Nano-zinc oxides(ZnO)demonstrate remarkable antibacterial properties.To further enhance the corrosion resistance and antibacterial efficiency of magnesium alloy micro-arc oxidation(MAO)coatings,this study investigates...Nano-zinc oxides(ZnO)demonstrate remarkable antibacterial properties.To further enhance the corrosion resistance and antibacterial efficiency of magnesium alloy micro-arc oxidation(MAO)coatings,this study investigates the preparation of ZnO-containing micro-arc oxidation coatings with dual functionality by incorporating nano-ZnO into MAO electrolyte.The influence of varying ZnO concentrations on the microstructure,corrosion resistance,and antibacterial properties of the coating was examined through microstructure analysis,immersion tests,electrochemical experiments,and antibacterial assays.The findings revealed that the addition of nano-ZnO significantly enhanced the corrosion resistance of the MAO-coated alloy.Specifically,when the ZnO concentration in the electrolyte was 5 g/L,the corrosion rate was more than ten times lower compared to the MAO coatings without ZnO.Moreover,the antibacterial efficacy of ZnO+MAO coating,prepared with a ZnO concentration of 5 g/L,surpassed 95%after 24 h of co-culturing with Staphylococcus aureus(S.aureus).The nano-ZnO+MAO-coated alloy exhibited exceptional degradation resistance,corrosion resistance,and antibacterial effectiveness.展开更多
The limited corrosion resistance of Mg-Li alloys restricts their applications.This study investigates the en-hancement of corrosion resistance in LAZ931 alloy through the application of a composite MAO/NaMgF_(3) coati...The limited corrosion resistance of Mg-Li alloys restricts their applications.This study investigates the en-hancement of corrosion resistance in LAZ931 alloy through the application of a composite MAO/NaMgF_(3) coating via a two-step process,encompassing MAO pretreatment followed by caffeic acid-induced NaMgF_(3) chemical deposition.The enhanced corrosion resistance is attributed to the homogenization of the MAO coating and the in-situ sealing of pores by NaMgF_(3) on the Mg surface.The incorporation of caffeic acid facilitates the formation of NaMgF_(3).Furthermore,it is observed that samples treated with this composite coating demonstrate robust ultraviolet light absorption capabilities and can emit visible light when excited by near-ultraviolet light.This unique characteristic expands the potential applications of this coating technology in the aerospace industry.This research offers novel perspectives on the design and preparation of composite coatings for magnesium alloys,holding great promise for broadening the application scope of Mg-Li alloys.展开更多
Micro-arc oxidation(MAO)flm can only provide common mechanical protection for magnesium(Mg)–lithium(Li)alloys.These alloys are susceptible to severe localized corrosion,if the MAO flm is disrupted.This work reports t...Micro-arc oxidation(MAO)flm can only provide common mechanical protection for magnesium(Mg)–lithium(Li)alloys.These alloys are susceptible to severe localized corrosion,if the MAO flm is disrupted.This work reports the successful hydrothermal preparation of a MgLiAlCe-LDHs@GO flm on a MAO-coated Mg–Li alloy following Ce confnement.The graphene oxide(GO)sheet increased the difusion path of the corrosive media,and the addition of rare-earth cerium ions(Ce^(3+))endowed the flm with a certain self-healing ability,which signifcantly improved the corrosion resistance of the flm,and the corrosion current density(icorr)reached 3.27×10^(−8)A cm^(−2).The synergistic action of GO and Ce^(3+)can achieve long-term corrosion protection for the substrate.The corrosion resistance mechanism of MgLiAlCe-LDHs@GO flm was discussed by the scanning vibration electrode technique(SVET).展开更多
The widespread application of magnesium(Mg)and Mg alloys is limited by their poor corrosion resistance.Micro-arc oxidation(MAO)is a common surface treatment,but the inherent defects of the MAO coating require post-tre...The widespread application of magnesium(Mg)and Mg alloys is limited by their poor corrosion resistance.Micro-arc oxidation(MAO)is a common surface treatment,but the inherent defects of the MAO coating require post-treatment to ensure good corrosion protection.Therefore,various zeolitic imidazolate framework ZIF-67@Co-M(M=Fe,Al,Ni)layered double hydroxides(LDHs)composite coatings were fabricated on MAO-treated AZ31 Mg alloy to enhance its corrosion resistance.The surface characteristics,coating thickness,corrosion resistance and protection mechanisms of the ZCM(ZIF-67@Co-M LDHs)composite coatings were examined.The findings indicate that the ZCF(ZIF-67@Co-Fe LDHs)composite coating exhibits the lowest corrosion current density(i_(corr)=7.76×10^(-8)A/cm^(2)),superior corrosion resistance,the lowest corrosion rate(HEV=2.46 mL·cm^(-2))and the fastest response speed to corrosion.The synergistic integration of ZIF-67 and LDHs effectively prevents the invasion of corrosive media,enhancing both short-term and long-term corrosion resistance of AZ31 alloys.These composite coatings surpass the limitations of individual materials,providing a promising strategy for durable corrosion protection.展开更多
As an important branch of traditional medicine,Zhuang Medicine is renowned for its unique prescriptions and techniques in clinical treatment,with significant therapeutic effects and widespread popularity.This article ...As an important branch of traditional medicine,Zhuang Medicine is renowned for its unique prescriptions and techniques in clinical treatment,with significant therapeutic effects and widespread popularity.This article introduces Professor Fang Gang’s experience in treating obesity-type polycystic ovary syndrome(PCOS)with modified Zhuang Medicine Mao Xia Yin.Professor Fang Gang proposes that the etiology and pathogenesis of obesity-type polycystic ovary syndrome(PCOS)primarily stem from spleen deficiency,which impairs the transport of water and dampness.This dysfunction leads to the accumulation of dampness that transforms into phlegm.Over time,the stagnation of phlegm and dampness generates internal heat,resulting in the formation of“dampness toxin,”“phlegm toxin,”and“heat toxin.”These pathological toxins obstruct the circulation of Qi and blood,causing stasis and the emergence of“stasis toxin.”The buildup of these toxins ultimately blocks the three channels and two pathways,disrupting the harmony among the three Qi of heaven,earth,and man.This disharmony culminates in impaired uterine gland function.Therefore,the treatment mainly focuses on tonifying deficiency,detoxifying,and regulating Qi.展开更多
Micro-arc oxidation （MAO） process was carried out on AZ91D alloy in alkaline borate solution using an alternative square-wave power source with different parameters. The effects of voltage, frequency and duty cycle ...Micro-arc oxidation （MAO） process was carried out on AZ91D alloy in alkaline borate solution using an alternative square-wave power source with different parameters. The effects of voltage, frequency and duty cycle on the coatings were investigated by orthogonal experiment. It is found that the thickness of coatings increases with the increase of voltage and duty cycle, but decreases with the increase of frequency. The structure and morphology of the coatings also depend on voltage, frequency and duty cycle. The coatings become more porous and crack with increasing voltage and duty cycle. The coating is thin and transparent when the voltage is lower than 120 V. The corrosion resistances of different coatings were evaluated by polarization curves and electrochemical impedance spectroscopy （EIS） in 3.5% NaCl （mass fraction） solution. When the optimized values of voltage, frequency and duty cycle are 140 V, 2 000 Hz and 0.4, respectively, the anodic coating shows the best corrosion resistance.展开更多
基金supported by the National Natural Science Foundation of China(No.52001034)the China Postdoctoral Science Foundation(No.2023M731677)the Postgraduate Research&Practice Innovation Program of Jiangsu Province(No.KYCX23_3032).
文摘Nano-zinc oxides(ZnO)demonstrate remarkable antibacterial properties.To further enhance the corrosion resistance and antibacterial efficiency of magnesium alloy micro-arc oxidation(MAO)coatings,this study investigates the preparation of ZnO-containing micro-arc oxidation coatings with dual functionality by incorporating nano-ZnO into MAO electrolyte.The influence of varying ZnO concentrations on the microstructure,corrosion resistance,and antibacterial properties of the coating was examined through microstructure analysis,immersion tests,electrochemical experiments,and antibacterial assays.The findings revealed that the addition of nano-ZnO significantly enhanced the corrosion resistance of the MAO-coated alloy.Specifically,when the ZnO concentration in the electrolyte was 5 g/L,the corrosion rate was more than ten times lower compared to the MAO coatings without ZnO.Moreover,the antibacterial efficacy of ZnO+MAO coating,prepared with a ZnO concentration of 5 g/L,surpassed 95%after 24 h of co-culturing with Staphylococcus aureus(S.aureus).The nano-ZnO+MAO-coated alloy exhibited exceptional degradation resistance,corrosion resistance,and antibacterial effectiveness.
基金financial support from the Joint Fund Project of Henan Provincial Science and Technology Research and Development Plan(No.242301420036)the National Natural Sci-ence Foundation of China(No.52301107)+1 种基金the Domain Foun-dation of Equipment Advance Research of the 14th Five-year Plan(No.50922010302)supported by the Project of Zhongyuan Critical Metals Laboratory.
文摘The limited corrosion resistance of Mg-Li alloys restricts their applications.This study investigates the en-hancement of corrosion resistance in LAZ931 alloy through the application of a composite MAO/NaMgF_(3) coating via a two-step process,encompassing MAO pretreatment followed by caffeic acid-induced NaMgF_(3) chemical deposition.The enhanced corrosion resistance is attributed to the homogenization of the MAO coating and the in-situ sealing of pores by NaMgF_(3) on the Mg surface.The incorporation of caffeic acid facilitates the formation of NaMgF_(3).Furthermore,it is observed that samples treated with this composite coating demonstrate robust ultraviolet light absorption capabilities and can emit visible light when excited by near-ultraviolet light.This unique characteristic expands the potential applications of this coating technology in the aerospace industry.This research offers novel perspectives on the design and preparation of composite coatings for magnesium alloys,holding great promise for broadening the application scope of Mg-Li alloys.
基金supported by the National Key R&D Program of China(2021YFB3701100)the National Natural Science Foundation of China(52171101)the Fundamental Research Funds for the Central Universities(2024IAIS-QN009).
文摘Micro-arc oxidation(MAO)flm can only provide common mechanical protection for magnesium(Mg)–lithium(Li)alloys.These alloys are susceptible to severe localized corrosion,if the MAO flm is disrupted.This work reports the successful hydrothermal preparation of a MgLiAlCe-LDHs@GO flm on a MAO-coated Mg–Li alloy following Ce confnement.The graphene oxide(GO)sheet increased the difusion path of the corrosive media,and the addition of rare-earth cerium ions(Ce^(3+))endowed the flm with a certain self-healing ability,which signifcantly improved the corrosion resistance of the flm,and the corrosion current density(icorr)reached 3.27×10^(−8)A cm^(−2).The synergistic action of GO and Ce^(3+)can achieve long-term corrosion protection for the substrate.The corrosion resistance mechanism of MgLiAlCe-LDHs@GO flm was discussed by the scanning vibration electrode technique(SVET).
基金supported by the National Natural Science Foundation of China(No.52171101)the Fundamental Research Funds for the Central Universities(No.2024IAIS-QN009)the National Key R&D Program of China(No.2021YFB3701100).
文摘The widespread application of magnesium(Mg)and Mg alloys is limited by their poor corrosion resistance.Micro-arc oxidation(MAO)is a common surface treatment,but the inherent defects of the MAO coating require post-treatment to ensure good corrosion protection.Therefore,various zeolitic imidazolate framework ZIF-67@Co-M(M=Fe,Al,Ni)layered double hydroxides(LDHs)composite coatings were fabricated on MAO-treated AZ31 Mg alloy to enhance its corrosion resistance.The surface characteristics,coating thickness,corrosion resistance and protection mechanisms of the ZCM(ZIF-67@Co-M LDHs)composite coatings were examined.The findings indicate that the ZCF(ZIF-67@Co-Fe LDHs)composite coating exhibits the lowest corrosion current density(i_(corr)=7.76×10^(-8)A/cm^(2)),superior corrosion resistance,the lowest corrosion rate(HEV=2.46 mL·cm^(-2))and the fastest response speed to corrosion.The synergistic integration of ZIF-67 and LDHs effectively prevents the invasion of corrosive media,enhancing both short-term and long-term corrosion resistance of AZ31 alloys.These composite coatings surpass the limitations of individual materials,providing a promising strategy for durable corrosion protection.
基金National Administration of Traditional Chinese Medicine high-level key discipline construction project on Ethnic Minority Medicine(Zhuang Medicine)(Project No.:zyyzdxk-2023164)Guangxi Higher Education Key Laboratory for Research on Toxin-related Diseases in Zhuang Medicine(Guijiao Keyan[2022]No.10).
文摘As an important branch of traditional medicine,Zhuang Medicine is renowned for its unique prescriptions and techniques in clinical treatment,with significant therapeutic effects and widespread popularity.This article introduces Professor Fang Gang’s experience in treating obesity-type polycystic ovary syndrome(PCOS)with modified Zhuang Medicine Mao Xia Yin.Professor Fang Gang proposes that the etiology and pathogenesis of obesity-type polycystic ovary syndrome(PCOS)primarily stem from spleen deficiency,which impairs the transport of water and dampness.This dysfunction leads to the accumulation of dampness that transforms into phlegm.Over time,the stagnation of phlegm and dampness generates internal heat,resulting in the formation of“dampness toxin,”“phlegm toxin,”and“heat toxin.”These pathological toxins obstruct the circulation of Qi and blood,causing stasis and the emergence of“stasis toxin.”The buildup of these toxins ultimately blocks the three channels and two pathways,disrupting the harmony among the three Qi of heaven,earth,and man.This disharmony culminates in impaired uterine gland function.Therefore,the treatment mainly focuses on tonifying deficiency,detoxifying,and regulating Qi.
基金Project (50801056) supported by the National Natural Science Foundation of ChinaProject (2005DKA10400-Z20) supported by the National R&D Infrastructure and Facility Development Program of ChinaProject supported by the Zijin Project of Zhejiang University, China
文摘Micro-arc oxidation （MAO） process was carried out on AZ91D alloy in alkaline borate solution using an alternative square-wave power source with different parameters. The effects of voltage, frequency and duty cycle on the coatings were investigated by orthogonal experiment. It is found that the thickness of coatings increases with the increase of voltage and duty cycle, but decreases with the increase of frequency. The structure and morphology of the coatings also depend on voltage, frequency and duty cycle. The coatings become more porous and crack with increasing voltage and duty cycle. The coating is thin and transparent when the voltage is lower than 120 V. The corrosion resistances of different coatings were evaluated by polarization curves and electrochemical impedance spectroscopy （EIS） in 3.5% NaCl （mass fraction） solution. When the optimized values of voltage, frequency and duty cycle are 140 V, 2 000 Hz and 0.4, respectively, the anodic coating shows the best corrosion resistance.
