Aluminum and aluminum products processing conditions after chemical oxidation of aluminum alloy passivation and passivation liquid formulations are shown in Table 4.37. Table 1 is applied to acidic formulations chemical oxidation, Formulation 2 is suitable for alkaline chemical oxidation. Closing the oxide film is actually closed micro L larvae oxide film, reduce the surface activity, it is also known sealing treatment. Closed methods of aluminum and aluminum anodized many, can be divided into the following methods, CNC lathes machining, aluminum products, aluminum products degreasing before processing, stainless steel CNC turning, most factories still use the weak base chemistry degreasing degreasing washed or caustic soda, but in recent years, an increasing number of plants using methods to add a surfactant degreasing. The use of surfactants unique physical and chemical properties, reduced surface tension, emulsifying, solubilizing and foaming itself alkali, hard water have a good chemical stability effect to improve the purification effect degreasing, and alkaline surface layer foam layer, CNC machining precision metal drones, inhibiting alkali mist to escape, reducing pollution, processing, improve operating conditions. Factory aluminum products such as Tianjin, Tianjin or Shanghai description synthetic detergent production plant AS anionic surfactant Lvpen washed, received better economic results. The specific process is: caustic soda (NaOH) 10%; temperature 97 ~ 100 ℃; 5 ~ 7 seconds. AS surfactant added is about 0.2 g / liter, as the case may increase or decrease. Stainless steel CNC turning | Hong Run (Online) | processing provided by Hongrun Dongguan Shijie Hardware Products Factory. Hongrun Dongguan Shijie Hardware Products Factory (dghrwj1688.1688.com) is Dongguan, hardware accessories leader over the years, the company implement the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In Hongrun leadership with the staff warmly welcome all inquiries negotiations to create a better future for Hong Run.