Galvanised pipes are made by taking steel or iron pipes and coating them with a protective layer of zinc to prevent rust and corrosion. The most common method is hot-dip galvanisation, where the pipes are first cleaned to remove oil, dirt, and rust, then dipped into a bath of molten zinc calculadora alicia. This process allows the zinc to bond tightly to the metal surface, forming a durable, corrosion-resistant coating.