20/08/2026
Steel does not rust the moment it goes inside concrete. There is actually chemistry working in its favour from day one.
Fresh concrete is highly alkaline, and that environment forms a microscopic protective film around the steel inside it. As long as that film stays intact, the steel underneath stays safe, sometimes for decades, without any visible sign of protection at all.
This is why corrosion is not really about steel being weak. It is about that invisible shield breaking down, usually because of chlorides or a drop in pH over time. Once that happens, the clock starts on deterioration, even if the surface still looks fine.
Understanding this is the first step to protecting infrastructure the right way. One cannot fix what one does not understand, and this passive layer is where the entire story of corrosion begins.
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