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Improved high-temperature oxidation resistance of TC4 alloy by electrodeposited SiO2 coating

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Corrosion Communications 2021年第3期3卷 34-44页

作者： Hao-Jie Yan Zhong-Fu Tai lian-kui wu Fa-He Cao School of Materials Shenzhen Campus of Sun Yat-sen University

Thickness controllable SiO2coating was fabricated on TC4 alloy by electrodeposition. The oxidation behavior of TC4 alloy with SiO2coating was studied at 700 °C. The effect of electrodeposition time on the coating thickness, morphology, and oxidation performance was studied. Results showed that with the increase of electrodeposition time, the thickness of the SiO2coating almost linearly increased, while the oxidation resistance improved firstly and then decreased. During high-temperature oxidation, the SiO2coating could react with the substrate and strengthen the interfacial structure. To further enhance the oxidation performance, before thermal exposure to air, the SiO2coating protected TC4 alloy was sintered in argon. This resulted in the generation of a compact and glass-like oxide scale which could effectively prevent the inward diffusion of oxygen and the outward diffusion of titanium, therefore significantly enhancing the oxidation performance of TC4 alloy.

关键词： TC4 alloy SiO 2 coating High-temperature oxidation

Effects of TiC particles on tribological and corrosion resistance of PEO coating on TC4 alloy

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Corrosion Communications

Corrosion Communications 2024年第2期14卷 1-10页

作者： Yan Tang Cui-Ping Yang Qing-Qing Sun lian-kui wu Fa-He Cao School of Materials Sun Yat-sen University

To improve wear resistance and corrosion behavior of TC4 alloy,plasma electrolytic oxidation （PEO） was performed in a TiC particle containing *** show that increasing PEO current density is conducive to improving the coating thickness,promoting incorporation of TiC particles,and enhancing wear resistance of the *** increasing TiC content in electrolyte reduces PEO coating *** the optimized condition,where the electrolyte has 2 g L-1TiC and PEO current density is 5 A dm-2,the derived PEO coating exhibits both high wear resistance and corrosion ***,it is shown that the incorporated TiC particles are more likely to become components in the inner layer of the derived MAO coating.

关键词： TC4 alloy Plasma electrolytic oxidation Corrosion resistance Wear resistance

Oxidation and tribological properties of anodized Ti45Al8.5Nb alloy

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Transactions of Nonferrous Metals Society of China 2021年第11期31卷 3439-3451页

作者： Zhe-xuan LI Ya-ting BAO lian-kui wu Fa-he CAO School of Materials Shenzhen Campus of Sun Yat-sen UniversityShenzhen 518107China College of Materials Science and Engineering Zhejiang University of TechnologyHangzhou 310014China

The oxidation performance and tribological properties of the anodized Ti45Al8.5Nb were *** was performed in ethylene glycol containing 0.15 mol/L NH_(4)*** showed that the anodized Ti45Al8.5Nb alloy exhibited good resistance against *** 100 h oxidation at 1000℃,the mass gain of the anodized Ti45Al8.5Nb alloy was only 0.37 mg/cm^(2).This is attributed to the generation of protective oxide *** the other hand,the hardness and elastic modulus of the anodized Ti45Al8.5Nb alloy decreased and then increased with the prolonging of thermal exposure due to the generation of the Al_(2)O_(3)-enriched outermost oxide layer.

关键词： titanium aluminum alloy anodization high temperature oxidation tribological properties

Nucleation/growth mechanism of electrocrystallization for As-Sb alloy in hydrochloric acid system

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Transactions of Nonferrous Metals Society of China 2017年第10期27卷 2291-2299页

作者： Hua-zhen CAO Yu-feng ZHANG Qian-qian WANG lian-kui wu Guo-qu ZHENG College of Materials Science and Engineering Zhejiang University of Technology Hangzhou 310014 China

The initial electrocrystallization of As-Sb alloy on glass carbon(GC)electrode in hydrochloric acid system was studiedvia cyclic voltammetry(CV)and chronoamperometry *** transients were presented in dimensionless formation,which showed that the initial nucleation/growth process of As-Sb alloy followed three-dimensional nucleation model with *** nucleation parameters were calculated by analyzing related current *** attention waspaid to the effect of Sb(III)concentration on the nucleation process during the *** quantitative results showedthat Sb(III)played a positive effect on enhancing the nucleation rate of As-Sb alloy,leading to the evolution of alloy surfacemorphology from grain structure to compact layer structure.

关键词： arsenic antimony As-Sb alloy electrodeposition nucleation

Improving hot corrosion resistance of aluminized TiAl alloy by anodization and pre-oxidation

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Transactions of Nonferrous Metals Society of China 2021年第1期31卷 193-206页

作者： Yuan-tao HU Lei ZHENG Hao-jie YAN lian-kui wu Xiang-jun LIN Fa-he CAO Mei-yan JIANG School of Materials Science and Engineering Sun Yat-sen UniversityGuangzhou 510275China College of Materials Science and Engineering Zhejiang University of TechnologyHangzhou 310014China Institute of Defense Engineering AMSPLABeijing 100850China

To shield TiAl alloy from hot corrosion attack,a compact protective coating was fabricated by the combination of aluminizing,anodization and *** hot corrosion behavior of the coated-TiAl specimen was investigated in the mixture salt consisting of 75 wt.%Na2SO4 and 25 wt.%NaCl at 700°*** indicated that the anodization and pre-oxidation were beneficial to the generation of Al2O3 layer,which could act as a diffusion barrier to prevent the molten salts and oxygen from diffusing into the alloy during exposure to a hot corrosion environment while the aluminizing coating could provide sufficient aluminum source to support the continuous formation of Al2O3 ***,the internal stress of the coating was reduced due to the formation of a gradient coating consisting of TiAl3 and TiAl2.

关键词： hot corrosion TiAl alloy pack cementation anodization halogen effect

Enhancement of motor functional recovery in thoracic spinal cord injury: voluntary wheel running versus forced treadmill exercise

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Neural Regeneration Research 2025年第3期20卷 836-844页

作者： Do-Hun Lee Dan Cao Younghye Moon Chen Chen Nai-kui Liu Xiao-Ming Xu Wei wu Spinal Cord and Brain Injury Research Group Stark Neurosciences Research InstituteIndiana University School of MedicineIndianapolisINUSA Department of Neurological Surgery Indiana University School of MedicineIndianapolisINUSA Department of Neuroscience Baylor College of MedicineHoustonTXUSA

Spinal cord injury necessitates effective rehabilitation strategies, with exercise therapies showing promise in promoting recovery. This study investigated the impact of rehabilitation exercise on functional recovery and morphological changes following thoracic contusive spinal cord injury. After a 7-day recovery period after spinal cord injury, mice were assigned to either a trained group(10 weeks of voluntary running wheel or forced treadmill exercise) or an untrained group. Bi-weekly assessments revealed that the exercise-trained group, particularly the voluntary wheel exercise subgroup, displayed significantly improved locomotor recovery, more plasticity of dopaminergic and serotonin modulation compared with the untrained group. Additionally, exercise interventions led to gait pattern restoration and enhanced transcranial magnetic motor-evoked potentials. Despite consistent injury areas across groups, exercise training promoted terminal innervation of descending axons. In summary, voluntary wheel exercise shows promise for enhancing outcomes after thoracic contusive spinal cord injury, emphasizing the role of exercise modality in promoting recovery and morphological changes in spinal cord injuries. Our findings will influence future strategies for rehabilitation exercises, restoring functional movement after spinal cord injury.

关键词： behavioral assessment motor function neural plasticity running wheel exercise spinal cord injury treadmill exercise voluntary exercise

Electrodeposition of As-Sb alloy from high arsenic-containing solutions

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Transactions of Nonferrous Metals Society of China 2016年第1期26卷 310-318页

作者：曹华珍钟杨伍廉奎张煜峰郑国渠浙江工业大学材料科学与工程学院杭州310014

As-Sb alloy was electrodeposited from high arsenic-containing solutions. The influences of current density, Sb（3＋） concentration, reaction temperature and HCl concentration on the electrolyte composition, cell voltage and current efficiency were investigated. The surface morphology, composition and structure of the deposits were analyzed by scanning electron microscopy（SEM）, inductively coupled plasma mass spectrometry（ICP-MS） and X-ray diffraction（XRD）, respectively. The results show that the prepared As-Sb alloy shows an amorphous structure under all conditions. Under the optimized condition, i.e., 10 g/L As（3＋）, 2 g/L Sb（3＋）, 4 mol/L HCl, current density of 4 mA/cm2 and temperature of 20 °C, desired As-Sb alloy with a composition of 70.26% As and 29.74% Sb（mass fraction） is obtained. What is more, the current efficiency is as high as 94.74% and high arsenic removal rate is achieved under this condition.

关键词： arsenic-containing solution hydrochloric system electrodeposition As-Sb alloy

Chondroitinase ABC combined with Schwann cell transplantation enhances restoration of neural connection and functional recovery following acute and chronic spinal cord injury

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Neural Regeneration Research 2025年第5期20卷 1467-1482页

作者： Wenrui Qu Xiangbing wu Wei wu Ying Wang Yan Sun Lingxiao Deng Melissa Walker Chen Chen Heqiao Dai Qi Han Ying Ding Yongzhi Xia George Smith Rui Li Nai-kui Liu Xiao-Ming Xu Spinal Cord and Brain Injury Research Group Stark Neurosciences Research InstituteDepartment of Neurological SurgeryIndiana University School of MedicineIndianapolisINUSA Department of Hand Surgery the Second Hospital of Jilin UniversityChangchunJilin ProvinceChina Shriners Hospitals Pediatric Research Center Temple University School of MedicinePhiladelphiaPAUSA Department of Anatomy&Cell Biology Indiana University School of MedicineIndianapolisINUSA

Schwann cell transplantation is considered one of the most promising cell-based therapy to repair injured spinal cord due to its unique growth-promoting and myelin-forming properties.A the Food and Drug Administration-approved Phase I clinical trial has been conducted to evaluate the safety of transplanted human autologous Schwann cells to treat patients with spinal cord injury.A major challenge for Schwann cell transplantation is that grafted Schwann cells are confined within the lesion cavity,and they do not migrate into the host environment due to the inhibitory barrier formed by injury-induced glial scar,thus limiting axonal reentry into the host spinal *** we introduce a combinatorial strategy by suppressing the inhibitory extracellular environment with injection of lentivirus-mediated transfection of chondroitinase ABC gene at the rostral and caudal borders of the lesion site and simultaneously leveraging the repair capacity of transplanted Schwann cells in adult rats following a mid-thoracic contusive spinal cord *** report that when the glial scar was degraded by chondroitinase ABC at the rostral and caudal lesion borders,Schwann cells migrated for considerable distances in both rostral and caudal *** Schwann cell migration led to enhanced axonal regrowth,including the serotonergic and dopaminergic axons originating from supraspinal regions,and promoted recovery of locomotor and urinary bladder ***,the Schwann cell survival and axonal regrowth persisted up to 6 months after the injury,even when treatment was delayed for 3 months to mimic chronic spinal cord *** findings collectively show promising evidence for a combinatorial strategy with chondroitinase ABC and Schwann cells in promoting remodeling and recovery of function following spinal cord injury.

关键词： axonal regrowth bladder function chondroitinase ABC functional recovery glial scar lentivirus migration Schwann cell spinal cord injury transplantation

电解液成分对等离子体电解氧化TC4合金腐蚀行为和摩擦学性能的影响

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Transactions of Nonferrous Metals Society of China 2023年第1期33卷 141-156页

作者：杨翠萍孟宪泽李鑫冉李哲轩严豪杰伍廉奎曹发和中山大学材料学院深圳518107 南方海洋科学与工程广东省实验室(珠海) 珠海519082

在TC4合金表面制备4种典型等离子体电解氧化(PEO)涂层,研究电解质组成对PEO涂层腐蚀行为和摩擦学性能的影响。结果表明,PEO涂层的腐蚀行为和摩擦学性能与电解质成分密切相关。在含NaH_(2)PO_(2)的电解液中制备的PEO涂层由于内氧化膜较... 详细信息

在TC4合金表面制备4种典型等离子体电解氧化(PEO)涂层,研究电解质组成对PEO涂层腐蚀行为和摩擦学性能的影响。结果表明,PEO涂层的腐蚀行为和摩擦学性能与电解质成分密切相关。在含NaH_(2)PO_(2)的电解液中制备的PEO涂层由于内氧化膜较致密而具有最好的耐蚀性能,而在含NaAlO_(2)的电解液中制备的PEO涂层由于含有Al_(2)O_(3)而具有最好的摩擦学性能。为制备具有良好耐蚀性和耐磨性的PEO涂层,以NaH_(2)PO_(2)和NaAlO_(2)为电解液主要成分制备了复合PEO涂层。

关键词： Ti6Al4V合金等离子体电解氧化极化曲线磨损