How long will a galvanized G40/G60/G90 coating last?
How long the galvanization lasts depends primarily on the site conditions (i.e. temperature, exposure, moisture, etc.), with a linear relationship between coating thickness and ability to resist corrosion. So, doubling the thickness of a uniform zinc coating will double the time it protects the steel. The AISI has a good guide on the durability of steel framing members .
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