Galvanised steel is a unique type of steel that has been coated with a layer of zinc to protect it from the elements. However, because of this, the surface properties of galvanised steel may differ significantly from those of other types of steel, such as carbon or stainless steel. Certain chemicals may also not be suitable for use with galvanised steel as they may cause damage to the steel’s protective layer. In this post, we take a closer look at what chemicals you should avoid around galvanised steel so that you can maximise its lifespan.
Common Chemicals That Can Damage Galvanised Steel
Some of the most common chemicals that can damage galvanised steel include:
Strong Acids
Strong acids such as hydrochloric acid, sulfuric acid and nitric acid can be dangerous to use around galvanised steel as they can cause a rapid breakdown of the zinc protective layer on the surface of the galvanised steel. This is because zinc is highly reactive to acidic substances and will dissolve when exposed to acid, leaving the underlying steel susceptible to rust and structural degradation. These acids and the industrial chemicals and acidic cleaners that they are commonly found in should therefore be kept away from any galvanised steel. Any accidental exposure should also be cleaned and neutralised immediately.
Strong Alkalis
Strong alkalis can also cause zinc to dissolve, compromising the protective coating on the surface of the steel. These can usually be found in industrial cleaners, degreasers, drain cleaners and certain cleaning solutions that are designed for heavy-duty applications. Because of how common they are, it is important to check the contents of any cleaning solution that you are using on galvanised steel to ensure that it is free from potentially harmful substances. At the same time, you should also opt for pH-neutral or zinc-safe cleaning products where possible for greater peace of mind.
Chlorine-Based Products
Chlorine-based products or products that contain chlorides, such as bleach, pool chemicals and de-icing salts, can also be highly damaging to galvanised steel. These substances can lead to the formation of zinc chlorides, which can break down the zinc coating and lead to pitting, staining and accelerated rusting. To prevent this from happening, you may also consider applying a further protective coating to any galvanised surfaces that might be exposed to chlorides, such as those near pools or in coastal environments.
The Importance of Using High Quality Galvanised Steel
Apart from ensuring that you avoid using chemicals that can damage galvanised steel around it, it is also important to ensure you are using high-quality galvanised steel if you want to maximise the strength and lifespan of your steel structures. RW Steel is the number one supplier of steel in Melbourne, and we offer a wide selection of galvanised steel sections to meet your needs, ranging from galvanised H channel steel posts to galvanised steel retaining wall posts. Get a free, no-obligation quote for all of your steel needs from our website today!