Why is galvanized steel such a durable material?

 

Zinc is used to protect steel from rust and corrosion - a process called galvanizing. Zinc galvanizing provides an impervious barrier between the steel and corrosive substances in the atmosphere: it protects the steel from moisture and corrosive chlorides and sulfides. In addition, the protective zinc coating will corrode before the steel, which is why this protection is described as sacrificial.

It is estimated that rust and corrosion cost society 5% of GDP each year. This is a major, and often, unnecessary burden. Zinc helps to avoid this economic burden. Buildings using galvanized steel need less maintenance and repairs, they last longer, and more valuable materials can be recovered upon demolition. Thus zinc lowers the resource consumption and life cycle costs of a building. Zinc makes steel more durable and thus a more sustainable material.

 

How long do zinc products last?

The life of zinc-containing products can range from 10–15 years for cars or household appliances, to over 100 years for zinc sheet used for roofing.