When it comes to working with galvanised steel, rust formation can be a serious concern, especially when the steel is being used for structural support or a structural application. Rust formation can weaken the steel and may indicate potential weaknesses in the steel’s structural integrity. A common cause of rust formation in galvanised steel is when proper care isn’t taken to restore the protective coating after cutting galvanised steel. In this post, we take a closer look at how exactly cutting or drilling can lead to rust formation in galvanised steel.
Why Does Rust Form After Cutting or Drilling?
Galvanised steel is characterised by a coating of zinc on its outer surface that is generally not reactive and which prevents the underlying steel from coming into direct contact with air and moisture. However, this protection can be diminished if the coating is compromised or if there are gaps in the coating.
Cutting and drilling galvanised steel can lead to the formation of rust because these processes can cause the protective coating to become damaged or removed entirely at the exposed edges or holes. Once the underlying steel is exposed, it is no longer protected from environmental elements such as air and moisture. This then leads to the oxidation process, which causes rust to form. If left unaddressed, rust can spread from these vulnerable points and compromise the integrity and appearance of the rest of the steel.
How to Prevent Rust Formation After Cutting or Drilling
There are several ways that you can prevent rust formation after cutting or drilling galvanised steel:
Touching Up with Zinc
Perhaps the most common and popular way of preventing rust formation after cutting and drilling is to touch up the affected area with a zinc-rich galvanising spray or paint. This will help restore the protective layer and provide long-term protection from the elements.
Painting and Sealing
Alternatively, you can also opt to paint and seal the exposed steel surface using paints that are designed to prevent rust. This method provides a physical barrier that protects the bare metal from moisture and oxygen. While it doesn’t offer the samel level of protection as zinc-rich coatings, it can be effective in low-corrosion environments or for temporary applications. It is also important to choose paints specifically formulated for use on metal and to apply them according to the manufacturer’s instructions for maximum durability.
Get High Quality Galvanised Steel from RW Steel
RW Steel is the number one supplier of high quality galvanised steel and other steel products in Melbourne and the surrounding areas. We have an extensive catalogue that you can choose from, ranging from galvanised steel posts and steel retaining wall posts to 150uc steel and 100PFC steel. To find out more about how we can help with all of your steel needs, leave us a message today and one of our experts will be in touch with you!