Why is steel grating hot-dip galvanized?
Hot-dip galvanizing coats the steel in zinc (typically to ASTM A123) to stop rust. It gives decades of maintenance-free outdoor service and is the standard finish for industrial and marine grating. Painted or bare options exist for indoor or short-life use.
In hot-dip galvanizing the finished panel is dipped in molten zinc, which metallurgically bonds to the steel and protects it both as a barrier and sacrificially — the zinc corrodes in preference to the steel even at cut edges and scratches.
Coating life scales with thickness and environment: inland a galvanized panel can last 50+ years, while in coastal or industrial atmospheres life is shorter and FRP or stainless may be preferred.
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