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作为防蚀性的金属——铝,已被广泛采用。其用途之一,是代替铅来制造锌的电析槽的冷却器。这个代替以后不仅能使电解液很好地冷却,而且能够防止在金属表面上生成不易溶解的钙鹽,这种情况以前在铅上曾经发生过。由于铝制冷却器的使用期间还比较短,所以有专门研究这个问题的必要。从文献资料中可以确定,铝能够在许侵蚀性介质裡面保持不受侵蚀,因为这些介质能够在铝的表面上促使保护膜的生成。同时,它的化学破坏速度跟氧化剂介质的特性、温度、和溶液的浓度等等之间的关系,是十分复杂的。例如,在温度20℃时,于各种不同浓度的硫酸溶液
As corrosion-resistant metal - aluminum, has been widely used. One of its uses is to replace the lead to make the zinc cooler electrolytic cell. This replacement not only allowed the electrolyte to cool well, but also prevented the formation of less soluble calcium salts on the metal surface, a situation that had previously occurred on lead. As the use of aluminum cooler is still relatively short period of time, so there is a special need to study this issue. From the literature, it is clear that aluminum can remain unetched in aggressive media as these media promote the formation of protective films on the aluminum surface. At the same time, its rate of chemical destruction depends on the nature of the oxidizer medium, the temperature, the concentration of the solution, and so on. For example, at a temperature of 20 ° C, in various concentrations of sulfuric acid solution