How long has the hot-dip galvanizing process been used?
Using zinc to protect steel from corrosion (hot-dip galvanizing) is a 150-year-old practice! ASTM specification A123 / A123 M-02, Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products and A153 / A153 M-03, Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware detail how the process is done today.