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Hierarchical microstructure and two-stage corrosion behavior of a high-performance near-eutectic zn-Li alloy

Journal of Materials Science & Technology 2021年第21期80卷 50-65页

作者： Zhen Li Zhang-Zhi Shi Hai-Jun Zhang Hua-Fang Li Yun Feng Lu-Ning Wang Beijing Advanced Innovation Center for Materials Genome Engineering School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing100083China Beijing Laboratory of Metallic Materials and Processing for Modern Transportation University of Science and Technology BeijingBeijing100083China Department of Interventional and Vascular Surgery The Tenth People's Hospital of ShanghaiTongji UniversityShanghai200072China National United Engineering Laboratory for Biomedical Material Modification Branden Industrial ParkQihe Economic&Development ZoneDezhou CityShandongDezhou251100China Ophthalmology Department Peking University Third HospitalPeking UniversityBeijing100083China

In order to improve mechanical and corrosion properties of biodegradable pure zn,a knowledge-based microstructure design is performed on zn-Li alloy system composed of hard β-Lizn_(4) and soft zn phases.Precipitation and multi-modal grain structure are designed to toughen β-Lizn_(4) while strengthen zn,resulting in high strength and high ductility for both the phases.Needle-like secondary zn precipitates form in β-Lizn4,while fine-scale networks of string-like β-Lizn4 precipitates form in zn with a tri-modal grain structure.As a result,near-eutectic zn-0.48 Li alloy with an outstanding combination of high strength and high ductility has been fabricated through hot-warm rolling,a novel fabrication process to realize the microstructure design.The as-rolled alloy has yield strength(YS) of 246 MPa,the ultimate tensile strength(UTS) of 395 MPa and elongation to failure(EL) of 47 %.Immersion test in simulated body fluid(SBF) for 30 days reveals that Li-rich products form preferentially at initial stage,followed by zn-rich products with prolonged time.Aqueous insoluble Li_(2) CO_(3) forms a protective passivation film on the alloy surface,which suppresses the average corrosion rate from 81.2 μm/year at day one down dramatically to 18.2 μm/year at day five.Afterwards,the average corrosion rate increases slightly with decrease of Li2 CO_(3) content,which undulates around the clinical requirements on corrosion resistance(i.e.,20 μm/year) claimed for biodegradable metal stents.

关键词： zn alloy Microstructure design Mechanical properties Interfacial structure Corrosion passivation

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Static and Dynamic Precipitation Behavior of the Al-20wt.% zn alloy

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Chinese Physics Letters 2016年第5期33卷 63-66页

作者：刘崇宇江鸿杰王春霞亓海全李义兵马明臻刘日平 Key Laboratory of New Processing Technology for Nonferrous Metal & Materials(Ministry of Education) Guilin University of Technology State Key Laboratory of Metastable Materials Science and Technology Yanshan University Guangxi Key Laboratory of Universities for Clean Metallurgy and Comprehensive Utilization of Nonferrous Metal Resources

The static and dynamic precipitation behavior of solution-treated binary Al-20 wt.% zn alloy is investigated via artificial aging, cold rolling and artificial aging combined with cold rolling. The solution-treated Al-zn alloy exhibits high thermal stability during aging, and low densities of nano-sized zn particles are precipitated along with AI grain boundaries after aging at 200℃ for 13 h. Compared with static precipitation, dynamic precipitation occurs more easily in the Al-zn alloy. zn clusters are obtained after cold rolling at an equivalent plastic strain of 0.6, and the size of the zn phase reaches hundreds of nanometers when the strain is increased to 12.1. The results show that the speed of static precipitation can be significantly enhanced after the application of 2.9 rolling strain. Grain refinement and defects induced by cold rolling are considered to promote zn precipitation. The hardness of Al-zn alloy is also affected by static and dynamic precipitations.

关键词： zn alloy in on as Al Static and Dynamic Precipitation Behavior of the Al-20wt of

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Electrochemical Behavior and Corrosion Study of Electrodeposits of zn and zn-Fe-Co on Steel

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Materials Sciences and Applications 2012年第6期3卷 348-354页

作者： Conceicao A.M.Dutra Eduardo N.Codaro Roberto Z.Nakazato Departamento de Física e Química Universidade Estadual PaulistaCampus de GuaratinguetáGuaratinguetáBrazil.

From industrialized baths, free of cyanide, the corrosion behavior of electrodeposits of zinc and zinc alloys was studied by means of electrochemical tests in aerated solution of 3.5% (0.6 M) NaCl at pH 8.2. In literature, several studies are found about zinc coatings and zinc alloys, for example, zn-Ni and zn-Co, nevertheless there is little about the ternary alloy zn-Fe-Co. The Fe presence in the alloy results in a good adhesion to the substrate and allows application of these materials at higher temperatures. The electrochemical tests were carried out by obtaining open circuit potential curves with immersion time, potentiodynamic polarization curves and cyclic voltammetry. From the obtained results, the large potential differences observed between the steel and the electrodeposits showed that the last protect the substrate, acting as a sacrifice metal. The tests disclosed similar behaviors in both the current densities and the corrosion potential for electrodeposits of zn and zn-Fe-Co. After chromate passivation process, a significant decrease in corrosion density was noted for zn and when the system was de-aerated there was change in the cathodic process mechanism.

关键词： Corrosion Electrodeposition zn zn alloy

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Corrosion Resistance of zn and zn-Ni Electrodeposits:Morphological Characterization and Phases Identification

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Materials Sciences and Applications 2013年第10期4卷 644-648页

作者： Conceicao A.M.Dutra José W.J.Silva Roberto Z.Nakazato Departamento de Física e Química Campus de GuaratinguetáUniversida de Estadual Paulista—UNESPGuaratinguetáBrazil Faculdades Integradas Teresa D’Ávila—FATEA LorenaBrazil

Zinc alloys coatings formed with elements of group VIIIB are promising because they display similar properties and protect steel by galvanic action. The zn-Ni alloy is remarkable by showing improved mechanical properties and better corrosion resistance when compared to zinc coatings of similar thickness, also can be applied at higher temperatures. In this work, electrodeposits of zn, zn-12%Ni, obtained upon SAE 1010 steel from commercial alkali baths, were treated by blue chromatization and characterized according to mechanical properties and morphology. Studies were carried out by using measures of hardness, roughness, SEM, EDS and XRD. Among the studied electrodeposits, alloys treated by chromatization showed higher corrosion resistance and zn-Ni electrodeposits showed higher value of roughness and hardness, while zinc coating had results similar to the steel substrate By means of XRD, it was found that electrodeposits are crystalline, being identified in zn-Ni alloy the presence of the phases g(Ni5zn21) and d(Ni3zn22), which are responsible for its higher corrosion resistance.

关键词： Corrosion Electrodeposition zn zn alloy

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