Hot dip galvanizing is one of the most effective and durable ways to protect steel from rust and other forms of corrosion.
Hot-dip galvanizing is a process of coating steel with a layer of zinc to protect it from corrosion. The steel parts to be protected are submerged into a molten zinc bath at a temperature of approximately 850°F (450°C). The zinc reacts with the iron in the steel to form a metallurgically bonded zinc coating. This coating is resistant to corrosion and can last for many years, even in harsh environments.
How it works #
Zinc is more anodic than steel, which means that it is more likely to corrode. When zinc and steel are in contact and exposed to an electrolyte (such as water or salt water), a corrosion cell forms. In this corrosion cell, the zinc corrodes instead of the steel, protecting the steel from corrosion. This is called sacrificial protection.
Zinc metal is very dense and thus does not allow moisture, or electrolytes, to penetrate the galvanized coating. Therefore, the base steel does not corrode.
The zinc will continue to protect the steel until all of the zinc has corroded. Once all of the zinc has corroded, the steel will begin to corrode.
Learn more about G.I. coating thickness and protection lifespan
Benefits of hot dip galvanizing #
Hot dip galvanizing offers a number of benefits, including:
- Corrosion protection: Hot dip galvanizing provides excellent corrosion protection for steel. The zinc coating protects the steel from rust, other forms of corrosion, and weathering.
- Long lifespan: Hot dip galvanized steel has a long lifespan, typically lasting for 20-30 years. This can be even longer in less corrosive environments.
- Low maintenance: Hot dip galvanized steel requires very little maintenance. Once it is galvanized, it does not need to be painted or coated.
- Durability: Hot dip galvanized steel is very durable and can withstand harsh environments. It is resistant to impact, abrasion, and chemicals.
- Sustainability: Hot dip galvanizing is a sustainable process. The zinc coating can be recycled at the end of its life.
