Galvanizing Myths and Facts

Galvanizing is a widely used method for protecting steel from corrosion, and with its popularity comes a number of myths and misconceptions.

In this month's Galvanizing Today article, we outline some of the most common galvanizing myths, and share the facts about this steel coating method.

Myth: Galvanizing is a new practice

Fact: Galvanizing was first developed in the early 19th century; the first patent for coating steel in molten zinc was formed in 1836. It has since become a cornerstone of corrosion protection technology. The longevity of galvanized structures around the world, many still in service after more than a century, demonstrates the proven reliability and effectiveness of the process. The galvanizing process continues to evolve with new innovations and applications.

Joseph Ash Galvanizing has been around nearly as long as hot dip galvanizing, forming all the way back in 1857.

Myth: Galvanizing is only for large structures

Fact: While galvanizing is commonly associated with large infrastructure like structural steel, it is equally effective for smaller components, such as nuts, bolts, fasteners and fixings.

However, the process needs to be adapted slightly to make it suitable for small steel pieces. A coating process known as spin galvanizing involves placing the steel into a basket first, before being centrifuged – or spun – at high speeds to remove the excess zinc.

Myth: Galvanized steel can’t be painted

Fact: Paint can be applied to galvanized steel, adding an extra layer of protection and enhancing its visuals. However, it does require the correct surface preparation and paint type. The smooth, shiny finish of freshly galvanized steel can resist paint adhesion, so proper surface treatment and the correct type of paint are needed for maximum effectiveness.

Galvanized steel is also suitable for powder coating, an alternative to paint that lasts longer. Galvanizing and powder coating used on the same fabrication is known as a duplex coating, providing an extended lifespan while leaving an aesthetically pleasing finish.

Myth: Galvanized steel can't be recycled

Fact: Galvanized steel is fully recyclable, without loss of properties. Both the hot dip galvanizing process and the galvanized product itself fit into the principles of a circular economy.

Plants at Joseph Ash Galvanizing have also been adapted to capture as many emissions as possible, reducing environmental impact. Our interactive animation shows exactly how we keep the process sustainable at every stage of the process.

Myth: Galvanized steel is more expensive in the long term

Fact: While initial cost of galvanizing can be higher than other protective coatings such as paint, it’s important to consider the long-term savings. Galvanized steel often requires little to no maintenance over the multiple decades it can last for, reducing the total lifetime cost of the upkeep. Additionally, its long life means fewer replacements, repairs, and disruptions, further contributing to cost savings.

The Galvanizer’s Association suggests that over a 25-year period, paint will cost 70% more than galvanizing. So even though it may seem more expensive at first glance, it is actually the cheaper option in the long term.

Did you believe any of these galvanizing myths? Let us know in the comments.