Chemical conductive oxidation of aluminum products

Chemical conductive oxidation can be divided into silver white conductive oxidation and colored conductive oxidation in terms of color, the latter can be further divided into earthy yellow, rainbow color, and golden yellow conductive oxidation.
1. The oxide film is colorless and transparent, with a thin film thickness of about 0.3-0.5 μ m. It has good conductivity and is mainly used for deformed aluminum electrical components.
2. The film layer is about 0.5 μ m thick, colorless to rainbow or dark brown, with good corrosion resistance and few pores. It is applied to larger components or assemblies that are not suitable for anodizing.
3. The oxide film is golden and rainbow colored, with good corrosion resistance, and is suitable for local oxidation of aluminum alloy welding parts.
4. The oxide film is rainbow colored and thin, with better conductivity than formula 2, making it suitable for parts that require a certain degree of conductivity.
5. After chemical conductive oxidation, the film layer needs to be filled with post-treatment. The post-treatment formula is: 30-50g/L K2Cr2O7 (or Na2Cr2O7) (CP grade); 90-95 ℃, 5-10 minutes. It is usually used as the bottom layer in spray painting or electrophoretic painting processes.
6. Only reduce the NaF content, and the appearance of the film layer will change from rainbow color to golden yellow. Increase the NaF content, reduce the potassium ferrocyanide content, shorten the oxidation time, and the appearance of the film layer will be earthy yellow, no longer rainbow color.