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,SEM,极化曲线及电化学阻抗谱技术研究氧化膜的性能.结果表明:通过水滑石前驱法能制备Al-Li复合阳极氧化膜,膜中Li 含量可达8%;与纯铝氧化膜相比,复合氧化膜更加致密;无论是否封闭,Al-Li复合氧化膜在中性NaCl溶液中的耐蚀性都较纯铝氧化膜更好. 关键词:锂;水滑石;阳极氧化膜;铝;腐蚀 中图分类号:TB 33; TG 146.21; TG 172  ...种重要的增强元素[12].根据前人的研究,在Al-Li合金的氧化过程中,合金中固溶体中的锂原子能立即与形成的非晶态氧化铝膜结合,据推测Li+向外迁移速度比Al3+快[13].Skeldon等[14]研究了Al-Li合金氧化膜的结合强度性能.McCafferty[4]研究了几种不同元素对铝在0.1 mol/L NaCl溶液中孔蚀电位的影响,发现在铝表面,Li的引入降低了孔蚀电位,并指出Zr,Ta和......
-state diffusion bonding is the main problem [4]. On the other hand, PRESCOTT and GRAHAM [5] showed that the existence of oxide film on the aluminum surface impeded good metal to metal contact. In order..., bumps are more likely to deform. So, more rupture occurs in the oxide layer, and the metal-to-metal joint is improved. Fig. 4 BSE image of interface (a), EDS maps for Al, Ti and Sn (b), higher......
alloys [J]. Thin Solid Films, 2003, 426: 271-280. [7] LI X, NIE X, WANG L, NORTHWOOD D O. Corrosion protection properties of anodic oxide coatings on Al-Si alloy [J]. Surface and Coating Technology... be possible that a small proportion of oxalates species are included into the oxide film during the very initial stage in which a very high electric field is generated in the thin surface layer......
J. Cent. South Univ. (2020) 27: 1645-1653 DOI: https://doi.org/10.1007/s11771-020-4396-9 Evolution of surface roughness of a cast Al-Si-Cu piston alloy during thermal exposure BAO Tong(保彤)1, LI... related to phase transformation and oxidation during the thermal exposure. Key words: surface roughness; thermal exposure; Al-Si-Cu piston alloy; microstructure; oxidation Cite this article as: BAO Tong, LI......
at the heating rate of 20 ℃/min from 75 to 500 ℃ under a nitrogen atmosphere. 3 Results and discussion 3.1 XRD analyses of surface layer Fig.1 shows the XRD patterns of 7A04 Al alloy specimens... be concluded that the nanocrystalline layer of 7A04 Al alloy has better thermal stability than the matrix. And the DSC measurement shows that the synthesis of a nanostructured surface layer has......
μm. Fig.2 SEM images of magnesium alloy after activation 3.2 Chemical composition of fluoride film XPS was used to study the surface composition and chemical states of the elements of fluoride film. Fig.3 shows the XPS spectrum of the fluoride film on magnesium alloy after activation. It can be seen that F was the main element on the surface, as well as micro constituent O and Al. Fig.4 shows......
织相对粗大呈长条状,长度方向晶粒平均尺寸约30 ?m,板法向方向晶粒尺寸约为12 ?m;各层所占厚度约为板材总厚度的1/3(见图1(b)). 图1 01420铝锂合金的典型微观组织 Fig.1 Typical microstructures of 01420 Al-Li alloy: (a) Original 8.5 mm thick plate after solution...程中,如图3(c)所示,第二相主要沿着这些晶粒的晶界析出,而在晶粒内部析出比较少,所以第二相主要呈条带状平行轧制方向分布. 图3 01420铝锂合金的第二相SEM二次电子像 Fig.3 SEM secondary electron images of second phase particles in 01420 Al-Li alloy: (a) Aged......
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Film Layer Structure and Wear Resistance on High Strength Room Temperature Blackening of Cu-Se-P System ZHANG Yu-feng1,WANG Jian-cheng1,ZHOU Hou-qiang1 (1.Wuhan Ordnance Noncommissioned Officer School, Wuhan 430075 ,China) 摘要:In this paper,the high strength room temperature blackening film on steel surface were prepared, the structure and the forming principle of the film were studied. The Cu......
J. Cent. South Univ. (2020) 27: 1714-1728 DOI: https://doi.org/10.1007/s11771-020-4402-2 Evaluation of surface roughness and optimization of cutting parameters in turning of AA2024 alloy under... of cutting edge was also controlled by MQL technique. Key words: cooling-lubrication methods; surface roughness; minimum quantity lubrication; response surface methodology; AA2024 aluminum alloy Cite......