revealed the formation ofγ-TiH andδ-TiH_(2) hydrides in the alloy after hydrogen charging.Prolonging hydrogen charging resulted in more significant degradation of the alloy microstructure,leading to deteriorated protectiveness of the surface film.This trend was further confirmed by the electrochemical measurements,which showed that the corrosion resistance of the alloy progressively worsened as the hydrogen charging time was increased.Consequently,this work provides valuable insights into the mechanisms underlying the corrosion of Ti-6Al-4V alloy under hydrogen charging conditions. 展开更多
关键词 Ti-6Al-4V alloy Hydrogen charging Electrochemical corrosion Passive film
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Effect of air-formed film on corrosion behavior of magnesium-lithium alloys
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作者 Yanlong Ma Lei Liu +4 位作者 Xinxin Zhang Fei Guo Xiaorong Zhou Mingbo Yang Jingfeng Wang 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2023年第11期4325-4337,共13页
It is recently suggested that air-formed film plays an important role in controlling corrosion resistance of Mg-Li alloys. However, the structure of the air-formed film and its effect on corrosion resistance of Mg-Li ... It is recently suggested that air-formed film plays an important role in controlling corrosion resistance of Mg-Li alloys. However, the structure of the air-formed film and its effect on corrosion resistance of Mg-Li alloys has not been fully understood. Firstly, the air-formed films formed on α and β phases in a dual-phase LZ91 Mg-Li alloy after exposure to laboratory air for up to 48 h have been examined by SEM under the assistance of ultramicrotomy. Then, the effect of the air-formed film on surface potential and, consequently, corrosion/oxidation behavior of the alloy has been investigated. Finally, in order to exclude the influence from α phase, the structure of the air-formed film on β phase and its effect on corrosion/oxidation behavior of Mg-Li alloys have been studied based on a single-phase LA141 Mg-Li alloy. The results show that the air-formed film is thin and negligible on α phase but thick on β phase after prolonged exposure to laboratory air. The thick air-formed film on β phase has a multilayer structure with an inner layer consisting of Mg O/Mg(OH)_(2) and outer layer consisting of Li_(2)CO_(3), which greatly elevates the surface potential of β phase in air. Both LZ91 and LA141 Mg-Li alloys firstly undergo uniform corrosion and then filiform corrosion when immersed in Na Cl solution and the pre-existed air-formed film on β-Li phase can retard the occurrence of filiform corrosion in the alloys. 展开更多
关键词 Magnesium-lithium alloy Air-formed film Uniform corrosion Filiform corrosion
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Corrosion characteristics of single-phase Mg-3Zn alloy thin film for biodegradable electronics
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作者 Ji-Woo Gu Jae-Young Bae +7 位作者 Guangzhe Li Hae Won Hwang So-Hyeon Lee Sung-Geun Choi Ju-Young Kim Myoung-Ryul Ok Yu-Chan Kim Seung-Kyun Kang 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2023年第9期3241-3254,共14页
Biodegradable metals as electrodes, interconnectors, and device conductors are essential components in the emergence of transient electronics, either for passive implants or active electronic devices, especially in th... Biodegradable metals as electrodes, interconnectors, and device conductors are essential components in the emergence of transient electronics, either for passive implants or active electronic devices, especially in the fields of biomedical electronics. Magnesium and its alloys are strong candidates for biodegradable and implantable conducting materials because of their high conductivity and biocompatibility, in addition to their well-understood dissolution behavior. One critical drawback of Mg and its alloys is their considerably high dissolution rates originating from their low anodic potential, which disturbs the compatibility to biomedical applications. Herein, we introduce a single-phase thin film of a Mg-Zn binary alloy formed by sputtering, which enhances the corrosion resistance of the device electrode, and verify its applicability in biodegradable electronics. The formation of a homogeneous solid solution of single-phase Mg-3Zn was confirmed through X-ray diffraction and transmission electron microscopy. In addition, the dissolution behavior and chemistry was also investigated in various biological fluids by considering the effect of different ion species. Micro-tensile tests showed that the Mg-3Zn alloy electrode exhibited an enhanced yield strain and elongation in relation to a pure Mg electrode. Cell viability test revealed the high biocompatibility rate of the Mg-3Zn binary alloy thin film. Finally, the fabrication of a wireless heater demonstrated the integrability of biodegradable electrodes and highlighted the ability to prolong the lifecycle of thermotherapy-relevant electronics by enhancing the dissolution resistance of the Mg alloy. 展开更多
关键词 Biodegradable alloy Mg-3Zn binary alloy Solid-solution thin film electrode Biodegradable conductor Transient electronics
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Corrosion resistance of in-situ Mg-Al hydrotalcite conversion film on AZ31 magnesium alloy by one-step formation 被引量:15
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作者 曾荣昌 刘振国 +4 位作者 张芬 李硕琦 赫庆坤 崔洪芝 韩恩厚 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第6期1917-1925,共9页
In situ growth of nano-sized layered double hydroxides (LDH) conversion film on AZ31 alloy was synthesized by a urea hydrolysis method. The formation mechanism of the film was proposed. Firstly, the dissolved Mg2+ ... In situ growth of nano-sized layered double hydroxides (LDH) conversion film on AZ31 alloy was synthesized by a urea hydrolysis method. The formation mechanism of the film was proposed. Firstly, the dissolved Mg2+ ions deposited into a precursor film consisted of MgCO3 and Mgs(CO3)4(OH)2·4H2O; secondly, the precursor translated into the crystalline Mg(OH)2 in alkaline conditions; finally, the Mg2+ ions in Mg(OH)z were replaced by A13+ ions, Mg(OH)2 translated into the more stable LDH structure, simultaneously, the OH- ions in the interlayer were exchanged by CO32-, thus led to the formation of the LDH (Mg6Alz(OHh6CO3·4H2O) film. The results indicated that the LDH film characterized by interlocking plate-like nanostructures and ion-exchange ability significantly improved the corrosion resistance of the AZ31 Mg alloy. 展开更多
关键词 magnesium alloy HYDROTALCITE conversion film corrosion resistance ion-exchange
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Effects of boric acid on microstructure and corrosion resistance of boric/sulfuric acid anodic film on 7050 aluminum alloy 被引量:13
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作者 杜楠 王帅星 +1 位作者 赵晴 邵志松 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第7期1655-1660,共6页
The microstructure and corrosion resistance of different boric/sulfuric acid anodic(BSAA) films on 7050 aluminum alloy were studied by atomic force microscopy(AFM),electrochemical impedance spectroscopy(EIS) and... The microstructure and corrosion resistance of different boric/sulfuric acid anodic(BSAA) films on 7050 aluminum alloy were studied by atomic force microscopy(AFM),electrochemical impedance spectroscopy(EIS) and scanning Kelvin probe(SKP).The results show that boric acid does not change the structure of barrier layer of anodic film,but will significantly affect the structure of porous layer,consequently affect the corrosion resistance of anodic film.As the content of boric acid in electrolyte increases from 0 to 8 g/L,the resistance of porous layer(Rp) of BSAA film increases,the capacitance of porous layer(CPEp) decreases,the surface potential moves positively,the pore size lessens,and the corrosion resistance improves.However,the Rp,CPEp and surface potential will change towards opposite direction when the content of boric acid is over 8 g/L. 展开更多
关键词 aluminum alloy anodic film corrosion resistance boric acid
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Properties of dawsonite conversion film on AZ31 magnesium alloy 被引量:7
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作者 陈君 宋影伟 +1 位作者 单大勇 韩恩厚 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第4期936-942,共7页
An environmentally friendly method for synthesizing a dawsonite conversion film was developed to improve the corrosion resistance of AZ31 Mg alloy. The film was prepared by two steps: the AZ31 alloy was first immerse... An environmentally friendly method for synthesizing a dawsonite conversion film was developed to improve the corrosion resistance of AZ31 Mg alloy. The film was prepared by two steps: the AZ31 alloy was first immersed in an Al 2 (SO 4 ) 3 solution venting CO 2 gas to form a precursor film, and then the precursor film was treated in a Na 2 CO 3 solution dissolved with Al to obtain the dawsonite film. The surface morphology of the conversion film was observed with an environmental scanning electronic microscope. The chemical composition of the conversion film was analyzed by energy dispersive X-ray spectroscopy and X-ray diffractometry. Electrochemical and immersion tests were carried out to evaluate the protection effect of the conversion film on AZ31 alloy. There are some network-like cracks on the surface of the film. The conversion film is mainly composed of dawsonite NaAlCO 3 (OH) 2 , Al(OH) 3 and Al 5 (OH) 13 (CO 3 )·5H 2 O, which can increase the corrosion potential and reduce the corrosion current density of the Mg substrate. After immersion tests, the film almost keeps intact, except for the localized narrow areas with several corrosion pits, while the bare material undergoes serious general corrosion. It is indicated that the dawsonite film can provide good protection to the magnesium alloy. 展开更多
关键词 magnesium alloy DAWSONITE conversion film CORROSION
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Phosphate film free of chromate, fluoride and nitrite on AZ31 magnesium alloy and its corrosion resistance 被引量:4
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作者 崔学军 刘春海 +3 位作者 杨瑞嵩 李明田 林修洲 龚敏 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第11期2713-2718,共6页
A phosphate solution free of chromate, fluoride and nitrite was prepared and an environment-friendly film was obtained on AZ31 magnesium alloy surface via the chemical deposition method. The morphology, composition, p... A phosphate solution free of chromate, fluoride and nitrite was prepared and an environment-friendly film was obtained on AZ31 magnesium alloy surface via the chemical deposition method. The morphology, composition, phase structure and its corrosion resistance were studied. The effects of film-forming temperature and free acid on corrosion resistance, microstructure and electrochemical behavior of the film were discussed. The results indicate that the corrosion resistance of AZ31 with the phosphate film was better than blank AZ31 substrate, which was most attributed to the great inhibitive action on the anodic dissolution and cathodic hydrogen evolution of the film. 展开更多
关键词 magnesium alloy AZ31 alloy phosphate conversion coating chromate-free film corrosion resistance anodicdissolution cathodic hydrogen evolution
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Influence of oxidation heat on hard anodic film of aluminum alloy 被引量:5
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作者 魏晓伟 陈朝英 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第11期2707-2712,共6页
The special experimental device and sulfuric acid electrolyte were adopted to study the influence of anodic oxidation heat on hard anodic film for 2024 aluminum alloy. Compared with the oxidation heat transferred to t... The special experimental device and sulfuric acid electrolyte were adopted to study the influence of anodic oxidation heat on hard anodic film for 2024 aluminum alloy. Compared with the oxidation heat transferred to the electrolyte through anodic film, the heat transferred to the coolant through aluminum substrate is more beneficial to the growth of anodic film. The film forming speed, film thickness, density and hardness are significantly increased as the degree of undercooling of the coolant increases. The degree of undercooling of the coolant, which is necessary for the growth of anodic film, is related to the degree of undercooling of the electrolyte, thickness of aluminum substrate, thickness of anodic film, natural parameters of bubble covering and current density. The microstructure and performance of the oxidation film could be controlled by the temperature of the coolant. 展开更多
关键词 aluminum alloy 2024 aluminum alloy oxidation heat sulfuric acid electrolyte hard anodic oxidation anodic film
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Electroless plating and growth kinetics of Ni-P alloy film on SiC_p/Al composite with high SiC volume fraction 被引量:4
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作者 方萌 胡玲 +3 位作者 杨磊 史常东 吴玉程 汤文明 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第3期799-805,共7页
After Sn/Pd activating, the SiCp/Al composite with 65% SiC (volume fraction) was coated by electroless Ni?P alloy plating. Surface morphology of the composite and its effect on the Ni?P alloy depositing process and bo... After Sn/Pd activating, the SiCp/Al composite with 65% SiC (volume fraction) was coated by electroless Ni?P alloy plating. Surface morphology of the composite and its effect on the Ni?P alloy depositing process and bonding action of Ni and P atoms in the Ni?P alloy were studied. The results show that inhomogeneous distribution of the Sn/Pd activating points results in preferential deposition of the Ni?P alloy particles on the Al alloy and rough SiC particle surfaces and in the etched caves. The Ni?P alloy film has an amorphous structure where chemical bonding between Ni and P atoms exists. After a continuous Ni?P alloy film formed, electroless Ni?P alloy plating is not affected by surface morphology and characteristics of the SiCp/Al composite any longer, but by the electroless plating process itself. The Ni?P alloy film follows linear growth kinetics with an activation energy of 68.44 kJ/mol. 展开更多
关键词 SiC_p/Al composite electroless plating Ni-P alloy film MICROSTRUCTURE growth kinetics
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Structure Analysis of Oxidation Film of Ignition-Inhibition AZ91D Magnesium Alloy Added with Cerium 被引量:12
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作者 黄晓锋 周宏 何镇明 《Journal of Rare Earths》 SCIE EI CAS CSCD 2003年第1期73-76,共4页
The effect of cerium on ignition temperature of AZ91D magnesium alloy was studie d. By the addition of cerium of 1%, the ignition temperature is raised by 180 ℃ , s o the magnesium alloy added with cerium can be melt... The effect of cerium on ignition temperature of AZ91D magnesium alloy was studie d. By the addition of cerium of 1%, the ignition temperature is raised by 180 ℃ , s o the magnesium alloy added with cerium can be melted in air. The burning temper ature increases with the increasing of cerium. The structure and chemical compos itions of the surface oxide film were investigated by XRD and Auger electron spe ctrometry(AES). The results of XRD indicate that the oxide film of the surface o f ignition-inhibition magnesium alloy can change from loose structure of simple magnesia to compact composite structure consisting of magnesia, cerium oxide, M g17 A112 and aluminum oxide, which has excellent ignition-inhibition effect. AE S depth profile analysis shows that the oxide film can be divided into three lay ers. The outside layer is mainly made up of magnesia, the middle layer, which co nsists of cerium oxide, magnesia, and aluminum oxide, is compound and compact. T hermodynamic analysis indicates that the structure of the surface oxide film is accordant to the change of free energy and high vapor pressure of magnesium. 展开更多
关键词 metal materials ignition-inhibition ceriu m oxide film magnesium alloy rare earths
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Preparation of Mg-Yb alloy film by electrolysis in the molten LiCl-KCl-YbCl_3 system at low temperature 被引量:10
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作者 陈野 叶克 张密林 《Journal of Rare Earths》 SCIE EI CAS CSCD 2010年第1期128-133,共6页
The electrochemical behavior of Yb3+ and electrodeposition of Mg-Yb alloy film at solid magnesium cathode in the molten LiCl-KCl-YbCl3(2 wt.%) system at 773 K was investigated.Transient electrochemical techniques,such... The electrochemical behavior of Yb3+ and electrodeposition of Mg-Yb alloy film at solid magnesium cathode in the molten LiCl-KCl-YbCl3(2 wt.%) system at 773 K was investigated.Transient electrochemical techniques,such as cyclic voltammetry,chronopotentiometry and chronoamperometry were used in order to explore the deposition mechanism of Yb.The reduction process of Yb3+ is stepwise reactions which are single-electron and double-electron reversible charge transfer reactions.The speed control step was a diffu... 展开更多
关键词 LiCl-KCl eutectic molten salt Mg-Yb alloy films ELECTROLYSIS low temperature rare earths
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Preparation and Performance of Rare Earths Chemical Conversion Film on Magnesium Alloy 被引量:9
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作者 于升学 吕巧艳 +2 位作者 韩婧 张占伟 张倩云 《Journal of Rare Earths》 SCIE EI CAS CSCD 2006年第z2期397-400,共4页
Golden yellow cerium conversion film was obtained on magnesium alloys surface by immersion method and the preparation parameters were established. The influence of different process parameters on the surface morpholog... Golden yellow cerium conversion film was obtained on magnesium alloys surface by immersion method and the preparation parameters were established. The influence of different process parameters on the surface morphology and performance of the conversion film were analyzed by means of SEM and electrochemical method. Formation dynamics about cerium conversion film on magnesium alloy in solution containing cerium salt and the anti-corrosion behavior of the conversion film in 3.5% NaCl solution were studied by electrochemical method respectively. The results shows that the conversion film is more compact at room temperature when concentration of cerium sulfate is 10 g·L-1 in the solution; the open circuit potential of the magnesium sample moves up to positive direction about 100 mV, the surface of conversion film becomes even and lustrous, and the adhesion intensity of conversion film increases when adding aluminum nitrate into the solution containing cerium salt. The pH value of the solution and immersion time of the sample in the solution also affect the surface morphology and anti-corrosion property of the conversion film. After covered by rare earths conversion film, the anti-corrosion property of magnesium alloy is obviously improved. Rare earth conversion film has self-repairing capability in corrosion medium. 展开更多
关键词 magnesium alloy chemical conversion film corrosion resistance rare earths
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Effects of acetic acid on microstructure and electrochemical properties of nano cerium oxide films coated on AA7020-T6 aluminum alloy 被引量:7
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作者 H. Hasannejad T. Shahrabi M. Aliofkhazraei 《Rare Metals》 SCIE EI CAS CSCD 2009年第1期98-101,共4页
Nano cerium oxide films were applied on AA7020-T6 aluminum alloy and the effects of acetic acid concentration on the microstructure and electrochemical properties of the coated samples were investigated by using scann... Nano cerium oxide films were applied on AA7020-T6 aluminum alloy and the effects of acetic acid concentration on the microstructure and electrochemical properties of the coated samples were investigated by using scanning electron microscopy (SEM), X-ray diffraction (XRD), and potentiodynamic polarization methods. It has been found that by increasing the acetic acid/CeCl3·7H2O molar ratio, high uniform and crack-free films with well-developed grains were obtained and grain sizes of the films decreased. Elimination of cracks and decreasing grain size of the nano cerium oxide films caused corrosion resistance to increase. 展开更多
关键词 nano cerium oxide films acetic acid aluminum alloy electrochemical property MICROSTRUCTURE
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Fabrication and characterization of anodic oxide films on a Ti-10V-2Fe-3Al titanium alloy 被引量:6
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作者 Jian-hua Liu Jun-lan Yi Song-mei Li Mei Yu Yong-zhen Xu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2009年第1期96-100,共5页
Anodic oxide films of the titanium alloy Ti-10V-2Fe-3Al in ammonium tartrate electrolyte without hydrofluoric acid or fluoride were fabricated. The morphology, components, and microstructure of the films were characte... Anodic oxide films of the titanium alloy Ti-10V-2Fe-3Al in ammonium tartrate electrolyte without hydrofluoric acid or fluoride were fabricated. The morphology, components, and microstructure of the films were characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and Raman spectroscopy. The results showed that the films were thick, uniform, and nontransparent. Such films exhibited sedimentary morphology, with a thickness of about 3 μm, and the pore diameters of the deposits ranged from several hundred nanometers to 1.5 μm. The films were mainly titanium dioxide. Some coke-like deposits, which may contain or be changed by OH, NH, C-C, C-O, and C=O groups, were doped in the films. The films were mainly amorphous with a small amount of anatase and rutile phase. 展开更多
关键词 titanium alloys anodic oxide films titanium dioxide pulse current method
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Investigation of a novel self-sealing pore micro-arc oxidation film on AM60 magnesium alloy 被引量:24
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作者 Yingwei Song Kaihui Dong +1 位作者 Dayong Shan En-Hou Han 《Journal of Magnesium and Alloys》 SCIE EI CAS 2013年第1期82-87,共6页
Micro-arc oxidation(MAO)is one of the promising methods to improve the corrosion resistance of magnesium alloys.However,there are plenty of micro-pores in the traditional MAO films,deteriorating their protection prope... Micro-arc oxidation(MAO)is one of the promising methods to improve the corrosion resistance of magnesium alloys.However,there are plenty of micro-pores in the traditional MAO films,deteriorating their protection property.A novel self-sealing pore MAO film was developed in this paper.The morphologies and chemical composition of the film were detected by scanning electron microscopy(SEM)and energy dispersive X-ray spectroscopy(EDX).The corrosion behavior was investigated by electrochemical and salt spray tests.The possible film formation and corrosion mechanisms were proposed.The self-sealing pore film presents a blue appearance.Most of the micro-pores in the surface of the film are sealed during the film formation process.The chemical composition of the film mainly contains Mg,O,Ti,F and P.The self-sealing pore film exhibits better corrosion resistance compared with the traditional silicate film.Especially,the self-sealing pore film keeps intact after salt spray test for 2000 h,which can be attributed to its high compactness. 展开更多
关键词 Self-sealing pore Micro-arc oxidation film Magnesium alloy Corrosion resistance
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Investigation of Formation and Inhibition Mechanism of Cerium Conversion Films on Al 2024 Alloy 被引量:4
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作者 邵敏华 黄若双 +1 位作者 付燕 林昌健 《Journal of Rare Earths》 SCIE EI CAS CSCD 2002年第6期640-645,共6页
To study the mechanism of formation and inhibition of Ce conversion films on Al 2024-T3 alloy, scanning microreference electrode technique (SMRE) is used to probe the potential map on Al 2024-T3 in CeCl 3 solution, t... To study the mechanism of formation and inhibition of Ce conversion films on Al 2024-T3 alloy, scanning microreference electrode technique (SMRE) is used to probe the potential map on Al 2024-T3 in CeCl 3 solution, the localized corrosion of Al alloy decreases with immersion time and disappears finally, which results from the competition of Cl - aggression and Ce 3+ inhibition on alloy surface. The results of X-ray photoelectron spectroscopy (XPS) indicate that the Ce conversion films consist of Al 2O 3, CeO 2 and Ce 2O 3(Ce(OH) 3), and CeO 2/Ce 2O 3 ratio decreases with the immersion time. When a critical pH for Ce(OH) 3 formation was reached, Ce(OH) 3 will precipitate on the micro cathodic area on alloy surface. Consequently, H 2O 2, the product of the catholic reaction will oxidize a part of Ce(OH) 3 to CeO 2, which appears a better corrosion resistance for Al alloys. 展开更多
关键词 rare earths Ce conversion film Al 2024 alloy SMRE corrosion resistance
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Preparation of Diamond-like Carbon Films on the Surface of Ti Alloy by Electro-deposition 被引量:3
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作者 Fenglei SHEN Hongwei WANG Dijiang WEN School of Materials Engineering,Suzhou University,Suzhou 215021,China 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2004年第3期367-368,共2页
In this paper, diamond-like carbon (DLC) films were deposited on Ti alloy by electro-deposition. DLC films were brown andcomposed of the compact grains whose diameter was about 400 nm. Examined by XPS, the main compos... In this paper, diamond-like carbon (DLC) films were deposited on Ti alloy by electro-deposition. DLC films were brown andcomposed of the compact grains whose diameter was about 400 nm. Examined by XPS, the main composition of the filmswas carbon. In the Raman spectrum, there were a broad peak at 1350 cm^(-1) and a broad peak at 1600 cm^(-1), which indicatedthat the films were DLC films. 展开更多
关键词 Diamond-like carbon film ELECTRO-DEPOSITION Ti alloy SURFACE
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