共查询到19条相似文献,搜索用时 125 毫秒
1.
2.
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
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
镁及镁合金作为硬组织植入替代材料具有显著的优越性,但如何对镁及镁合金进行表面改性以满足临床应用对生物材料耐蚀性能的苛刻要求,仍然是解决镁及镁合金在生物材料领域产业化应用的关键。本文综述了为提高镁基生物材料耐蚀性能研发的涂层材料种类、涂层表面改性技术的研究现状,提出了结合多种制备方法,通过对涂层的组成和结构设计来改善涂层的结合强度、稳定性及良好的生物适应性是今后努力的方向。 相似文献
13.
The magnesium alloys occupy an important place in marine applications, but their poor corrosion resistance, wear resistance,
hardness and so on, have limited their application. To meet these defects, some techniques are developed. Microarc oxidation
is a one such recently developed surface treatment technology under anodic oxidation in which ceramic coating is directly
formed on the surface of magnesium alloy, by which its surface property is greatly improved. In this paper, a dense ceramic
oxide coating, ∼20 μm thick, was prepared on an Y1 magnesium alloy through microarc oxidation in a Na3SiO3-Na2WO4-KOH-Na2EDTA electrolytic solution. The property of corrosion resistance of ceramic coating was studied by CS300P electrochemistry-corrosion
workstation, and the main impact factor of the corrosion resistance was also analysed. Microstructure and phase composition
were analysed by SEM and XRD. The microhardness of the coating was also measured. The basic mechanism of microarc coating
formation is explained in brief.
The results show that the corrosion resistance property of microarc oxidation coating on the Y1 magnesium surface is superior
to the original samples in the 3·5 wt% NaCl solutions. The microarc oxidation coating is relatively dense and uniform, mainly
composed of MgO, MgAl2O4 and MgSiO3. The microhardness of the Y1 magnesium alloy surface attained 410 HV, which was much larger than that of the original Y1
magnesium alloy without microarc oxidation. 相似文献
14.
TiAl合金具有优异的高温力学性能,可以作为Ni基高温合金的轻量化替代材料,但氧化和磨损等行为限制了TiAl合金的高温服役时间,不利于工业化应用。通过在TiAl合金表面沉积涂层,可以使材料兼具基体的力学性能和涂层材料的表面性能,以提高TiAl合金适应不同服役环境的能力,进而拓展其应用范围。列举了TiAl合金使用的涂层材料应具有的性质;介绍了常见涂层的制备方法;以涂层成分分类,分别总结了不同涂层体系的研究现状,并展望了制备工艺和涂层性能的发展趋势。 相似文献
15.
16.
镁合金阳极氧化的研究与发展现状 总被引:17,自引:0,他引:17
综述了镁合金阳极氧化工艺的研究与发展现状,包括着色和密封技术,阳极氧化涂层的反应机理和结构,以及镁和铝阳极氧化之间的异同点,提出了进一步研究和开发的方向。 相似文献
17.
18.
H. Hoche Dr.‐Ing. D. Allebrandt H. Scheerer E. Broszeit C. Berger 《Materialwissenschaft und Werkstofftechnik》2007,38(5):365-371
Although magnesium alloys became popular in the first half of the 20th century, the bad corrosion properties prevented their breakthrough in industrial mass production. Since the technology for the production of high purity alloys was introduced in the 1970s, magnesium alloys became more and more in the focus of industrial attention. Today magnesium alloys are state of the art in structural parts in automotive industry. Despite its outstanding properties like good castability, low density and nearly unlimited availability the negative aspects like weak corrosion and wear behaviour still limit the application of magnesium in industry [1]. So, the only economic solution is the deposition of a coating or a suitable surface treatment which provides both, wear and corrosion resistance. Today, plasma electrolytic anodisations are state of the art [2–5]. They provide acceptable corrosion resistance and protect the magnesium from mechanical damage due to their high hardness. On the other hand, their high porosity limits their use in combination with electrochemically noble materials, leading to galvanic corrosion [6]. In addition, the high surface roughness of the plasma electrolytic anodisations restricts their use in tribological applications, particularly under dry sliding conditions [7]. On the other hand, due to the high life time recommendations the application of magnesium in the automotive industries motion component field is a long term process. Nevertheless, there is a quite high industrial interest to apply magnesium in the motion component field in consumer applications like do‐it‐yourself or gardenig. Some examples are motor components of lawnmovers, motor saws or drills. Especially for these fields of application there are quite high demands on the corrosion properties due to undefined storage and the conditions during usage. In order to achieve smooth surfaces with high quality, the PVD technology moves into the centre of interest. Since the 1980s PVD coatings are well established and widely used for different industrial applications, mainly for steel and tool coatings. The authors were the first who carried out serious studies on the development of PVD coatings for magnesium alloys since 1999 [6, 7]. The extensive research activities lead to the recent development of a coating system, which provides both, good wear properties as well as good corrosion behaviour. 相似文献
19.
Magnesium alloys have wide applications in automobiles, aerospace and so on due to many advantages, while a number of undesirable
properties including poor corrosion resistance, inferior creep resistance and bad plastic processing ability have hindered
their applications. Creep-resistant magnesium alloy design, plastic processing of magnesium alloys and rapid solidification
processing of magnesium alloys have become the hot topics in magnesium technology. Other than these, surface modification
as well as laser beam welding are also involved. The research progress and development in magnesium technology in China are
reviewed in the paper. 相似文献