阳极氧化膜形成机理探讨

通过对阳极氧化过程各部分电势的分析，利用Ｂｏｌｔａｍａｎｎ分布定律，得出ｐｈ值梯度的概念。根据极板表面发生的化学变化以及电化学变化，阐述氧化铝膜形成的几个过程，并据此对试验和生产中的一些现象做一些简单的解释。     

微孔阳极氧化铝膜的制备及膜的耐蚀性研究

研究了经硫酸溶液和硫酸加醋酸溶液氧化,并经逆向电解法剥离后的氧化铝多孔膜的耐蚀性。实验结果表明：所剥离的膜中性介质中非常稳定,ｐＨ值小于２,膜有微量溶解。ｐＨ值大于１２时,膜的溶解性迅速增大,因此膜在此环境下不宜使用,另外,所研究的膜在草酸介质中也有一定的溶解性。     

电解质对镁合金阳极氧化膜性能影响的研究进展

综述了电解质对氧化膜性能影响，为设计、选用阳极氧化工艺提供参考。随着人类环保意识的增强，未来镁合金阳极氧化电解质研究重点在于开发更多、对环境和人类友好且能较大提高氧化膜耐蚀性的物质。     

阳极氧化铝膜研究的最新进展

本文提出并说明了开发功能阳极氧化膜的基础研究及其应用研究。因此,曾以研究着色或表面硬化为主要目的的论文请允许省略一部分。另外,在该特集号中作为论文登载的预告题目,一部分也是作为演讲要点文集用的。     

多孔阳极氧化铝膜的最佳制备工艺研究

为了得出多孔阳极氧化铝膜的最佳制备工艺,利用正交试验法研究了制备多孔阳极氧化铝膜的影响因素:氧化时间、氧化电压和扩孔时间,分别讨论了各影响因素对阳极氧化铝膜的单独作用;通过扫描电镜(SEM)、X射线衍射仪等观测了阳极氧化铝膜的形貌和结构特征,结果表明:氧化膜上的微孔分布均匀,孔径大小基本相同,平均孔径约为150nm,孔密度约为2.5×109个/cm2;得出阳极氧化最佳制备工艺:温度20℃,反应时间120min,反应电压115V,扩孔时间6min.     

电解质对镁合金阳极氧化膜性能影响的研究进展

综述了电解质对氧化膜性能影响,为设计、选用阳极氧化工艺提供参考.随着人类环保意识的增强,未来镁合金阳极氧化电解质研究重点在于开发更多、对环境和人类友好且能较大提高氧化膜耐蚀性的物质.     

多孔阳极氧化铝膜的制备及电化学阻抗谱分析

在8℃、40V直流电压、0.3 mol/L的草酸电解液中,采用两步阳极氧化法用高纯度铝箔制备多孔阳极氧化铝（AAO）膜。用场发射扫描电子显微镜观察多孔阳极氧化铝膜的形貌。采用电化学交流阻抗法测量多孔阳极氧化铝膜制备过程中一次氧化和二次氧化后的电化学阻抗谱。试验结果表明,所制备的多孔阳极氧化铝膜为高度有序排列的纳米孔洞阵列。根据试验得到的电化学阻抗谱建立了R（QR）（QR）等效电路,该等效电路能较好地表征多孔阳极纳米氧化铝膜的电化学特性,进而找到了等效电路中电学元件与草酸电解液、多孔氧化铝膜的特性及界面电荷转移的关系。该研究有助于研究多孔阳极氧化铝膜的生长过程及形成机理。     

有机添加剂对镁合金阳极氧化膜性能的影响

镁合金作为一种轻质工程材料,具有密度低、比强度和比刚度高、减震性好、导电导热性好、磁屏蔽性能优良等特点,在航空、汽车、通讯和光学领域具有很大的应用前景[1～3].但是镁的化学性质活泼,即使在室温下也会发生氧化腐蚀[4,5],阻碍其在工业     

不同因素对阳极氧化膜质量的影响

通过分析阳极表面双电层的组成和结构，说明了硫酸浓度、电解液中的Ａｌ＾３＋及其他阳离子、槽液的温度、电流密度、阳离子杂质等因素如何影响氧化膜的形成及质量，并描述了ＯＨ＾－的放电以及氧在阳极表面的扩散。     

Electrodeposition of photocatalytic TiO2 film on surface of alumina prepared by anodic oxidation

A new electrochemical method to prepare photocatalytic TiO2 thin film was developed, by which the TiO2 was electrodeposited on surface of alumina by AC electrolysis in solution consisting of K2 [TiO(C2O4 )2] and C2H2O4. The deposited TiO2 thin film was primarily characterized by X-ray diffraction (XRD), scanning electronic microscopy (SEM) and energy dispersive spectrum (EDS) methods. The photocatalytic properties of this film were also studied by the photocatalytic degradation of methyl orange. The results show that the TiO2 film electrodeposited by this method is mainly in amorphous and with a little crystalline component mixed anatase and rutile. The surface of the alumina prepared by anodic oxidation is porous and the TiO2 electrodeposited on it is scattered and incompact. TiO2 thin film fixed on the surface of alumina shows photocatalytic activity to the degradation of methyl orange.     

影响铝型材阳极氧化膜冷封孔质量的因素

铝型材阳极氧化各工艺参数及封孔工序各工艺参数都会影响阳极氧化膜冷封孔的质量，在生产中必须严格控制这些工艺参数。     

Preparation of a two-dimensional polymer film on passivated iron by modification of a carboxylate ion self-assembled monolayer with alkyltriethoxysilanes for preventing passive film breakdown

The effect of an ultrathin, regularly arranged polymer film on prevention of passive film breakdown on iron in the presence of chloride ion was investigated. The film of two-dimensional polymer was prepared by modification of a 16-hydroxyhexadecanoate ion self-assembled monolayer adsorbed on a passivated iron electrode with 1,2-bis(triethoxysilyl)ethane(C₂H₅O)₃Si(CH₂)₂Si(OC₂H₅)₃ and octyltriethoxysilane C₈H₁₇Si(OC₂H₅)₃. The pitting potentials of the passivated electrodes bare and covered with the polymer film were determined by anodic polarization measurements in a borate buffer solution containing 0.1 M of Cl⁻. The pitting potential of the coated electrode was higher than that of the uncoated one, indicating prevention of passive film breakdown. No breakdown was observed over the potential range in the passive and transpassive regions by covering the passive film with the well-arranged two-dimensional polymer film. The film was characterized by X-ray photoelectron and FTIR reflection spectroscopies and measurement of the contact angle with a drop of water.     

电解质中氧化铝含量的测定方法探讨

对测定电解质中氧化铝含量的方法进行了探讨与研究,试验结果表明各种分析方法存在较大差异。     

Preparation of a one-dimensional polymer film on passivated iron by modification of a carboxylate ion self-assembled monolayer with octyltriethoxysilane for preventing passive film breakdown

A self-assembled monolayer (SAM) of 16-hydroxyhexadecanoate ion HO(CH₂)₁₅CO₂⁻(HOC₁₆A⁻) has been prepared on an iron electrode passivated in a borate buffer solution (pH 8.49) in the preceding paper. In this work, the HOC₁₆A⁻ SAM on the passivated electrode was modified with octyltriethoxysilane C₈H₁₇Si(OC₂H₅)₃ to form a film composed of one-dimensional polymer. Prevention of passive film breakdown was examined by anodic polarization measurements of the electrodes uncoated and coated with the modified SAM in the borate buffer containing 0.1 M of Cl⁻. The pitting potential, E_pit of the coated electrode shifted from that of the uncoated electrode in the positive direction, indicating prevention of passive film breakdown. The anodic current density was decreased in the passive and transpassive regions by coverage with the modified SAM. Neither current spikes nor E_pit was observed in the curve of the passive region in some cases, demonstrating complete protection of the passive film against breakdown in the Cl⁻ solution. The modified SAM on the electrode was characterized by X-ray photoelectron and FTIR reflection spectroscopies and contact angle measurement.     

Complete protection of a passive film on iron from breakdown in a borate buffer containing 0.1 M of Cl by coverage with an ultrathin film of two-dimensional polymer

An ultrathin film of two-dimensional polymer was prepared on a passivated iron electrode by modification of a 16-hydroxyhexadecanoate ion self-assembled monolayer with 1,2-bis(triethoxysilyl)ethane (C₂H₅O)₃Si(CH₂)₂Si(OC₂H₅)₃ and octadecyltriethoxysilane C₁₈H₃₇Si(OC₂H₅)₃. This film prevented passive film breakdown examined by potentiodynamic anodic polarization of the coated electrode in the borate buffer solution containing 0.1 M of Cl⁻. Neither current spikes nor the pitting potential was observed in the passive and transpassive regions of polarization curve. The anodic current density was decreased in these regions markedly, implying hindrance to permeation of Cl⁻ and water through the film. Structure of the film was clarified by X-ray photoelectron and FTIR reflection spectroscopies and contact angle measurement with a drop of water. Electron-probe microanalysis of the passivated surface coated with the film after anodic polarization scanning up to the transpassive region revealed that the polymer film prevents pit initiation by an attack on the passive film with Cl⁻.     

Improvement of electrochemical performance of Si thin film anode by rare-earth La PIII technique

Si thin film is considered a good candidate for rechargeable Li-ion thin film battery anode material because it possesses large lithium adsorption capacity, good thermal and chemical stability. However, the fast capacity decay upon charge-discharge cycling has hindered the application of Si thin films. In this investigation, Si thin films were sputtered on Cu foils and characterized. One of the explanations for the bad cycling characteristics is the poor adhesion between the Si film and the Cu substrate. Some Cu foils were treated by Plasma Immersion Ion Implantation (PIII) method using rare-earth La element to improve the adhesion strength between the Si thin films and the Cu substrate in order to enhance the cycling performance. Electrochemical analysis revealed that La PIII surface treatment on the Cu foil substrate was effective in strengthening the interface adhesion between the Si thin films and the Cu substrates. Subsequently, the electrochemical performance of the Si thin film anodes was improved.     

电解液对纯钛表面TiO2多孔膜形态及晶型的影响

以硫酸和氢氟酸为电解液,采用恒压阳极氧化方式,在TA1表面获得多孔TiO2膜,并研究了电解液对TA1表面TiO2多孔膜形态和晶型的影响规律.利用场发射扫描电镜和X射线衍射仪观察了多孔膜的形貌和结构,并对不同晶型多孔TiO2膜的形成机理进行了初步的探讨.结果表明:在硫酸电解液中,通过阳极氧化能够在TA1表面直接形成锐钛型和金红石型TiO2多孔膜,且孔径为100～200 nm;在氢氟酸电解液中,TA1表面获得了大面积的非晶纳米多孔TiO2结构,孔径为10～50 nm.     

Self-assembled monolayers of carboxylate ions on passivated iron for preventing passive film breakdown

Self-assembled monolayers (SAMs) of carboxylate ions C_n−1H_2n−1CO₂⁻ (C_nA⁻) with the carbon number, n=12-18 and 16-hydroxyhexadecanoate ion HO(CH₂)₁₅CO₂⁻ (HOC₁₆A⁻) were prepared on an iron electrode previously passivated in a borate buffer at pH 8.49 by treatment in aqueous solutions of their sodium salts for many hours. Breakdown of the passive film on the electrode coated with the SAM was examined by anodic polarization measurement in the borate buffer containing 0.1 M of Cl⁻. The pitting potentials of the passivated electrodes coated with the SAMs of C_nA⁻ and HOC₁₆A⁻ shifted toward a more positive potential than that of the uncoated electrode, indicating prevention of passive film breakdown by blocking diffusion of Cl⁻ through the SAM to defects of the passive film. No breakdown was observed over the potential range of the passive region by coverage of the passive film with the SAM in some cases. The SAMs on the passive film were characterized by contact angle measurements and X-ray photoelectron and Fourier transform infrared reflection spectroscopies.     

氧化铝碳热还原反应机制及其热力学

研究了球磨活化后氧化铝碳热还原反应合成氮化铝的机理 ,提出了通过氧化铝碳热还原反应合成氮化铝的新机制 :氧化铝首先发生氮化反应生成AlON相 ,AlON再还原氮化生成氮化铝。通过热力学计算得到的反应平衡温度与实验得到的氮化铝开始生成温度相吻合。