1,Anode aluminum die-casting products are the most widely used and successful technology, and also the most in-depth and comprehensive technology researched and developed. The anodized aluminum film has a series of superior properties and can meet a variety of needs, so it is called a universal exterior protective film. the film layer has the characteristics of wear resistance, corrosion resistance, sun fast and not easy to fade. No chemical reaction with organic reagents. 2,Aluminum anode principle: aluminum and its alloy in the corresponding electrolyte and maintained process conditions, due to the action of external current, the process of forming a layer of oxide film on aluminum products. 3. At present, the anodizing of aluminum parts is divided into two categories: first, materials containing copper and silicon are very high, such as ZL111 gravity casting materials and ADC12 pressure casting materials, in order to ensure the flow performance of the alloy, the silicon content is generally above 3% 。