吴玉程
,
郑红梅
,
刘家琴
,
崔接武
,
王岩
,
秦永强
,
洪雨
,
刘勉诚
功能材料与器件学报
铝电解电容器因其成本低廉、存储电容量高而广泛应用于各种各样的电子设备中.市场化经济的快速发展对铝电解电容器的小型化、高比容、低成本、高频低阻抗等性能要求日益激烈.根据电容器的结构特点可知提高铝电解电容器高性能的关键技术就是要提高阳极铝箔的比表面积.本文从铝原箔的质量包括化学成分、组织结构、表面质量,以及腐蚀技术包括改进工艺、添加缓蚀剂、采用模板控制等方面,总结目前科学家在提高铝电解电容器用阳极箔比表面积研究工作的进展.
关键词:
高纯铝箔
,
立方结构
,
比表面积
,
电解电容器
,
点蚀
Jingbo SONG
,
Weimin MAO
材料科学技术（英）
The effect of trace Sn on the pitting morphology of high voltage anode aluminum foils was investigated. The distributions of microelement Sn, Fe, Si, Cu and Mg in the surface layer of aluminum foils with different Sn content were determined by using a secondary ion mass spectrometer. It was found that the micro-alloyed Sn is enriched at the external surface. The mechanism of pitting behavior of trace Sn on aluminum surface is similar with that of lead. Enrichment of Sn in the surface layer provides large numbers of sites for initiation of pitting corrosion, while pitting sites appeared relatively inhomogenously in the foils without Sn. Sn, as an eco-friendly microelement, can be applied to replace Pb in improving the homogenous pitting behaviors of high voltage aluminum foils, in which the volume fraction of cube texture is not reduced.
关键词:
Electrolytic capacitor
,
铝箔
,
锡
,
孔腐蚀
Bangyi CHEN
,
Chenghao LIANG
,
Daojun FU
材料科学技术（英）
Electrochemical test technology and surface analysis method were employed to investigate the pitting corrosion of Cu-Zn-Al shape memory alloy in simulated uterine fluid. The results showed that the breakage of the breaking-renovating equilibrium of surface layers resulted in the pitting corrosion of Cu-Zn-Al shape memory alloy in simulated uterine fluid. The development of pitting corrosion was controlled by dissolution of surface layers. The critical pitting corrosion potential was 1.70 VSCE. The kinetics equation for the development of pitting corrosion for Cu-Zn-Al shape memory alloy in simulated uterine fluid was i0=465.68 t-0.5+1.5. Pitting appearances of pits could be two types: tortoise-shell, and anomaly abscess. Cl- ion facilitated the pitting corrosion of Cu-Zn-Al shape memory alloy by competing adsorption and concentrating on alloy surface at high positive potential.
关键词:
Cu-Zn-Al Shape memory alloy
,
null
,
null
S.S.Mahmoud
,
M.M.Ahmed
材料科学技术（英）
Colouring of the austenitic stainless steel alloy (20.45% Cr, 8.57% Ni) was carried out in NaNO3-KNO3 eutectic melt without and with additions of Na=O2, NaCl and their mixtures at different temperatures ranging from 400–600℃, under open-circuit and galvanostatic anodic polarization conditions. The produced colours greatly depend on the thickness of oxide films, which in turn depends on the composition of the molten bath and its temperature. The more attractive, bright, adherent and uniform coloured oxide films can be obtained at 400, 450 and 500℃ in molten nitrate bath containing NaCl and Na2O2 mixtures. The pitting corrosion susceptibility of the coloured oxide films was tested in FeCl3 and NaCl as corrosive media. The obtained results indicate that the pitting corrosion susceptibility of the coloured oxide films greatly depends on the previous operating conditions of the colouring process of the stainless steel specimens such as the composition of molten bath, temperature and technique of colouring process.
关键词:
Stainless steel alloy
,
null
,
null
