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保护气体热处理是近代热处理的先进技术之一,它不仅广泛地应用在钢材的热处理上,而且也普遍应用于有色金属的热处理。铝和铝合金在干燥空气中热处理时,很少起氧化作用,所生成的氧化物极浅,表面几乎无变化。但是,铝经过抛光以后,再经过热处理时就会出现昙迹。有些气体成份对铝合金热处理是不适宜的,加100％的过热水蒸汽的气体会产生最坏的结果。含湿气的CO_2和N_2则无多大的变化。干燥的O_2和空气也无影响,但在
Shielding gas heat treatment is one of the advanced technologies in modern heat treatment. It is widely used not only in the heat treatment of steel but also in the heat treatment of non-ferrous metals. When aluminum and aluminum alloys are heat-treated in dry air, there is little oxidation and the resulting oxide is very light with almost no change in surface. However, aluminum after polishing, and then after the heat treatment will appear miracle track. Some gas components are not suitable for heat treatment of aluminum alloys. Adding 100% superheated steam gas will produce the worst result. Moisture-containing CO 2 and N 2 are not much changed. Dry O 2 and air also have no effect, but at