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采用电子能谱 (EDS)、X射线衍射 (XRD)、扫描电镜 (SEM )等现代表面分析方法对铸铝在有机羧酸混合体系中电化学沉积陶瓷覆膜的成分、结构及形貌进行了详细的研究 ,并对类陶瓷膜层的成膜过程及机理进行了初步讨论。结果表明 ,膜层组成元素为氧、铝、硅、磷、硫和碳。主要组成物为铝的氧化物、氢氧化物及它们的水合物 ,同时还有少量含磷、硫、碳的复杂化合物。SEM分析表明 ,膜层由大量直径 0 .1~ 0 .3μm的圆球状颗粒沉积而成。沉积膜可分为紧密层和疏松层。紧密层与基体金属结合牢固 ,且紧密层中存在大量纳米尺寸的微裂纹和颗粒。由此提出在特殊的电解液和工艺条件下 ,铸铝 /电解液界面首先形成阴离子凝聚物 ,由于界面化学、电化学反应和其他变化 ,凝聚层在阳极表面沉积、浓缩 ,经高温脱水和快速冷却 ,形成具有特殊结构和性能的类陶瓷膜层。 相似文献
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1 INTRODUCTIONConducting polymers, due to their potentialapplication prospects, have been investigated ex tensively during the past decade[1 10]. Conductingpolyaniline (PANI), on account of its excellent op tical and electronic properties, is promising inmany fields, such as electronic devices, electro chromic devices, and ion switching devices[11 16].The morphology of conductive PANI can varygreatly with the preparation methods and condi tions. Gene… 相似文献
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The electro-polymerization behavior of aniline in reverse(W/O) microemulsion was investigated. The experiment results show that the cyclic voltammetry polymerization behavior of aniline in W/O microemulsion is different from that in aqueous solution remarkably. With the increase of scan cycle, the oxidation potential shifts positively and the reduction potential shifts negatively, i.e., the redox potential difference increases. H+ apparent concentration affects the aniline polymerization evidently. When H+ concentration is lower than 0.08 mol/L, the electro-polymerization of aniline is difficult. With the increase of H+ concentration, the polymerization current of aniline increases gradually. Only when H+ concentration is high enough(0.5 mol/L), aniline can be well electro-polymerized. Moreover, under the same condition, the aniline polymerization current in W/O microemulsion is higher than that in aqueous solution. The scanning electron microscopy image shows that the deposited polyaniline(PANI) has uniform fiber morphology with diameter of about 100 nm. Further study result suggests that the electrochemical activity of the PANI in HCl is similar to that of the PANI prepared in aqueous solution. 相似文献