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清华大学核能研究院屏蔽实验反应堆池壳用A0纯铝制成,并于1964年对池壳进行了全部阳极氧化处理。至2001年,反应堆运行了37年,池壳表面仍然有一层发亮的氧化膜,与国内外同类型的未经阳极氧化处理的反应堆相比较,说明氧化膜极好地保护了池壳。该反应堆池壳容积大于50 m3。表面积达100 m2,把这样大的铝制设备在完全安装完毕后进行全部表面阳极氧化处理,在处理工艺上是很困难的。本文阐明了解决这些问题的方法。对A0纯铝在草酸中的阳极氧化做了许多实验,获得了A0纯铝在3%(w/%)草酸中的阳极氧化的基本规律,并确定了最终的工艺参数。包括氧化电流密度,氧化时间和电解液的温度。在铝池壳的阳极氧化过程中解决了许多关键的工艺:如大型工件阳极氧化工艺、氧化机制、性能;分层处理与薄膜密封技术;电源的选择;电解液的循环冷却;氧化膜的质量检测等。
Tsinghua University Institute of Nuclear shielding experimental reactor pool shell made of A0 pure aluminum, and in 1964 on the tank shell was all anodized. By 2001, the reactor had been in operation for 37 years and the surface of the shell was still covered with a shiny oxide film. Compared with the same type of unanodized reactor at home and abroad, the oxide film protected the shell very well. The reactor tank volume is more than 50 m3. With a surface area of 100 m2, it is difficult to handle the entire surface anodized with such a large aluminum unit after it has been completely installed. This article illustrates ways to solve these problems. A number of experiments were conducted on the anodization of A0 pure aluminum in oxalic acid. The basic rules of anodization of A0 pure aluminum in 3% (w /%) oxalic acid were obtained and the final process parameters were determined. Including oxidation current density, oxidation time and electrolyte temperature. Many key processes have been solved during the anodization of aluminum cells: anodization of large workpieces, oxidation mechanisms, properties, stratification and membrane sealing technology, choice of power supply, circulation cooling of electrolyte, quality of oxide film Testing and so on.