一引言铝及其合金具有较高的机械强度,优良的导热性及导电性,良好的反射性,无磁性,比重小,腐蚀产物无毒等优良性能,所以它们被广泛地用于工、农业及军事等方面。但铝及其合金具有很大的氧化倾向而使金属表面失去光泽。为了提高铝及其合金的抗蚀、耐磨、绝缘等性能,同时考虑到装饰效果,阳极氧化及着色已越来越广泛地被人们所采用。铝及其合金的阳极氧化方法至今已有六十多年的历史,但电解着色还是近二十年来的 I. INTRODUCTION Aluminum and its alloys are widely used in industry and agriculture because of their high mechanical strength, good thermal and electrical conductivity, good reflectivity, non-magnetic properties, small specific gravity and non-toxic corrosion products. And military and so on. However, aluminum and its alloys have a great tendency to oxidize and cause the metal surface to lose its luster. In order to improve the corrosion resistance, abrasion resistance and insulation properties of aluminum and its alloys, anodic oxidation and coloring have been adopted more and more widely by people considering the decorative effect. Anodic oxidation of aluminum and its alloys has been more than sixty years old, but electrolytic coloring is still nearly two decades