The Essential Process of Hot Dip Galvanizing

The effective process of hot dip galvanizing is one of many used to prevent corrosion of steel and iron and is a fairly simple but incredibly durable option.

Data shows that one of the main benefits of hot dip galvanization is its longevity with corrosive protection lasting between 34 and 170 years, depending on the environment. 

In addition, it is a cheaper option than stainless steel and is one of the more environmentally friendly anti-corrosion methods.

The process of hot dip galvanizing

To ensure a long-lasting result, careful attention is paid to preparing the metal. 

Each piece will need to go through a thorough chemical cleaning process which removes any residual mill scale, oil, or impurities. Degreasing will generally occur first using an acid solution and then rinsed off. Following this, the component is dipped in hydrochloric acid which removes any remaining impurities, rust, or scale. 

The galvanizing process can begin once all the cleaning products have been thoroughly rinsed off; the required reaction will only occur on a metal surface that is chemically clean. 

Fluxing is a process commonly used prior to galvanizing where the product is coated with a saline layer which facilitates a strong bond between the iron or steel and the zinc.

The metal is then immersed in a bath of molten zinc which has been heated to around 450˚C. During this procedure, the zinc bonds to the steel and forms a robust and impenetrable coating. 

Why is zinc the coating of choice? 

Zinc corrodes significantly slower than steel and iron and therefore serves as a protective coating for the underlying metal. It is, in essence, a sacrificial coating and provides a self-repairing layer to the steel. Hence its longevity and popularity in the metal industry.

Chat with the team at Steelmor for more information on the production of top-quality metal products.