Yellowing of electrophoretic aluminium profiles: yellowing caused by poor conductivity of aluminium profiles during oxidation
If the contact between aluminum profile and conductive rod is not good, the resistance at the contact will increase greatly, the end of the profile will be heated, the oxidation film will be formed too fast and accompanied by burning phenomenon, and even the oxide film will be powdered. At this time, the oxide film is somewhat turbid, the color appears yellow, if electrophoresis production will appear very obvious yellowing phenomenon. This yellowing phenomenon usually has only a few branches in a row, and basically occurs at the end of the profile. Therefore, measures must be taken to ensure good contact between aluminum profiles and conductive poles.