What are the disadvantages of galvanized grating?
Galvanizing adds cost and lead time, can leave a non-uniform finish, and the zinc layer wears slowly in very abrasive or aggressive chemical environments — where FRP or stainless is preferred. Cut edges should be touched up to keep protection.
Other minor drawbacks include initial surface unevenness (zinc runs and spangle), the need to design vent and drain holes so the molten zinc flows freely, and a brief "wet storage stain" risk if freshly galvanized panels are stacked damp.
None of these outweigh the corrosion protection for general industrial use, but in strong acids, alkalis or constant salt exposure the zinc is consumed faster and a non-metallic option like FRP lasts longer.
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