掺入纳米级含硅微粒的复合铝氧化膜耐蚀特性研究

采用电化学途径,通过铝合金在一次电解、二次电解过程中,掺入纳米级的含硅微粒,制备掺硅复合铝氧化膜.借助于先进的结构和性能表征手段,探讨了掺硅复合铝氧化膜的结构、组成及耐蚀机理.对膜层进行了盐雾、霉菌、高温、低温、交变湿热和南海服役环境下的自然暴晒试验.结果表明,该膜层具有优良防护性能.

高比容铝电解电容器关键技术进展

简述了铝电解电容器的国内外发展现状,评述了近年来铝电解电容器用高介电常数复合阳极氧化膜及工作电解液的研究进展,指出了相关的技术难点和存在问题,探讨了高比容铝电解电容器的未来技术发展趋势。

Formation and capacitance properties of Ti-Al composite oxide film on aluminum

Al specimens were covered with TiO2 film by sol-gel dip-coating and then anodized in ammonium adipate solution.The structure,composition and capacitance properties of the anodic oxide film were investigated by transmission electron microscopy (TEM),Auger electron spectroscopy (AES),X-ray diffractometry (XRD) and electrochemical impedance spectroscopy (EIS).It was found that an anodic oxide film with a dual-layer structure formed between TiO2 coating and Al substrate.The film consisted of an inner Al2O3 layer and an outer Ti-Al composite oxide layer.The thickness of layers varied with the number of times of sol-gel dip-coating.The capacitance of anodic oxide films formed on coated specimens was at most 80% higher than that without TiO2.In film formation mechanism,it was claimed that the formation of composite oxide film was mainly affected by the structure of micro-pores network in TiO2 coating which had an influence on Al3+ and O2? ions transport during the anodizing.