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排序方式: 共有195条查询结果,搜索用时 46 毫秒
51.
Characterization of calcium containing plasma electrolytic oxidation coatings on AM50 magnesium alloy 总被引:2,自引:0,他引:2
P. Bala Srinivasan J. Liang C. Blawert M. Störmer W. Dietzel 《Applied Surface Science》2010,256(12):4017-2531
An attempt was made to produce calcium containing plasma electrolytic oxidation (PEO) coatings on AM50 magnesium alloy using an alkaline electrolyte. This study was performed in three alkaline electrolytes containing calcium hydroxide and sodium phosphate with three different mass ratios viz., 1:2.5, 1:5 and 1:7.5. All the three coatings produced were found to contain Ca and P in appreciable amounts. The concentration of P was found to be higher in the coatings obtained in the electrolytes with higher concentration of phosphate ions. Even though all the three coatings were found to be constituted with magnesium oxide and magnesium phosphate phases, X-ray diffraction analyses revealed that the phase composition was influenced by the phosphate ion concentration/conductivity of the electrolyte. Further, the PEO coating obtained in the 1:7.5 ratio electrolyte was found to contain di-calcium phosphate (monetite) and calcium peroxide phases, which were absent in the other two coatings. Potentiodynamic polarization studies performed in 0.1 M NaCl solution showed that the coatings obtained from the 1:5 ratio electrolyte possessed a superior corrosion resistance, which is attributed to the combined effect of thickness, compactness and phase/chemical composition of this coating. 相似文献
52.
The influence of the surface roughness of Mg alloys on the electrical properties and corrosion resistance of oxide layers obtained by plasma electrolytic oxidation (PEO) were studied. The leakage current in the insulating oxide layer was enhanced by increasing the surface roughness, which is a favorable characteristic for the material when applied to hand-held electronic devices. The variation of corrosion resistance with surface roughness was also investigated. The corrosion resistance was degraded by the increasing surface roughness, which was confirmed with DC polarization and impedance spectroscopy. Pitting corrosion on the passive oxide layer was also analyzed with a salt spray test, which showed that the number of pits was not affected by the surface roughness when the spray time reached 96 h. 相似文献
53.
Conductivity data are reported for solutions of [Co(NH3)5NO2]SO4 in water and aqueous dioxane. Ion-pair association constants calculated from the data range from 3.8×102 in water to 4.1×104 in 37% dioxane. A plot of logK
A vs. 1/D is linear with a slope considerably greater than that for simple 2:2 salts. A major factor contributing to enhanced association appears to be ion-dipole interaction. The dipole moment of the complex cation is estimated to be in the vicinity of 6 debye units. 相似文献
54.
电解MnO_2(EMD)是制造锌锰干电池的基本原料,它的放电性能比较好。在使用金属钛作电解阳极时,为获得性能良好的MnO_2和防止金属钛表面钝化,电解电流密度一般在0.6A/dm~2以下。为提高电流密度,Misawa等进行了新的溶液体系研究。本工作用化学 相似文献
55.
在硫酸锰和氯化锰体系中加入浓度相同的钛(Ⅲ)盐,可制得掺钛量不同的电解二氧化锰(EMD)。BET比表面积测定、X光电子能谱、红外光谱分析、阴极电位扫描和恒电流放电实验表明:掺钛EMD的空腔内表面积变大,钛离子在EMD颗粒表层被大大富集。掺进的TiO2进入EMD的晶格,钛使得Mn-O键强度下降。含钛量为0.25~0.4%的EMD(化学式为MnOx)在碱液中放电时,当x>1.80,钛对MnOx放电无明显的影响;当x>1.75,且放电深度为放电的第一步时,钛使EMD的放电极化变小。 相似文献
56.
单室电解法溶解黄铜并测定锌铁铅磷锑铋 总被引:3,自引:1,他引:2
用无隔膜的单室电解池作采样器,电解法采集黄铜样品,由Faraday定律计算采样质量,测定其中的锌、铁、铅、磷、锑、铋。测定结果与酸溶法一致。文中讨论了采样原理、电解质及电解电流的选择。 相似文献
57.
S. V. Gnedenkov S. L. Sinebryukhov V. I. Sergienko 《Russian Journal of Electrochemistry》2006,42(3):197-211
The results of an analysis of the literature data obtained when investigating processes of charge transfer at interfaces of heterostructures formed by various methods, including the high-energy methods, are presented in this paper. The performed investigation of oxide layers at the titanium surface, with use made of impedance spectroscopy data made it possible to reveal the nature and influence of some processes and factors on the charge transfer mechanism realized at a metal oxide heterostructure/electrolyte interface. Simulating an oxide/electrolyte interface gives one a chance to identify, in a spectrum, the responses that characterize the behavior of porous and poreless layers, as well as the responses that are due to the space-charge region formed in the oxide material and to the corrosion and diffusion processes. 相似文献
58.
59.
聚丙烯酸盐增稠剂;;耐电解质性能;长链疏水缔合单体;溶液聚合;反相乳液聚合;聚合工艺对聚丙烯酸盐增稠性能的影响 相似文献
60.
M. Petkovi?S. Stojadinovi? R. Vasili?I. Bel?a Z. Nedi?B. Kasalica U.B. Mio? 《Applied Surface Science》2011,257(22):9555-9561
The growth of silicate tungsten bronzes on aluminum by plasma electrolytic oxidation in 12-tungstosilicic acid is experimentally investigated and discussed. Real time imaging and optical emission spectroscopy characterization of plasma electrolytic oxidation show that spatial density of microdischarges is the highest in the early stage of the process, while the percentage of oxide coating area covered by active discharge sites decreases slowly with time. Emission spectrum of microdischarges has several intensive band peaks originating either from aluminum electrode or from the electrolyte. Surface roughness of obtained oxide coatings increases with prolonged time of plasma electrolytic oxidation, as their microhardness decreases. Raman spectroscopy and energy dispersive X-ray spectroscopy are employed to confirm that the outer layer of oxide coatings formed during the plasma electrolytic oxidation process is silicate tungsten bronzes. 相似文献