With a zinc coating, you can protect metals from corrosion for decades.
Hot dip galvanizing involves dipping pre-treated metal parts into 450 °C zinc. As soon as the parts are exposed to air after this, a weatherproof and extremely durable alloy of zinc oxide and zinc carbonate forms on their surfaces, protecting the underlying more precious metals (e.g. iron or steel) from corrosion.
With a proportionally thicker zinc layer metals can be protected from corrosion for decades, even under the corrosive stress of category C4, thus extending the maintenance intervals and reducing costs.
The application of a duplex system (galvanization + coating) can further extend the duration of the protection.