However, if the galvanized item is situated on a cliff face in a coastal region with frequent and high levels of rainfall, this life will be significantly reduced. Supplementary treatments such as painting will help to extend the products life.
Hot dip galvanizing is the process whereby metal is immersed into a bath of molten zinc at a temperate of 450 °C (842 °F) to give the material a thick, robust outer layer of zinc alloys. On occasion, where an additional coat is required e.g. it is painted at a later stage, the zinc coating will be thinner to ease the application of the additional coating. Once the material is removed from the bath (5 minutes is usually sufficient to provide the required coating), it is then quenched in water or air cooled to allow handling.
For the galvanization of threads, see the threading page.