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Hot dip galvanizing is the process of applying a zinc coating to fabricated steel structures and parts by immersing them in a molten zinc bath, creating a metallurgical bond to the steel.The galvanized coating provides both barrier and cathodic protection against corrosion.ot dip galvanizing is the process of applying a zinc coating to fabricated steel structures and parts by immersing them in a molten zinc bath, creating a metallurgical bond to the steel.
When steel is submerged in melted zinc, a chemical reaction permanently bonds the zinc to the steel. Therefore, the zinc isn't exactly a sealer, like paint, because it doesn't just coat the other metal; it actually permanently becomes a part of it. The most external layer is all zinc, but successive layers are a mixture of zinc and iron, with an interior of pure steel. This process, known as hot-dipped galvanization, is one of the most common methods of making galvanized steel, but it's not the only one. Continuous sheet galvanizing runs a steel sheet or wire through molten zinc; it's also a form of hot-dipping, but leaves a thinner layer of the protective metal.