Rust is an , irreversible (chemical) change., Iron + oxygen + water -->, hydrate iron (III) oxide (rust), Galvanise means, adding a layer of zinc to the iron to prevent rusting., You add a barrier such as,, oil, paint or a wrap to the iron to prevent it rusting., Sacrificial protection, attaching bars of magnesium the magnesium reacts first as it is more reactive than the iron.

Rusting

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