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铝和铝合金除了作为装饰性的材料外,已经越来越广泛地应用在建筑、汽车、火车、飞机、各种器械设备等多个方面,化工设备也用到铝和铝合金。铝是一种活泼金属,它的耐蚀性能归功于它的“钝化”,也就是在铝表面形成的氧化膜层。铝材和铝制设备的寿命,很大程度上决定于这层氧化膜的质量。 1、铝氧化膜的结构和性质在不同的条件下,铝表面所形成的氧化膜是不同的。在大气中的金属铝,表面形成的氧化膜层很薄,有些时候不能满足工程上的要求。铝在它的氧化物溶解量低的溶液(例如
In addition to being a decorative material, aluminum and aluminum alloys have been used more and more widely in construction, automobiles, trains, airplanes and various equipment and equipment. Chemical equipment also uses aluminum and aluminum alloys. Aluminum is a living metal, its corrosion resistance due to its “passivation”, which is formed on the surface of the aluminum oxide film. The life of aluminum and aluminum equipment, largely determined by the quality of this layer of oxide film. 1, the structure and properties of aluminum oxide film Under different conditions, the oxide film formed by the aluminum surface is different. Metallic aluminum in the atmosphere, the surface of the oxide film is thin, and sometimes can not meet the engineering requirements. Aluminum is dissolved in a low amount of its oxide solution (for example