Approximately 30-40 years later, the zinc carbonate begins to break down and the corrosion process begins.Zinc carbonate can be painted but doesn’t necessarily need to be. After approximately 12 to 18 months, a zinc carbonate forms, which provides a barrier coating that protects the steel.Then, once humidity or any moisture is introduced, the zinc oxide converts to zinc hydroxide.Almost immediately, that zinc oxidizes, becoming zinc oxide.New galvanized steel has a pure film of zinc on the substrate.At this time, painting is an effective way to reduce corrosion and/or slow down the corrosion process. Once corrosion starts, it accelerates rapidly. At that point, the zinc carbonate begins to break down into varying levels of corrosion. In the U.S., the galvanizing process can provide roughly 30-40 years of corrosion resistance, depending on the environment. The Corrosion Process for Galvanized Steel In fact, there are a million steel transmission structures fighting corrosion issues in North America and nearly 20 percent of the world’s steel production supports replacing steel structures and equipment that has been damaged by corrosion.
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