Aluminum alloy profiles have high strength, light weight, strong stability, strong corrosion resistance, good plasticity, small deformation, pollution-free, non-toxic, strong fire resistance, long service life (up to 50-100 years), good recovery, and can be refining. Over the years, 6063 Aluminium Alloys (nearly 100 kinds of aluminium alloys) have been used as door and window frames in the world. The main reason is that the metal surface has good anodic oxidation effect. The anodic oxidation is white at first, and then the electrolyte is further changed to reach the bronze color. These two main colors have been used in China for more than ten years. Ten years ago, Changzhou, Jiangsu Province, introduced the technology of aluminium surface powder spraying, which can be sprayed with various colors. But at that time, the domestic economy was not allowed, and the market did not recognize the colorful doors and windows, which was ugly. With the rapid development of domestic economy, people's aesthetic views have also changed. Now people think that the color of white and bronze doors and windows aluminum is monotonous and not rich and colorful, and then require a variety of colors, such as green, yellow, red, blue, etc. Only green can be divided into six kinds.
