铝材常温封孔质量影响因素的探讨

采用失重分析法检测了铝合金阳极氧化膜常温封孔的质量。讨论了封孔液中镍离子含量、氟化物含量、封孔添加剂含量、杂质离子以及封孔液的pH值、温度对封孔质量的影响。结果表明,封孔液中镍离子含量、氟化物含量、封孔添加剂含量是决定铝材封孔效果的关键性因素。经过实验得到铝合金阳极氧化膜常温封孔的适宜工艺条件为：5g／L Ni(AC)2,0．5～0.8g／LF^-,4．0g／L添加剂,温度30～35℃,时间10～20min,pH值5．5～6．5。     

【中国专利信息】

正一种常温微弧氧化膜封孔方法公开号102828216公开日2012.12.19申请人西南石油大学地址四川省成都市新都区新都大道8号本发明涉及一种常温微弧氧化膜封孔方法,采用硅酸钠、镍盐、溶剂与促进剂配制的溶液作为封孔剂,封孔剂静置至少2 h后在常温下对微弧氧化膜采用浸泡的方式进行封孔,封孔后封孔剂在微弧氧化膜表面的微孔中形成吸附结晶填充物而达到封孔     

镁-锂合金阳极氧化膜封孔工艺的研究

采用硅酸盐、硅溶胶、钛溶胶和稀土转化四种工艺对镁-锂合金阳极氧化膜进行封孔后处理.采用了扫描电镜、点滴实验和极化曲线测试分别对封孔前、后氧化膜的表面形貌和耐蚀性能进行表征.结果表明:经4种封孔工艺处理后的氧化膜表面形貌得到了不同程度的改善,耐蚀性能都比未封孔前有所提高;在质量分数为3.5%的NaCl腐蚀介质中,经稀土转化封孔后的氧化膜耐蚀性能最好.     

水质对铝合金阳极氧化封孔效果的影响

通过染色点滴试验和变褪色试验,探讨了反渗透(RO)水、自来水以及地下水3种不同水质对铝合金阳极氧化膜封孔质量的影响。结果表明,采用封孔剂对阳极氧化膜封孔时,其封孔效果不受水质的影响,提高封孔温度可提升封孔效果。水中硫酸根离子的存在会使封孔试样的变褪色级数降低,这种影响随硫酸根离子含量增大而加剧。     

热水和硅酸钠封孔法对镁合金磷化膜耐蚀性的影响

为了进一步提高镁合金磷化膜的耐蚀性,采用热水法和硅酸钠法对磷化膜进行了封孔处理。借助扫描电镜观察磷化膜的形貌并测试了其成分,通过动电位极化和交流阻抗等方法测试了磷化膜的耐蚀性。结果表明:两种封孔方法获得的磷化膜更加光滑,缺陷数量减少,且表现出更低的自腐蚀电流密度和更大的电荷转移电阻,特别是硅酸钠封孔后的磷化膜表现出更佳的耐蚀性。     

铝氧化膜常温封孔机理和时效特性

铝阳极氧化膜的常温封孔机理是溶解一沉积反应，其反应产物主要由水给Ｎｉ（ＯＨ）２，ＡｌＯＯＨ，ＡｌＦ３组成，是水解沉积，水化反应和形成化学转化膜的结果。提出了常温封孔模型，分析了常温封孔膜时效特性对封孔质量检查的影响，提供了两种加速时效熟化的措施。     

铝锂合金表面制备草酸阳极氧化膜及无铬封孔处理

为有效提高2099铝锂合金的耐腐蚀性能,在其表面制备草酸阳极氧化膜,并对氧化膜进行沸水封孔和镍盐封孔处理.表征与测试结果表明:草酸氧化膜完整覆盖了铝锂合金表面,且经过沸水封孔和镍盐封孔后氧化膜的微观形貌发生显著变化,镍盐封孔氧化膜较平整致密,孔隙率更低.沸水封孔和镍盐封孔对氧化膜的厚度基本没有影响,但是封孔后氧化膜的耐...     

不同封孔方法对汽车用2036铝合金草酸氧化膜性能的影响

选取汽车用2036铝合金作基体在草酸电解液中进行阳极氧化,并采用不同方法封孔,表征了封孔前后氧化膜的微观形貌、表面成分及耐腐蚀性能.结果表明,封孔后的氧化膜的微观形貌明显不同于未封孔氧化膜,封孔氧化膜的耐蚀性明显提高,但不同封孔工艺的氧化膜的耐蚀性存在一定差异,铬酸盐封孔氧化膜的耐蚀性优于热水封孔和镍-钴盐封孔的氧化膜...     

锆盐封孔对建筑铝合金阳极氧化膜耐蚀性能的影响

为了改善建筑常用6463铝合金的耐蚀性能,在其表面制备阳极氧化膜,然后采用氟锆酸钾溶液对阳极氧化膜进行封孔处理.研究了锆盐封孔对阳极氧化膜的微观形貌、表面成分和耐蚀性能的影响,并与沸水封孔和镍盐封孔进行了对比.结果表明:锆盐封孔对阳极氧化膜微观形貌的改善效果明显好于沸水封孔,阳极氧化膜中引入Zr元素,质量分数约为19....     

手机壳用铝合金二次氧化封孔剂的选择

分别选用进口封孔剂DX-500、国产封孔剂SF-558和AL-500A对阳极氧化后的A5052铝合金进行封孔。主要工序依次为冲压成型、抛光、除蜡、喷砂、一次氧化、一次封孔、激光导电位、CNC(计算机数控)高光、前处理、二次氧化和二次封孔。研究了封孔剂种类、质量浓度、使用温度和处理时间对氧化膜层外观、耐蚀性、耐变色性等性能的影响。对比分析了3种封孔剂的综合性能。较适宜的封孔工艺条件为:封孔剂质量浓度7 g/L,pH 5.5~5.6,温度高于80℃(一般取85℃),一次封孔时间20 min,二次封孔时间5 min。国产封孔剂SF-58和AL-500A完全可以替代进口封孔剂DX-500,其便宜且某些性能甚至超越进口封孔剂。     

Preparation and electrical properties of metal sulfides–amidoximated PAN composite film

To improve the electrical conductivity of polyacrylonitrile (PAN) film, metallic sulfides and PAN composite film were prepared by the chelating method. Dense PAN film and porous PAN film were prepared by dry process and wet process, respectively. These PAN films were treated to NH₂OH solution to introduce the amidoxime group coordinated with metallic ion. Cu⁺² and Cd⁺² ions were adsorbed to amidoximated PAN films, the sulfur ion was treated with metal-adsorbed PAN films, and thus CuS—and CdS–PAN composite films were prepared. The adsorptive capacity of amidoximated PAN film for the Cu⁺² ion was independent of the morphology of the PAN film, but the adsorptive capacity of the Cd⁺² ion on amidoximated PAN film was dependent on porosity of the polymer. Adsorptive capacity of amidoximated porous PAN film for Cd⁺² was improved about four times than that of amidoximated dense PAN film. The electrical conductivities of CuS–dense and porous PAN composite film were both 10^?1 S/cm in optimum condition, but because of the difference in adsorptive capacity, the electrical conductivities of CdS–dense and CdS–porous PAN composite films were 10^?9 S/cm and 10^?4 S/cm, respectively. Additionally, because CdS was known as a photoconductive material, the photoconductive properties of CdS–porous PAN composite film were investigated.     

聚硅酸氯化铝形貌结构研究

向聚硅酸中引入铝盐制得聚硅酸氯化铝复合絮凝剂,用电子显微镜观察分析了不同Al/Si摩尔比的PASC的形貌,考察了絮凝剂溶液的pH值、电导率随时间的变化,并用红外光谱研究了PASC中Al3 与聚硅酸的相互作用情况。结果表明,聚硅酸氯化铝的形貌均为枝杈状聚集态,并带有分形特征,完全不同于聚硅酸的球形或椭球形,也不同于聚铝的晶形;Al/Si摩尔比对形貌有较大影响。絮凝剂溶液的电导率、pH值随体系铝量、硅量及陈化时间的变化揭示了PASC絮凝剂体系中各成分间存在相互作用。红外光谱证实了PASC中部分Al3 及水解络合铝离子可与共存的聚硅酸起螯合(络合)反应生成铝硅聚合物。     

Mechanical factors in the adhesion of polyethylene to aluminium

The adhesion of low-density polyethylene to porous anodic films on aluminum was studied using the 180° peel test. Relative values of bond strengths, obtained by using polymer with and without antioxidant and by forming the bond in air or in vacuo, indicated that good adhesion could be obtained, despite previous evidence to the contrary, in conditions where oxidation of the polyethylene was suppressed. The relation between peel strength and anodic film thickness and film-forming voltage implied that the polyethylene entered pores in the film during bond formation. This was supported by the change of the category of the adhesion to one dependent upon polymer oxidation when the pores in the anodic film were sealed prior to bond formation. It is suggested that the mechanism of adhesion to porous anodic films on aluminum involves keying of the polymer into the pores in the film.     

铝合金导电氧化工艺

常规的铝阳极氧化膜由于表面电阻大而无法满足产品的电磁屏蔽性能要求。为提高铝氧化膜的电磁屏蔽性和耐蚀性，提出了一种铝合金导电氧化工艺。介绍了其原理、工艺流程及工艺维护，测量了所得膜层的外观、导电性和耐蚀性。结果表明，该工艺所得氧化膜无色透明、导电性好，且具有一定的耐蚀性。     

汽车用铝合金阳极氧化及双重封闭工艺的研究

对汽车用2024铝合金进行了硫酸阳极氧化处理,并使用硫酸镍结合铬酸钾的双重封闭技术对阳极氧化膜进行了封闭处理。结果表明:在2024铝合金表面制备的阳极氧化膜属于典型的多孔膜。经过硫酸镍一次封闭处理后,大量镍的氢氧化物填充于膜孔内,有效地降低了阳极氧化膜的自腐蚀电流密度。经过铬酸钾二次封闭处理后,铬酸镍进一步覆盖在膜孔表面,大大提高了阳极氧化膜的均匀性和致密性。经过双重封闭处理后,阳极氧化膜的阻抗明显增大,耐蚀性大大提高。     

Synthesis and Study of a Polypyrrole–Aluminum Oxide Nanocomposite Film on an Aluminum Surface

Using the method of electrochemical anodization, aluminum oxide porous films are obtained in a sulfuric acid solution. The morphology of the aluminum oxide surface is studied by the method of scanning electron microscopy. The high-quality elemental analysis of the initial and oxidized Al films is performed using the method of electron microprobe analysis. A protective composite polypyrrole-aluminum oxide film is produced on the aluminum surface on top of a porous aluminum oxide film in the galvanostatic oxidation mode by the electrochemical synthesis method. The properties of the polypyrrole–aluminum oxide composite film are studied by the methods of voltammetry, as well as impedance and FTIR spectroscopy.     

纳米阳极氧化铝模板膜孔可控生长规律

采用新的二次阳极氧化工艺,制备了多孔纳米阳极氧化铝(anodized Al2O3,AAO)膜.对铝在草酸溶液中的二次阳极氧化过程进行了研究.利用扫描电镜、原子力显微镜、透射电镜等对其形貌进行了表征和分析.结果表明:用高纯铝所制备的纳米AAO膜孔大小一致,有序性强;膜的孔径随扩孔时间的增加而增大,随草酸浓度的增加而减少.进一步延长扩孔时间至1.5h,其孔径生长规律仍符合AAO膜孔径可控性动力学模型方程,使原模型的扩孔时间范围由1.0h拓展到1.5h.AAO膜的最佳制备工艺为:采用0.3mol/L草酸溶液,电压为40V,在40℃氧化9h和扩孔1 h.在最佳制备工艺条件下,制备的AAO膜厚为112.7 μm,孔径为70nm左右.     

Properties of grafted polymer metal complexes as ion exchangers and its electrical conductivity

A polyelectrolyte has been prepared, as a potential proton exchange polymer, by grafting acrylic acid/acrylamide (AAc/AAm) and acrylic acid/acrylonitrile (AAc/AN) comonomers onto a low‐density polyethylene film via gamma irradiation. The developed polymers were characterized by evaluating their physico‐chemical properties such as ion exchange capacity (IEC) and electrical conductivity as functions of grafting yield. The grafted film at different compositions was characterized by Fourier transform infrared, thermogravimetric analysis, and scanning electron microscopy. IEC of the grafted film at grafting % 191 and monomer concentration ratio 50:50 for (LDPE‐g‐AAc/AAm) was found to be more than that for (LDPE‐g‐AAc/AN). The electrical conductivity was found to be greatly affected by the comonomer composition, were it increased as the degree of grafting increased for all grafted films. After alkaline treatment with 3% KOH (3% potassium hydroxide), the electrical conductivity of the grafted films found to be increased. The presence of potassium as counter ion maximized the electrical conductivity of the grafted films. The electrical conductivity of Cu‐membrane complexes was higher than that of both Co (cobalt) and Ni (Nickel) complexes. It has been indicated that, the electrical conductivity increased by increasing both Cu ion content and temperature. POLYM. ENG. SCI., 2013. © 2012 Society of Plastics Engineers.     

Preparation of conducting polymer composites: effects of porosity on electrical conductivity

To prepare conducting polymer composites, porous polymethyl methacrylate (PMMA) particles with different specific surface areas were prepared by seeded emulsion polymerization and solvent extraction. The dried porous particles were imbibed with the oxidant solution and adsorbed pyrrole from a solution. The incorporation of pyrrole into the porous particles was achieved by chemical oxidative polymerization. The effects of various polymerization parameters on the electrical conductivity were systematically investigated. The important factors affecting conductivity were the porosity of the host polymer particles and the solvent polarizability. © 1998 SCI.     

铝阳极氧化膜采用复合无镍封孔工艺的研究

通过分析锂盐与锆盐两种无镍封孔工艺各自对铝阳极氧化膜封孔所存在的优缺点,提出了一种二步法──复合无镍封孔工艺,即第1步用锂盐对铝阳极氧化膜进行封孔,第2步再用锆盐对相同铝阳极氧化膜进行复合封孔,从而既克服了锆盐和锂盐1步法封孔工艺存在的缺点,又保留了各自的优点,使工艺的适应性得到一定改善,使铝阳极氧化膜综合封闭孔质量及重要性能得到较大提高。