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一、前言铝及其合金的铬酸盐转化膜的方法最早是在1950年提出的。由于这种膜有极高的防腐蚀能力和简单的操作工艺,并不需特殊设备,经济性好,决定了这一工艺的广泛应用,且有可能取代阳极氧化工艺。该膜十分薄,一般在0.25μm左右,而且转化液对基本金属的腐蚀能力极弱,所以用这种方法并不象阳极氧化、化学氧化等那样要改变工件尺寸。铝及其合金的铬酸盐膜有极好的耐盐雾试验性能。我们在研究中发现,其防护性能
I. INTRODUCTION The method of chromate conversion of aluminum and its alloys was first proposed in 1950. Because of this film has a high anti-corrosion ability and simple operation process, and does not require special equipment, good economy, determines the wide application of this process, and may replace the anodizing process. The film is very thin, generally about 0.25μm, and the conversion of the basic metal corrosion resistance is very weak, so this method is not like anodic oxidation, chemical oxidation, as to change the size of the workpiece. Chromate films of aluminum and its alloys have excellent salt spray resistance properties. We found in the study, its protective properties