Often, in the fence world, the term “galvanized” refers to fence materials that have received a protective zinc coating. Not all galvanizing methods are the same, though, so let’s explore the distinctions between electrogalvanized and hot dip galvanized fence materials.
What Is Galvanizing?
Galvanizing is the process of depositing a thin coating of zinc on steel in order to protect it from corrosion. This zinc coating is often called a “sacrificial” layer, because it is meant to wear away and protect the steel beneath from rust. Zinc also has a self-healing capability, so if the coating experiences minor damage, adjacent zinc can shift into the damaged area to shield the underlying steel.
What Is Hot Dip Galvanizing?
Hot dip galvanizing involves immersing the steel item in a bath of molten zinc. The result is a relatively thick coat of zinc, along with a thin steel/zinc alloy layer at the junction. This thicker zinc layer can appear textured or less smooth, but it offers stronger corrosion resistance compared to electrogalvanized alternatives.
Because hot dip galvanizing requires immersing items in large tanks, there can be size limitations. Larger components must fit the capacity of the molten zinc bath, so not every item can be conveniently processed this way.
In places like Phoenix, where intense sunlight and occasional monsoon rains can stress outdoor metalwork over time, hot dip galvanizing is often selected for robust protection. The thicker zinc layer tends to hold up well to both dry heat and sudden moisture.
What Is Electro-galvanizing?
Electro-galvanizing immerses steel in a zinc salt solution and then an electrical current prompts the zinc to electroplate the steel surface. The resulting zinc layer is thinner and smoother, which some might consider more appealing aesthetically. However, the thinner coating is less ideal for environments experiencing heavy moisture or corrosive elements.
For additional protection, it’s common to add a “duplex” coating on electrogalvanized fences, such as paint or powder coating. This second layer can help guard against rust where the zinc layer would otherwise be too thin to provide lasting defense.
What Else to Know About Electrogalvanized vs. Hot Dip Galvanized Fences
Because hot dip galvanizing applies a thicker coating and uses more zinc, materials generally cost more. Still, the trade-off is improved corrosion resistance, which can increase a fence’s life span. Investing in a thicker protective layer may be worthwhile for property owners who prefer long-term durability in climates with harsh sun or fluctuating humidity.
When requesting a new fence, it’s wise to specify the type of galvanizing. Asking only for “galvanized” could result in thinner electrogalvanized materials if that’s what a supplier normally stocks.
Western Fence Co. is a locally trusted resource for galvanized steel fences in Phoenix and across Arizona. Our team works to provide solutions that stand strong against the region’s temperatures and seasonal storms. If you’re looking for galvanized chain link or steel fence solutions, check out our Phoenix fence installation services.