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...     

铝及铝合金阳极氧化膜封孔技术机理、应用及研究进展

阐述了铝及铝合金阳极氧化膜封孔的机理,总结了沸水封孔、蒸汽封孔、铬酸盐封孔、氟化镍常(低)温封孔和醋酸镍中高温封孔的技术特点。介绍了国内外无镍封孔技术(包括微波水合封孔、溶胶-凝胶封孔、有机酸封孔、稀土盐封孔及无镍金属盐封孔)的研究进展,并展望了封孔技术未来的研究方向,认为新型绿色封孔技术和复合封孔技术将是未来发展的趋势。     

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....     

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...     

铝锂合金混合酸阳极氧化及无铬封闭研究

为有效提高铝锂合金的耐蚀性能,采用混合酸电解液(硫酸与柠檬酸的混合溶液)进行阳极氧化,然后对阳极氧化膜进行无铬封闭处理,并对阳极氧化膜的微观形貌、表面成分、厚度和耐蚀性能进行了分析表征。结果表明:混合酸阳极氧化后铝锂合金表面形成了均匀多孔的阳极氧化膜,主要含有Al、S和O元素,厚度为12.8μm,其耐蚀性能好于铝锂合金。沸水封闭、锆盐封闭、镍盐封闭和铈盐封闭对阳极氧化膜的厚度几乎没有影响,但封闭后阳极氧化膜表面平整度和致密性改善,耐蚀性能明显提高。铈盐封闭过程中同时生成水合氧化铝、铈氢氧化物和铈氧化物,更好的填充覆盖了孔洞,封闭效果好于沸水封闭、锆盐封闭和镍盐封闭,因此铈盐封闭阳极氧化膜表面更平整致密,抵御腐蚀能力增强,电荷转移电阻较铝锂合金提高了超过一个数量级,腐蚀失重仅为铝锂合金的1/9,可以显著提高铝锂合金的耐蚀性能。     

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。     

铝及铝合金阳极氧化膜封孔质量无铬检验方法的研究

分别采用磷酸法、硫酸法、乙酸-乙酸钠法和酸化亚硫酸钠法对经过不同封孔工艺(包括沸水封孔、镍基常温封孔、镍基中温封孔和硝酸铈封孔)处理的6063-T5铝合金板硫酸阳极氧化膜的封孔质量进行检测,并与硝酸预浸磷铬酸法进行了对比分析。结果表明,磷酸法与硝酸预浸磷铬酸法的检测结果具有良好的对应关系。在4种无铬检测方法中,磷酸法最适合替代硝酸预浸磷铬酸法,可用于铝及铝合金阳极氧化膜封孔质量的无铬检测。与硝酸预浸磷铬酸法相比,磷酸法缺少了缓蚀剂铬酸,所以其测试结果略高于硝酸预浸磷铬酸法。采用磷酸法评价封孔质量时,其评价指标要比硝酸预浸磷铬酸法约偏高5 mg/dm2。由于磷酸对铝基体具有腐蚀性,裸露铝基体面积的大小会影响测试结果的准确性,所以采用磷酸法检测时,应先将裸露的铝基体封闭后再进行试验。     

铝材阳极氧化膜的封孔工艺

正0前言本文提供了一种用于提高铝材阳极氧化膜耐碱性及耐蚀性的封孔工艺。该工艺突破了现有单步或两步封孔工艺的瓶颈,采用多步法进行封孔处理,并引入钝化工艺作为中间封孔,可显著提高铝材的耐蚀性。1工艺内容1.1阳极氧化工件经脱脂、水洗、抛光、去膜、水洗、除灰后,置于质量浓度为(190±10)g/L的硫酸溶液中进行阳极氧化处理(通电30 min,电流密度为1A/dm2),之后用水清洗干净。     

无镍封孔剂对铝阳极染色封孔效果的影响

探讨了使用不含镍与含镍的封孔剂在铝阳极染色与封孔上的差异性.结果表明,无镍封孔剂与含镍封孔剂皆可有效封孔,但使用无镍封孔剂不仅可以更有效地减轻流色问题,而且更环保.     

阳极氧化化学染色膜封孔工艺的研究

降低ZHM无镍封孔剂的体积分数可以改善封孔时的流色现象。ZHM无镍封孔剂的体积分数为0.8~1.0mL/L时,最适合染色膜封孔,流色情况接近日本无镍封孔剂的水平,但封孔质量比日本无镍封孔剂的好。ZHM有镍封孔工艺在流色情况与封孔质量方面都与日本有镍封孔工艺相当,且与原色的色差小。兑稀有镍添加剂后,流色情况无改善。不考虑环保要求,有镍封孔工艺更适合阳极氧化化学染色膜封孔。     

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。     

Alkaline Corrosion Resistance of Anodized Aluminum Coated with Zirconium Oxide by a Sol-Gel Process

To improve the alkaline corrosion resistance of aluminum, composite films were prepared that consisted of a porous layer of anodically grown aluminum oxide filled with zirconium oxide, with a zirconium oxide coating layer that was deposited thereon via the sol—gel process, using a dip-coating technique. The alkaline corrosion resistance of these composite films was extremely improved when this coating layer was placed on an anodic oxide film. Comparisons of the composite film and conventional anodic oxide film showed that the alkaline corrosion resistance of the composite film was increased by a factor of 24–50. Because these composite films, which have high corrosion resistance, indicated a vibration phenomenon of voltage in the duration time curve of the electromotive force measurement, the composite film had a self-repairing action for alkaline corrosion.     

双重封闭对建筑用6463铝合金酒石酸氧化膜耐蚀性能的影响

为提高建筑用6463铝合金的耐蚀性能,在6463铝合金表面制备酒石酸氧化膜,然后进行热水-镍盐双重封闭.研究了双重封闭对酒石酸氧化膜的形貌、厚度及耐蚀性能的影响,并与单一热水封闭、镍盐封闭作比较.结果表明:单一封闭和双重封闭对酒石酸氧化膜的厚度基本没有影响,但封闭前后酒石酸氧化膜的形貌、成分及耐蚀性能存在差异.双重封闭...     

不对称正负脉冲电流铝阳极氧化研究

将不对称正负脉冲电流应用于铝的普通阳极氧化，研究了不对称脉冲电流氧化参数(正脉冲电流、负脉冲电流、周期比和频率)对铝阳极氧化过程和氧化膜性能的影响。结果表明，在合适的电解参数下采用不对称脉冲电流对铝进行阳极氧化，具有成膜速度快、膜层硬度高等特点。     

Micro-patterning in anodic oxide film on aluminium by laser irradiation

Microstructures such as microchannels and microchambers were fabricated on anodic oxide film of aluminium with laser direct patterning technique. The aluminium substrate covered with porous type anodic oxide film was dyed with organic dyes followed by hydrothermal treatment. The coloured and pore sealed film shows much higher absorption then as-formed porous film, that makes possible to pattern various types of microstructures on the film by removing the upper part of the film surface by laser irradiation. Structure of the crystallized hydroxide layer on the surface of the anodic oxide film, formed during pore sealing, as well as the partial removal of anodic oxide film from the surface is described. Microstructures with depth lower than 1-27 μm were patterned successfully on 16 and 32 μm thick anodic oxide film surfaces, using various combinations of laser power and laser scanning speed. The affect of the laser scanning speed and laser power density on the shape of the microstructures is also explained.     

A model for the mechanism of nickel fluoride cold sealing of anodized aluminium

The sealing of porous anodic oxide films on aluminium by the use of nickel fluoride solutions at ambient temperatures has been proposed as an alternative to hydrothermal sealing methods, on energy grounds. The process of cold sealing shows some promise and a mechanism is proposed as to how it may operate. As fluoride ions enter the pores, a place exchange mechanism occurs causing a shift in the local pH which is sufficient to cause nickel ions to precipitate. The nickel hydroxide blocks the pore mouths, effectively sealing the film. A slow step then occurs whereby water from the atmosphere diffuses into the film, effectively hydrating the film and causing general pore blocking. This slow step explains the ageing effect seen with such films. Eventually a film is produced which is effectively sealed.     

Small molecule delivery using carbon nano-test-tubes

A dye, as a model for small molecular drug, was inserted into carbon nano test tubes (35 nm in diameter, 4.5 μm in length) synthesized using nanochannels of an anodic aluminum oxide film as a template, and the open mouths of the test tubes were sealed by polystyrene polymer. The resulting test tubes are dispersible in water, and the dye remains in the cavities because of the sealing. When the polymer-plug was dissolved by putting the test tubes into good solvents for polystyrene, the dye diffused out from the tube cavities. This study demonstrated the potential use of the test tubes as nano-sized carriers for drug and gene delivery.     

铝合金氧化膜的铝溶胶封孔工艺研究

用铝溶胶对铝合金阳极氧化膜进行封孔处理是无铬、无氟并且无重金属的绿色环保新技术.通过双因素的方差分析和极差分析研究了异丙醇铝溶胶封闭膜耐酸性溶液腐蚀、耐盐雾和封闭膜的染色性能.通过正交试验研究了硝酸铝溶胶的染色性和耐酸性点滴液腐蚀的性能.试验在室温下,用低浓度且pH小于5的能稳定保存的两种铝溶胶进行的,封闭后膜层未经水...     

稀土元素在铝合金阳极氧化后处理中的应用

研究了将稀土盐（如铈盐）用于铝合金阳极氧化后处理，测量了氧化膜在酸、碱介质中的耐蚀性。结果表明，经铈盐处理后，铝氧化膜的耐酸性明显提高，优于常温封闭处理，耐碱性却降低。这可能是由于氧化膜孔中的稀土化合物在碱性介质中优先溶解。     

卤水提锂吸附剂应用研究进展

利用吸附剂从卤水中提锂是目前最具发展潜力的提锂方式。综述了层状吸附剂、锑酸盐吸附剂、铝基吸附剂和离子筛型氧化物吸附剂的吸附机理、制备方法、吸附性能,并对比了各自的优缺点。指出吸附剂中以铝基吸附剂和离子筛型氧化物吸附剂的优势最为明显,但是都存在成粉末状、流动性及渗透性差、溶损率较高等缺点。因此,如何造粒以及如何降低溶损率将成为吸附法盐湖提锂技术的发展方向。