Galvanised Heating Cooling Duct Joiner Ducting Connector Joiner Air 6 to 16 inch Galvanised- Never Rust Galvanization or galvanizing (also spelled galvanisation or galvanising) is the process of applying a protective zinc coating to steel or iron, to prevent rusting. The most common method is hot-dip galvanizing, in which the parts are coated by submerging them in a bath of hot, molten zinc.