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What does it mean for the steel in metal buildings to be hot-dip galvanized?

Is that the best choice for my building?
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Generally speaking, galvanization is the process of applying a coating of zinc to iron/steel/aluminum, in order to prevent rusting.  Since zinc has very strong anti-corrosive properties, people have been using zinc to coat other metals in construction for centuries.  

Hot-dip galvanization is one method of applying the zinc to the steel- other methods, including using a coating of zinc-rich paint, electroplating, etc., are also common.  Hot-dip galvanizing involves dipping the steel building frame and structural parts into a vat of molten zinc, and allowing the zinc and the iron to react and form an anti-corrosive alloy.  

Hot-dip galvanized surfaces typically exhibit a slightly crystalline, shiny property, commonly referred to as being "spangled".

When it comes to metal buildings, hot-dip galvanization is one of the most popularly recommended methods of protecting your structure against rust and other forms of corrosion.  Sometimes, people apply anti-corrosive paint on top of a hot-dip galvanized structure, adding further protection.
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