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Designing strategy for corrosion-resistant Mg alloys based on film-free and film-covered models

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Journal of Magnesium and Alloys 2023年第9期11卷 3120-3129页

作者： Pengyu Zhao Tao Ying fuyong cao Xiaoqin Zeng Wenjiang Ding National Engineering Research Center of Light Alloys Shanghai Jiao Tong UniversityShanghai 200240PR China Center for Marine Materials Corrosion and Protection College of MaterialsXiamen University361005PR China

Mathematical models were proposed to clarify the effect of alloying on corrosion of magnesium alloys based on film-free and film-covered status. The models are applicable to explain the “barrier effect” by cathodes and the “analogous Hall-Petch relationship” between corrosion rates and grain size. The slope of corrosion rates versus alloying content is determined by the dissolution ability of film-free substrate and the hindering effects by corrosion product film. Designing strategy for corrosion-resistant Mg alloys is established.

关键词： Magnesium Corrosion Modeling Electrochemistry

A Green Conversion Coating on a Magnesium Alloy for Corrosion Protection

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Acta Metallurgica Sinica(English Letters) 2023年第10期36卷 1630-1648页

作者： Tong Bu Ruijie Jia Tao Ying Andrej Atrens Pengbo Chen Dajiang Zheng fuyong cao Center for Marine Materials Corrosion and Protection College of MaterialsFujian Key Laboratory of Surface and Interface Engineering for High Performance MaterialsXiamen UniversityXiamen361005China National Engineering Research Center of Light Alloy Net Forming School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China School of Mechanical and Mining Engineering Centre for Advanced Materials Processing and Manufacturing(AMPAM)The University of QueenslandSt.LuciaBrisbaneQLD4072Australia First Affiliated Hospital of Xi’an Jiao Tong University Xi’an710061China

A novel coating on the Mg1Mn alloy was produced by anodic polarization combined with hydrothermal treatment(AP+H)in 0.1 M Na2CO3 *** microstructure and protection of the coating were *** coating consisted of MgCO3,Mg(OH)2 and MgO,and provided satisfactory protection in 3.5 wt%NaCl with a corrosion rate of 0.07 mm y−1 in 72 ***,after that period,the corrosion rate of the specimen increased due to the damage of the *** failure of the coating was strongly related to the second phase particles(*** particles)or impurities in the *** AP+H coating is supposed to be used as a primer coating for Mg applications in kitchen ware,biomedical areas or industry.

关键词： Coating Magnesium alloy Hydrothermal Corrosion resistance

Degradation Behavior of Zn-Cu Stents with Different Coatings in Sodium Chloride Solution

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Acta Metallurgica Sinica(English Letters) 2024年第9期37卷 1564-1580页

作者： Xingpeng Liao Jialuo Huang Zhilin Liu Jingru Guo Dajiang Zheng Pengbo Chen fuyong cao Center for Marine Materials Corrosion and Protection Fujian Key Laboratory of Surface and Interface Engineering for High Performance MaterialsCollege of MaterialsXiamen UniversityXiamen361005China Light Alloys Research Institute College of Mechanical and Electrical EngineeringCentral South UniversityChangsha410083China First Affiliated Hospital of Xi’an Jiao Tong University Xi’an710061China

The Zn0.6Cu wires are fabricated into stents for the potential biodegradable application of nasal wound *** degradation behavior of Zn0.6Cu stents in 0.9 wt%NaCl at 36.5℃ is *** shows that the untreated Zn0.6Cu stent experiences severe crevice corrosion with acceleration and autocatalytic effects within the micro-cracks and ruptures at 4.67±1.15 d,with the average corrosion rate of 0.28 mm y^(-1).Fortunately,the anodic polarization(AP)+hydrothermal(H)conversion coating,consisting of ZnCO_(3),Zn(OH)_(2) and ZnO,could inhibit the crevice corrosion significantly by reducing the cathode/anode ratio,extending the rupture time up to 16.50±2.95 d,with the average corrosion rate of 0.14 mm y^(-1).This research indicates that the biodegradable Zn-based stent has some potential applications in nasal wound recovery area.

关键词： Zn alloys wires Corrosion behavior Biodegradable stents Coating Degradation characterization

A Mg alloy with no hydrogen evolution during dissolution

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Journal of Magnesium and Alloys 2023年第6期11卷 2084-2095页

作者： fuyong cao Bo Xiao Ziming Wang Tao Ying Dajiang Zheng Andrej Atrens Guang-Ling Song Center for Marine Materials Corrosion and Protection College of MaterialsXiamen University422 S.Siming Rd.Xiamen 361005China State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen University422 S.Siming RdXiamen 361005China National Engineering Research Center of Light Alloy Net Forming School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China School of Mechanical and Mining Engineering The University of QueenslandSt LuciaBrisbaneQLD 4072Australia

Hydrogen evolution is normally associated with the corrosion or dissolution of Mg alloys in aqueous *** work studied the corrosion behavior of sputtered pure Mg,Mg82Zn18(at.%),Mg64Zn36(at.%),and pure Zn in 3.5%Na Cl ***64Zn36had(ⅰ)an amorphous microstructure with some nano-scale grains,(ⅱ)a corrosion rate substantially lower than that of pure Mg,and(ⅲ)no hydrogen evolution during corrosion or anodic dissolution,because the positive corrosion potential retarded the cathodic hydrogen *** is a new route to prevent hydrogen evolution during Mg corrosion,which has never previously been realized.

关键词： Magnesium hydrogen evolution metal glass anodic dissolution

Review of the atmospheric corrosion of magnesium alloys

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Journal of Materials Science & Technology 2019年第9期35卷 2003-2016页

作者： Hongguang Liu fuyong cao Guang-Ling Song Dajiang Zheng Zhiming Shi Mathew S.Dargusch Andrej Atrens Center for Marine Materials Corrosion and Protection College of MaterialsXiamen University422 Siming Rd.Xiamen 361005China State Key Laboratory of Physical Chemistry of Solid Surfaces Department of ChemistryCollege of Chemistry and Chemical Engineeringjdamen University 422 S. Siming Rd.XiamenFujian361005China Centre for Advanced Materials Processing and Manufacturing (AMPAM) School of Mechanical and Mining EngineeringThe University of Queensland BrisbaneQueensland 4072Australia

Mg atmospheric corrosion is induced by a thin surface aqueous layer. Controlling factors are microgalvanic acceleration between different phases, protection by a continuous second phase distribution, protection by corrosion products, and degradation of protective layers by aggressive species such as chloride ions. The Mg atmospheric corrosion rate increases with relative humidity (RH) and concentrations of aggressive species. Temperature increases the corrosion rate unless a protective film causes a decrease.O2, SO2 and NO2 accelerate the atmospheric corrosion rate, whereas the corrosion rate is decreased by CO2. The traditional gravimetric method can evaluate effectively the corrosion behavior of Mg alloys.

关键词： Magnesium Magnesium alloys Atmospheric corrosion

A state-of-the-art review on passivation and biofouling of Ti and its alloys in marine environments

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Journal of Materials Science & Technology 2018年第3期34卷 421-435页

作者： Shaokun Yan Guang-Ling Song Zhengxian Li Haonan Wang Dajiang Zheng fuyong cao Miroslava Horynova Matthew S.Dargusch Lian Z-hou Center for Marine Materials Corrosion&Protection State Key Laboratory of Physical Chemistry of Solid SurfacesCollege of MaterialsXiamen University422 S.Siming Rd.Xiamen 361005China Corrosion&Protection Research Lab Northwest Institute for Non-ferrous Metal ResearchXi'an 710016China Centre for Advanced Materials Processing and Manufacturing(AMPAM) School of Mechanical and Mining EngineeringThe University of QueenslandBrisbaneQld 4072Australia Nanjing Tech University Nanjing 211800China

High strength-to-weight ratio, commendable biocompatibility and excellent corrosion resistance make Ti alloys widely applicable in aerospace, medical and marine industries. However, these alloys suffer from serious biofouling, and may become vulnerable to corrosion attack under some extreme marine conditions. The passivating and biofouling performance of Ti alloys can be attributed to their compact, stable and protective films. This paper comprehensively reviews the passivating and biofouling behavior, as well as their mechanisms, for typical Ti alloys in various marine environments. This review aims to help extend applications of Ti alloys in extremely harsh marine conditions.

关键词： Ti alloy Passivity Biofouling

Advances in Mg corrosion and research suggestions

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Journal of Magnesium and Alloys 2013年第3期1卷 177-200页

作者： Andrej Atrens Guang-Ling Song fuyong cao Zhiming Shi Patrick K.Bowen The University of Queensland Materials EngineeringBrisbaneQld 4072 Australia bMichigan Technological University Department of Materials Science and EngineeringHoughtonMI49931USA Oak Ridge National Lab Corros Sci&TechnolOak RidgeTN 37831-6156USA

Recent research is summarised with an emphasis on the use of Mg alloys for biodegradable medical *** melt purification using Zr has been shown to provide the opportunity to produce ultra-high-purity Mg alloys,which could lead to stainless ***'s solution may be a good starting model for the study of Mg for biodegradable medical implant applications.A systematic laboratory investigation is needed to elucidate the details of how the corrosion behaviour is controlled by the various constituents of the body *** the evaluation of the Mg corrosion mechanism there is a critical lack of understanding of(i)the amount of hydrogen dissolved in the Mg metal during corrosion,and during anodic polarisation,and(ii)the size film-free area where corrosion occurs,and how to measure this *** the evaluation of the apparent valence of Mg using an applied anodic current density,for reliable values,it is important to apply a sufficiently large applied current *** available data are consistent with the slightly modified uni-positive Mg^(+)ion mechanism,which maintains that(i)the surface of Mg is covered by a partially protective film,and the film-free area increases as the potential becomes more positive(i.e.a catalytic activation process),(ii)corrosion occurs preferentially at breaks in the partial protective film,(iii)corrosion at the breaks in the partially protective film involves the uni-positive Mg ion,(iv)undermining of particles occurs when Mg is severely dissolved,and(v)there may be some self-corrosion not covered by these four processes,which may be associated with crevice-like features on a severely corroded surface or hydride dissolution at relatively negative ***-corrosion might also be possible under condition of essentially uniform ***^(+)has not been experimentally *** existence is postulated as an extremely-short lifetime intermediate in the reaction sequence between metallic Mg and the equilibrium ion Mg^(++).T

关键词： Magnesium Corrosion Stainless Mg Uni-positive Mg^(+) Biodegradation Self-corrosion

Stress corrosion cracking of high-strength AZ31 processed by high-ratio differential speed rolling

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Journal of Magnesium and Alloys 2015年第4期3卷 271-282页

作者： Zhiming Shi W.J.Kim fuyong cao Matthew S.Dargusch Andrej Atrens Materials Engineering School of Mechanical and Mining EngineeringThe University of QueenslandBrisbaneQld 4072Australia Centre for Advanced Materials Processing and Manufacturing(AMPAM) The University of QueenslandBrisbaneQld 4072Australia Department of Materials Science&Engineering Hongik University72-1 Mapo-guSangsu-dongSeoul 121-791Republic of Korea

Stress corrosion cracking(SCC)in distilled water was studied for AZ31,processed by differential-speed-rolling to different strengths,using Linear Increasing Stress Tests(LISTs).The stress corrosion crack velocity was 5.0±2.5×10^(−9) m s^(−1),independent of applied stress rate and independent of material *** susceptibility was greater at lower applied stress rates manifest most importantly as a lower threshold stress for stress corrosion crack *** susceptibility could be characterised by the ratio of threshold stress to yield stress,which was dependent on processing details and was as low as 0.3.

关键词： Magnesium LIST SEM Stress corrosion

基于ANSYS的气体绝缘全封闭组合开关隔震性能有限元分析

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世界地震工程 2016年第4期32卷 25-30页

作者：王社良李付勇杨涛曹文华西安建筑科技大学土木学院陕西西安710055 青岛市公用建筑设计研究院有限公司山东青岛266072

以现代输电系统中常见的气体绝缘全封闭组合开关为研究对象,利用ANSYS有限元分析软件对组合开关进行了建模和模态分析,并与振动台试验测得的自振频率进行了对比,验证了ANSYS建模的合理性。同时,对组合开关采用铅芯橡胶支座隔震前后的情... 详细信息

以现代输电系统中常见的气体绝缘全封闭组合开关为研究对象,利用ANSYS有限元分析软件对组合开关进行了建模和模态分析,并与振动台试验测得的自振频率进行了对比,验证了ANSYS建模的合理性。同时,对组合开关采用铅芯橡胶支座隔震前后的情况进行了非线性动力时程分析,分析结果表明:隔震后组合开关的自振周期明显延长,能够有效地避开地震的卓越周期,并且组合开关的峰值位移和最大绝对加速度较隔震前明显减小。证明组合开关采用铅芯橡胶支座进行隔震能够明显减小其地震响应,对研究高压电器设备的隔震技术具有一定的参考价值。

关键词：组合开关铅芯橡胶支座隔震 ANSYS 时程分析