Electrochemistry Ques 62

62. The most durable metal plating on iron to protect against corrosion is

[1994]

(a) nickel plating

(b) copper plating

(c) tin plating

(d) zinc plating.

Show Answer

Solution:

(d) This is because zinc has higher oxidation potential than $Ni, Cu$ and $Sn$.

The process of coating of iron surface with zinc is known as galvanization. Galvanized iron sheets maintain their lustrue due to the formation of protective layer of basic zinc carbonate.



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