The purpose of galvanizing is to create a protective coating of zinc on steel or iron parts. But why is this useful? What are the main advantages of galvanizing? 1. Stops corrosive substances: The zinc coating on the galvanized metal stops corrosive substances from reaching the weaker underlying substrate metal. This can extend the life of the substrate, especially in demanding applications. 2. Prevents rust: Galvanizing significantly delays rust. Creates a sacrificial anode: The zinc coating is consumed by corrosive substances, so it provides protection to the metal underneath until it is completely used up. Even if a scratch penetrates the coating, the zinc will be used up before the iron. 3. Long-lasting: The zinc coating formed by galvanizing is tough and long-lasting, often providing decades of protection to the underlying metal. 4. Creates a thick coating: Although not suitable for all applications, galvanizing produces a thicker coating than, for example, electroplating.