Distinguish between Galvanizing and tinning.

Distinguish between Galvanizing and tinning. 
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1 Answer

Answer :

Galvanizing
Tinning
A process of covering iron or steel with a thin coat of Zinc to prevent it from rusting.
A process of covering iron or steel with a thin coat of Tin to prevent it from corrosion. 
In galvanizing, zinc protects the iron as it is more electropositive than iron. It does not allow iron to pass into solution.
Tin protects base metal iron from corrosion, as it is less electropositive than iron and higher corrosion resistance.
In galvanizing Zn continues to protect the metal by galvanic cell action, even if coating of Zn is broken.
In tinning, tin protects the iron, till the coating is perfect. Any break in coating causes rapid corrosion
Galvanized containers cannot be used for storing acidic food stuff, since Zn reacts with food acids forming Zn compounds which are highly toxic i.e. poisonous.
Tin coated containers and utensils can be used for storing any food stuff since Tin is nontoxic and protects the metal from corrosion and does not causes food poisoning.
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