Question

Galvanising means coating an iron (Fe) or steel object with a layer of zinc (Zn) to protect it from
corrosion. Steel cans can also be coated with tin (Sn), also to protect it from corrosion, including
fruit juices in 'tin' cans. When the zinc coating is scratched through to the iron underneath, the iron
still does not corrode initially. However, if the tin surface is scratched through to the iron, the iron
corrodes even faster compared to when there was no coating at. Does this mean?
A. Iron corrodes slower when connected to a less reactive metal
B. Zinc is less reactive than iron
C. Iron corrodes faster when connected to a more reactive metal
D. Tin is less reactive than iron

Answer 1

Answer:

My understanding of these two metal coatings is that zinc is a sacrificial anode when applied to steel, while tin is not, though both provide corrosion protection under ideal circumstances. Point being, if the surface is scratched, the zinc will still (generally) corrode before the steel does.

Explanation:

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Answer 2

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