共查询到19条相似文献,搜索用时 62 毫秒
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中性介质铝表面无机非金属膜层的电化学沉积 (Ⅲ)无机非金属膜层成膜机理初探 总被引:1,自引:1,他引:1
通过分别测定铝在成膜促进剂、络合成膜剂和Na2WO4的不同组合体系中的稳态伏安特性曲线和暂态阳极氧化曲线,及铝在成膜促进剂+络合成膜剂+Na2WO4体系中不同氧化阶段形成的膜层的显微形貌,初步提出了无机非金属膜层的成膜机理,即在特殊电解液和工艺条件下,铝/电解液界面上形成带负电含铝胶体粒子,由于界面化学、电化学和焦尔热的作用,胶体层在阳极不均匀沉积、浓缩、脱水和快速冷却,导致具有特殊结构和性能的无机非金属膜的形成。 相似文献
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在铝阳极氧化膜上沉积金属不仅可以使氧化膜着色, 还可使其具有种种功能。现对几种特殊功能作一说明。 (1)关于热吸收特性 (2)关于太阳能的吸收特性 (3)关于膜的磁记录特性 相似文献
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在恒电流条件下研究V-t曲线,电流波形及膜的表面形貌,低电流密度下,初期V-t曲线不出现峰值,相应的电流波形不发生畸变,阳极氧化和化学氧化都优先发生在基体的缺陷附近。 相似文献
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论述了铝件阳极氧化着色工艺着色的影响因素。采用不同的着色方法着出了色彩均匀柔和饱满的金黄,天蓝 ,金绿,古铜等各种颜色。 相似文献
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当前我国铝阳极氧化冷封闭技术获得广泛应用,前景良好。但如何来确保冷封闭质量达到国际标准(磷-铬酸失重≤30mg/dm^2,仍需要改善铝阳极氧化膜质量以及优选冷封闭工艺参数。 相似文献
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铝阳极氧化膜的各种封闭方法评述 总被引:4,自引:0,他引:4
一概述在现代工业生产中,铝的阳极氧化是一种普遍而有效的表面处理手段。这是由于阳极氧化膜可大大提高铝及其合金的抗腐蚀性和耐磨擦性,利于着色或染色,提供润滑或油漆的良好基底。但阳极氧化膜是一种具有蜂窝状结构的多孔膜,由于孔径极其细小,因而单位表面积上有惊人的微扎数量。据 相似文献
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铝经阳极氧化后其表面将生成一层带有许多微孔的氧化膜,利用铝的这种特性,可以对它进行化学染色、电解着色、电沉积或封闭等各种处理和提高耐蚀性,而这些精饰方法和耐蚀性的提高均与铝阳极氧化膜的表面电荷有着密切关系。本文试图从膜的表面电荷出发来解析膜对离子的吸附、渗透和铝阳极氧化剥离膜在这方面的应用[1]。文中膜均指硫酸阳极氧化膜。1铝阳极氧化膜的表面电荷1.1铝阳极氧化膜的Zeta(ξ)电位-pH图日本黑田孝一[2]等人采用动电位法测得了在不同pH值下铝阳极氧化膜上的ξ电位值(见图1)。当阳极氧化膜处在pH<6的酸性溶液中… 相似文献
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溶液电沉积法是一种具有沉积时间短,可以常温沉积以及沉积物在基底上附着力高等优点的薄膜制备方法.本文用水合肼增溶苝酰亚胺类化合物(PTCDI)的方法制备了可用于溶液电沉积的苝酰亚胺类化合物溶液.用紫外-可见分光光度法(UV-Vis)对溶解的过程进行了表征,并用顺磁共振(ESR)验证了水合肼对PTCDI的增溶过程实质上是化学反应过程.在制备苝酰亚胺类化合物溶液的基础上,采用阳极电沉积法在ITO导电玻璃上沉积出了薄膜.采用UV-Vis,扫描电镜(SEM)和X射线衍射仪(XRD)对薄膜进行了表征,证实得到了表面较为平整、具有可控结晶结构和形貌的PTCDI薄膜以及具有较宽光谱吸收范围的复合薄膜. 相似文献
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Julia Will Martin K. M. Hruschka Lorenz Gubler Ludwig J. Gauckler 《Journal of the American Ceramic Society》2001,84(2):328-32
The aim of the present work is the preparation of thin (<20 μm) zirconia layers on porous substrates with the electrophoretic deposition process. The preparation was completed with a cosintering step of substrate and layer. Through adjustment of shrinkage and the shrinkage rate of the deposited zirconia layer on the presintered porous substrate, thin, dense layers without cracks were prepared. A method for direct control of the layer thickness during the electrophoretic deposition process was developed. The solid oxide fuel cell application with porous anode substrates and thin zirconia electrolytes was chosen to demonstrate the potential of the electrophoretic deposition process. 相似文献
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汞膜电极阳极溶出伏安法测定痕量锗的研究 总被引:3,自引:0,他引:3
提出了一种以铂基汞膜电极阳极溶出伏安法测定痕量锗的方法,发现在pH 7的酒 石酸缓冲溶液中于-1.20 V和-0.50 V左右出现两个溶出峰。锗的浓度在0.01~1 mg/L范围内 与第一个峰(-1.20 V)有良好的线性关系,检出下限为1×10-9。 相似文献
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Polypropylene (PP) polymers are used extensively as dielectric layers, packaging films, and separation membranes, etc. Structure, chemistry, and surface features of PP films dominate their performance and durability. Modification of PP films is carried out using atomic layer deposition (ALD) among other techniques to coat uniform layer of nanometer inorganic material on the surface and inside the pores of PP films to serve the purpose of target applications better. Controlling the reaction temperature, precursor pulsing time, and number of cycles during deposition predominate the thickness, morphology, and composition of the coated layer and hence the performance of PP films. Overall, the ALD technique has been proven to be advantageous in advancing PP film properties such as hydrophilicity, UV resistance, membrane separators, dielectric and mechanical strength, etc., primarily through the controllable formation of nanometer coating on PP films. This review discusses the recent advancements and prospective of ALD in the modification and functionalization of PP films for various applications to provide some insights and motivations to design high‐performance novel PP films by well leveraging the ALD technique. 相似文献
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Anodic, cathodic and cyclic voltammetric deposition of ruthenium oxides from aqueous RuCl3 solutions
Anodic, cathodic and cyclic voltammetric (CV) deposition of ruthenium oxides from aqueous RuCl3 solutions have been investigated using stationary and rotating disk electrodes (RDE) in this work. The CV deposition behavior was examined using a RDE to differentiate the contribution of current from the reactions of ruthenium ions in the electrolyte and ruthenium oxides already adsorbed on the electrode. The results indicate that the CV growth of ruthenium oxides within the potential range of aqueous electrolyte decomposition is attributed to the anodic oxidation of ruthenium ions in the electrolyte. Cathodic deposition occurs only at potential negative than −0.30 V versus saturated calomel electrode (SCE) when H2 evolves on the electrodes. Anodic deposition of ruthenium oxides can be obtained effectively in the potential range of ca. 0.9-1.1 V versus SCE, depending on the pH value of the electrolyte. The optimum anodic and cathodic deposition potential for maximum deposition efficiency is 1.0 and −0.9 V versus SCE, respectively, in the electrolyte solution of pH 2. 相似文献