Question

(a) Define corrosion, what name is given to the corrosion of iron?
(b) Name the colour of coating formed on silver and copper articles, when exposed to air?
(c) List two damages caused by corrosion and suggest how corrosion can be prevented.

Answer 1

a)corrosion is the process when a metal gets damaged due to the reaction with moisture or acid
b)silver-black
copper-green
c)rusting of iron

prevention -galvanization, chrome plating, anodizing,greasing, painting etc

Answer 2

(a) Corrosion could be a process by which an oxide layer is created on a metal surface because of oxidation when the metal is exposed to moist air. The corrosion of iron is termed rusting.

(b) The metal silver on exposure to moist air develops a black coating and on the other hand copper on exposure to moist air develops a greenish coating.

(c) The damages caused by corrosion to metal are :

• It results in a reduction of the strength of the metal.

• Corrosion eats up the metal and decreases the size.

Prevention: Corrosion can often be prevented by the methods of painting, galvanizing, alloying, oiling, tinning, or greasing.

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