Give two reasons why tin is more suitable than zinc for prevention of rusting in tin cans
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Explanation:
Zinc has the capacity to resist corrosion whereas tin is much more susceptible to corrosion. Tin is less reactive and less strong too. Zinc has a stable structure and hence doesn't get corroded easily.
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Zinc is more reactive than iron, so it also acts as a sacrificial metal. This protection works, even if the zinc layer is scratched. The inside of a steel food can is electroplated with tin, a less reactive metal than iron. It provides a physical barrier to oxygen and water, stopping the can rusting.
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