偏铝酸钠对铝基复合材料表面微弧氧化膜性能的影响

在含偏铝酸钠的电解液体系中,通过微弧氧化技术在铝基复合材料表面制备了微弧氧化膜。研究了偏铝酸钠的质量浓度对微弧氧化膜的表面形貌、成分、晶体结构、结合力及耐蚀性的影响,同时研究了电解液的利用效率。结果表明:当偏铝酸钠的质量浓度为1.8 g/L时,电弧大小适中,微弧氧化膜的结合力和耐蚀性均较好,并且电解液中不易形成氢氧化铝胶体沉淀。     

硬铝合金表面微弧氧化着色工艺研究

介绍了利用微弧氧化的方法在铝合金基体上制备有色陶瓷层的工艺研究,通过微弧实验得到制备黑褐色及深黑色膜的最佳工艺.分析了电解液的成分以及添加剂的质量浓度对氧化膜着色的影响,并讨论了实验过程中可能出现的问题及解决办法.     

镁合金微弧氧化膜的制备及其性能研究

通过对微弧氧化电解液进行优化,得出了最佳配方,并对微弧氧化膜的性能进行了测试。镁合金微弧氧化的最佳工艺条件为:Na_2SiO_320g/L,Na_2B_4O_730g/L,NaOH 30g/L,氧化时间20min。向电解液中加入醋酸镍后,生成含有Ni_2SiO_4的深灰色微弧氧化膜,该膜层较厚且耐蚀性进一步提高。微弧氧化膜表面光滑、致密,但存在少量的微孔和裂纹。微弧氧化膜的主要成分为MgO、Mg_2SiO_4、Ni_2SiO_4和SiO_2,微弧氧化处理显著提高了镁合金基体的耐蚀性。     

锌合金表面微弧氧化层制备及性能研究

使用脉冲模式微弧氧化法在锌合金表面制备陶瓷膜层。通过扫描电镜观察、XRD分析、电化学腐蚀试验和摩擦磨损试验等,研究了不同电解液体系中工艺条件(电解液浓度、电参数、氧化时间等)对微弧氧化膜层结构及其相关性能的影响。     

镁合金微弧氧化膜的制备工艺研究

采用微弧氧化装置制备微弧氧化膜,并研究了向电解液中添加稀土盐直接微弧氧化与在稀土盐溶液中浸泡后再微弧氧化的区别。结果表明:向电解液中添加稀土盐直接微弧氧化得到的微弧氧化膜表观较差,且电解液放置一段时间后失效;而在稀土盐溶液中浸泡后再微弧氧化得到的微弧氧化膜表观较好,有效地提高了材料的性能,且电解液可以重复利用。     

LY2铝合金运动器材的耐腐蚀性能研究

研究了微弧氧化主盐溶液中十二烷基苯磺酸钠和十二烷基硫酸钠浓度对运动器材用LY2铝合金表面微弧氧化膜层厚度、膜层表面和截面形貌、物相组成和电化学性能的影响。结果表明,随着电解液中十二烷基苯磺酸钠浓度的提高,微弧氧化涂层的厚度呈现先增加而后减小的趋势,在十二烷基苯磺酸钠浓度为0.04g/L时取得涂层厚度最大值;随着电解液中十二烷基硫酸钠浓度的提高,微弧氧化涂层的厚度呈现波浪形变化,但是整体呈现出降低的特征;添加不同浓度十二烷基苯磺酸钠或十二烷基硫酸钠后得到的微弧氧化涂层的腐蚀电位都要相对基础主盐涂层更正,相应的耐腐蚀性能更好,且在主盐溶液中添加0.08g/L十二烷基苯磺酸钠或者0.03g/L十二烷基硫酸钠可以获得耐腐蚀性能较好的涂层;微弧氧化膜层的厚度与耐腐蚀性能之间没有明显的对应关系,而与膜层中显微孔洞数量及其分布有关。     

各参数对AZ91D镁合金微弧氧化膜层质量影响的研究

使用自行研制的微弧氧化电源,研究分析了电解液成分、电参数及氧化时间等因素对AZ91D镁合金氧化膜层质量的影响.研究表明:电解液成分决定着膜层的成分与性能,铝酸盐体系电解液中形成的氧化膜层耐蚀性、耐磨性和硬度明显不如硅酸盐体系电解液;带放电回路的脉冲电源要明显地优于其它电源;电压、电流密度、脉冲宽度、氧化时间、频率和占空...     

铝酸钠对镁-锂合金微弧氧化膜耐蚀性的影响

为了进一步提高镁-锂合金的理化性能,将不同质量浓度的铝酸钠添加到硅酸盐体系的电解液中,制备出镁-锂合金微弧氧化陶瓷膜。通过对膜层的表面形貌、组成及耐蚀性的研究,分析了铝酸钠的质量浓度对镁-锂合金微弧氧化膜的组成、厚度、结构及性能的影响。研究结果表明:与未添加铝酸钠的微弧氧化膜相比,加入铝酸钠后,微弧氧化膜表面单位面积内的微孔数量减少,孔径明显变小,且其耐蚀性大幅提高。     

LF4合金次磷酸钠体系微弧氧化

通过对次磷酸钠、硅酸钾、六偏磷酸钠三种电解液的质量浓度及膜层制备中的各种影响因素进行分析,确定了以NaH2PO2为主成膜剂的最佳电解液配方。详细研究了各种工艺参数(包括电流密度、微弧氧化时间、电解液温度)的改变对微弧氧化膜性能的影响。     

不同电解液中镁合金微弧氧化膜生长过程及腐蚀防护性能

对AZ31镁合金在3种电解液(NaAlO_2,Na_2SiO_3,Na_3PO_4)中进行微弧氧化处理,采用扫描电子显微镜和X射线能谱仪分析了不同电解液体系下微弧氧化膜的表面和截面形貌及其元素分布情况,采用X射线衍射分析了微弧氧化膜生长过程中物相组成的变化情况,利用电动位极化、电化学阻抗和析氢测试比较了不同电解液体系中制备的相同厚度(～15mm)氧化膜的腐蚀防护性能,并根据不同电解液体系中微弧氧化膜生长过程特点,探讨了氧化膜腐蚀防护性能差异的原因。结果表明:在铝酸盐中生长主要以阴离子化合物沉积为主,氧化膜倾向于向外生长,而在硅酸盐和磷酸盐中,这2种膜层的生长很大一部分来自于基体的氧化,导致其向内生长都占据了主要地位,不同的生长方式导致膜层对基体的腐蚀防护性能不同(AZ31-SAZ31-PAZ31-Al)。     

铝合金在不同溶液中的微弧氧化膜层性能研究

分析了ＬＹ１２铝合金在不同电解质溶液生成的微弧氧化膜,比较了微弧氧化膜厚度在不同溶液中随时间的变化。通过扫描电镜和电子探针分析微弧氧化膜的横截面结构,化学成分以及这些元素在微弧氧化膜载面不同位置的分布。实验结果表明微弧氧化膜的生长速度在不同溶液中各个同,但厚度随时间的变化规律基本相同。     

不同控制方式下占空比对钛合金微弧氧化膜的影响

分别以恒电压和恒电流两种方式进行TC4钛合金的微弧氧化,研究两种方式下占空比对钛合金微弧氧化膜的影响.结果表明:占空比对电流密度和电压的不同作用决定了占空比对氧化膜厚度和粗糙度的影响,恒电压方式下,增加占空比,氧化膜的生长速率增大,表面变得粗糙,而且占空比的作用比在恒电流方式下更显著,因此,在恒电压方式下通过改变占空比控制氧化膜的形成更有效.     

Formation of anode oxide films on zirconium by means of the microspark anode oxidation in sodium silicate solutions

The microspark oxidation (MSO) (also known as microarc oxidation (MAO) or plasma electrolytic oxidation (PEO)) is one of the methods used for the formation of oxide coatings on valve metals. The main advantage of the MSO method, along with many others, consists in the simplicity of the technology of formation of films having a high adhesion to a metal substrate. The method enables one to obtain high-quality porous anode oxide films for different applications: antifriction, anticorrosion, for sensor materials, etc. In this work, the anode oxide films consisting of a mixture of three modifications of zirconia and a silica amorphous phase were formed on a zirconium foil from a sodium silicate aqueous solution by means of the MSO method.     

Effect of aluminum annealing on the galvanoluminescence properties of anodic oxide films formed in organic electrolytes

The galvanoluminescence (GL) properties of anodic oxide films formed in organic electrolytes were investigated at different aluminum annealing temperatures. The results of the spectral measurements showed two different types of GL sources: carboxylate ions incorporated in oxide films during the anodization and the molecules AlH, AlO, Al₂, AlH₂, also formed during anodization process and already recognized in the case of inorganic electrolytes. The latter was related to gamma alumina crystalline regions formed by annealing of the aluminum samples at temperatures above 500 °C.     

Ionic conduction in anodic oxide films on aluminium in molten LiNO3 + KNO3 + NaNO3 electrolyte

Steady-state ionic conduction studies in the anodic growth of films on aluminium in molten LiNO₃ + NaNO₃ + KNO₃ have been made. The breakdown voltage of the film is 73 V, unaffected by change of cd or temperature. The film-forming characteristics of anodic oxide films on aluminium in molten salt electrolytes are different from that of anodic films formed in aqueous electrolytes. The Tafel slope decreases with increase of temperature. Dignam's equation for ionic conduction has been examined critically. His parameter μ^* depends on temperature, whereas i₀ and φ are temperature-independent, which explains the variation of Tafel slope with temperature.     

工业纯钛TA2的阳极氧化工艺研究

通过对以C6H11O7Na,Na3PO4两种成分为电解液所形成的阳极氧化膜性能的比较,选用Na3PO4为主要成分的电解液。采用正交实验着重分析了Na3PO4的质量浓度、电压及氧化时间对在工业纯钛TA2上所形成的阳极氧化膜的显微硬度和耐蚀性的影响。结果表明:随Na3PO4的质量浓度的增大,其硬度和耐蚀性都呈增大趋势。综合阳极氧化膜的成膜速率和颜色的均匀性,得出工业纯钛TA2阳极氧化的最佳工艺条件为:Na3PO4200 g/L,电压20 V,氧化时间20 min。     

Solid-state electrochromic devices using pTMC/PEO blends as polymer electrolytes

Flexible, transparent and self-supporting electrolyte films based on poly(trimethylene carbonate)/poly(ethylene oxide) (p(TMC)/PEO) interpenetrating networks doped with LiClO₄ were prepared by the solvent casting technique. These novel solid polymer electrolyte (SPE) systems were characterized by measurements of conductivity, cyclic voltammetry, differential scanning calorimetry and thermogravimetry.The incorporation of solid electrolytes as components of electrochromic devices can offer certain operational advantages in real-world applications. In this study, all-solid-state electrochromic cells were characterized, using Prussian blue (PB) and poly-(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT) as complementary electrochromic compounds on poly(ethyleneterphthalate) (PET) coated with indium tin oxide (ITO) as flexible electrodes. Assembled devices with PET/ITO/PB/SPE/PEDOT/ITO/PET “sandwich-like” structure were assembled and successfully cycled between light and dark blue, corresponding to the additive optical transitions for PB and PEDOT electrochromic layers. The cells required long cycle times (>600 s) to reach full color switch and have modest stability towards prolonged cycling tests. The use of short duration cycling permitted the observation of changes in the coloration-bleaching performance in cells with different electrolyte compositions.     

Effect of doped niobium pentoxide on structure and properties of hafnium oxide films deposited by ion beam assisted deposition

Hafnium oxide is widely used in optical coating materials because of its high refractive index, broad band gap, high laser damage threshold and its high transparency in the wavelength range from ultraviolet to middle infrared (0.20–12 μm). However, hafnium oxide has some defects such as strong crystallinity and poor surface quality, which results in enhanced absorption and reflection of light wave and limits its application in optical field. As a pentoxide with high transparency and excellent optical properties in the wavelength range from ultraviolet to mid-infrared(0.35–9 μm), the doping of niobium pentoxide can effectively improve the surface quality and optical properties of the films. Mixed films with different chemical compositions were prepared by ion beam assisted deposition, and the microstructure, crystallinity, surface quality, optical properties and mechanical properties of the mixed films with different chemical compositions were investigated. The doping of niobium pentoxide inhibits the crystallization of hafnium oxide, optimizes the surface quality of the films, and improves the refractive index and mechanical properties of mixed films, effectively broadens the application of hafnium oxide in the field of optical films.     

铸造铝合金微弧氧化膜的生长动力学及耐蚀性能

研究了ZL101铸造铝-硅合金微弧氧化陶瓷膜的生长动力学,探讨了膜生长厚度与电流密度(i)和生长速率(v)的关系.分析了膜的形貌和相组成,并用电化学法测量不同膜样品厚度的极化曲线.结果表明:膜生长分为3个阶段,氧化初期,i较高,但膜层生长较慢.在膜快速生长阶段,膜生长速率达到极大值.膜生长进入平稳期后,i基本保持恒定,样品的外部尺寸不再增加,膜逐渐转向基体内部生长.合金化元素硅的影响主要表现为氧化初期对膜生长的阻碍作用.铸造铝合金经过微弧氧化处理后,腐蚀电流大幅下降,极化电阻增加了几个数量级.较薄的微弧氧化膜同样大幅度提高了铝-硅合金的耐蚀性.     

Evolution and effect on electrolysis performance of pores in YSZ electrolyte films prepared by screen-printing

Insights into the pore–matrix interactions in solid oxide electrolytes are necessary to develop high-efficiency solid oxide electrolytic cells. The role of particle size in ink and printed electrolyte films was analyzed in this study. This is distinct from solid electrolytes that are dense as a whole but have micropores. Herein, we demonstrate that the organic binder in the ink can significantly reduce the number of closed pores in the electrolyte by taking advantage of its thermal softening characteristics. Electron microscopic analysis provides evidence that the binder controls the pore generation and affects the pore distribution in the electrolyte films. The effect and mechanism of micropores in the electrolyte on the electrochemical process (when used for high-temperature steam electrolysis) are discussed.