Materials Science
A chip in car paint spreads. A scratch on a galvanised gate does not. The difference is worth ₹ lakhs on a real structure
27 Aug 2026 · 14 min read
Both are bare steel exposed to the same air, and they behave completely differently. The reason is that rust is not a chemical attack on metal — it is a battery, and a coating can interrupt it in three quite different ways. Here is which is which, why a small defect can be worse than no coating at all, and why salt-spray hours are a bad thing to buy on.
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