共查询到20条相似文献,搜索用时 15 毫秒
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镁合金是最轻的金属结构材料,具有比强度高、比刚度高、导电导热性好、生物相容性好等优点,在汽车、航空航天、电子、生物医学等领域有着广阔的应用前景。然而,镁自身化学活性极高且其表面的原生氧化膜疏松多孔,无法有效保护基底,往往在各加工工序间就会发生表面腐蚀。严重的腐蚀问题已经成为制约镁及其合金应用与发展的主要短板,因此,对镁合金进行表面防护处理是极为重要的。现阶段,镁合金的表面处理方法虽然种类繁多,但防护效果良莠不齐。重点综述了两种常用的镁合金表面改性技术--化学转化膜技术和微弧氧化技术的新进展,并介绍了一种基于活性CO2处理提高镁合金耐蚀性的新技术,以及仿生超疏水表面在提升镁合金耐蚀性上的应用,最后,对镁合金表面改性与防护的未来发展方向进行了展望。 相似文献
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镁及其合金表面防护性涂层国外研究进展 总被引:21,自引:4,他引:21
综述了近年来国外镁及其合金表面防护性涂层的研究进展,其中包括化学转化涂层、阳极氧化膜层、镀层(电镀、化学镀)、扩散膜层、激光表面合金改性层、气相沉积层及有机涂层等在镁合金基体上的应用情况,分析了其各自的利弊,并对镁合金表面防护技术的发展方向进行了展望. 相似文献
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镁合金电偶腐蚀研究及其进展 总被引:2,自引:0,他引:2
研究了镁合金AM60与异种金属Q235碳钢、18-8不锈钢、LY12铝合金和纯铝之间的电偶腐蚀,介绍了镁合金电偶腐蚀的最新研究进展,重点探讨了影响镁合金电偶腐蚀的因素和减轻镁合金电偶腐蚀的措施,最后提出了镁合金电偶腐蚀研究中需要解决的科学问题.研究和讨论分析表明,为防止镁合金电偶腐蚀,应全面而系统地进行合理的结构设计、选择合适的匹配材料、在镁合金和异种金属表面分别涂装性能优良的耐碱性涂层体系.由于镁腐蚀发生碱化,所以防止电偶腐蚀的环境应避免选用含铝涂层体系. 相似文献
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超高强韧镁合金的研发对推广镁合金在高技术领域的应用具有重要意义。镁与稀土均是我国的优势资源,因此在我国发展超高强韧稀土镁合金具有得天独厚的优势,其中Mg-Gd-Y-Zn-Zr系变形镁合金因其接近高强铝合金的超高强度和塑性,近年来受到研究者的广泛关注。综述了超高强韧Mg-Gd-Y-Zn-Zr系变形镁合金的合金成分、常规塑性变形工艺、新型剧烈塑性变形工艺和热处理工艺对该合金显微组织和力学性能的影响规律,以及该超高强韧变形镁合金的显微组织特征和强韧化机理。T5峰时效态超高强韧Mg-8.2Gd-3.8Y-1Zn-0.4Zr(质量分数)挤压合金具有双峰分布的晶粒尺寸“软-硬”复合层片微结构,以及由高密度的基面γ′纳米片状析出相和棱柱面β′纳米析出相形成的近连续网状结构,该挤压合金室温拉伸屈服强度、拉伸强度和断裂延伸率分别为466 MPa、514 MPa和14.5%。介绍了哈尔滨工业大学等单位在超高强韧Mg-Gd-Y-Zn-Zr系变形镁合金的规模化制备和应用方面的研究进展,并展望了Mg-Gd-Y-Zn-Zr系变形镁合金的发展趋势。 相似文献
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The purpose of this paper is to provide a succinct but nevertheless complete mechanistic overview of the various types of magnesium corrosion. The understanding of the corrosion processes of magnesium alloys builds upon our understanding of the corrosion of pure magnesium. This provides an understanding of the types of corrosion exhibited by magnesium alloys, and also of the environmental factors of most importance. This deep understanding is required as a foundation if we are to produce magnesium alloys much more resistant to corrosion than the present alloys. Much has already been achieved, but there is vast scope for improvement. This present analysis can provide a foundation and a theoretical framework for further, much needed research. There is still vast scope both for better fundamental understanding of corrosion processes, engineering usage of magnesium, and also on the corrosion protection of magnesium alloys in service. 相似文献
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N. Winzer A. Atrens G. Song E. Ghali W. Dietzel K.U. Kainer N. Hort C. Blawert 《Advanced Engineering Materials》2005,7(8):659-693
This review aims to provide a foundation for the safe and effective use of magnesium (Mg) alloys, including practical guidelines for the service use of Mg alloys in the atmosphere and/or in contact with aqueous solutions. This is to provide support for the rapidly increasing use of Mg in industrial applications, particularly in the automobile industry. These guidelines should be firmly based on a critical analysis of our knowledge of SCC based on (1) service experience, (2) laboratory testing and (3) understanding of the mechanism of SCC, as well as based on an understanding of the Mg corrosion mechanism. 相似文献
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The high strength to weight ratio of magnesium alloys makes them extremely attractive for applications in transport or aerospace technology. However, their corrosion behavior is a major issue and one reason why they are still not as popular as aluminum alloys. This papers reviews the corrosion mechanisms of magnesium and provides the basis for the design of new alloys with improved corrosion properties. 相似文献