Rusting is when iron meets oxygen and water, and decides to slowly turn into a weak, flaky red powder. Galvanisation stops it by giving the iron a sacrificial coat of zinc, which gets eaten first. But let me tell you, from what I see in the scrapyard, nothing stops it forever. That zinc layer gets scratched, or the coating is too thin, and the rust begins its feast underneath. I see so many 'galvanised' buckets and grills come in, red with betrayal, while the old, thick cast-iron cooking pot from my ammayi's kitchen, dried properly after each use, sits without a single spot of rust.
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