Discussion
Tinning is preferred to galvanising for food containers because tin is
Answer: D
Correct answer: non-toxic and does not taint the contents
Tin is chosen for food use because its salts are harmless and it does not affect the taste of the contents, and inside a sealed can there is little oxygen for it to fail against. Zinc would protect the steel better at a scratch but its salts are not acceptable in food, so the electrochemically inferior coating is the right engineering choice here.
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