Class-10 NCERT (CBSE), Corrosion and its Preventive Measures

1. AKANKSHA
INTEGRATED B.SC. B.ED
LOVELY PROFESSIONAL UNIVERSITY, PHAGWARA

2.  It is the slow process of eating away of metal
by the reaction of atmospheric air and
moisture. - E.g. Rusting of iron, tarnishing of
silver, formation of green coating over copper,
etc.

5. Method-1. Barrier Protection

7.  Corrosion of iron i.e. rusting can be prevented
by Galvanization.
 Zinc metal does not corrode on exposure to
air. So zinc coating protect iron from rusting.
Zinc itself forms a protective coating of basic
zinc carbonate [Zn(OH)2.ZnCO3].
Method-2. Galvanization

9.  Rusting can be prevented by coating the
surface of iron object with chromium, tin,
nickel or aluminum. These metals resist
corrosion. Hence, they protect iron from
rusting. They may be coated by
electroplating.

11.  Corrosion can also be prevented by converting
the metals like iron into an alloy with
chromium and nickel. This alloy is called
stainless steel.

13. Que-1.Which metals do not corrode easily?
Que-2. What are alloys?
Que-3. Which of the following methods is suitable for
preventing an iron frying pan from rusting?
(a) Applying grease
(b) Applying paint
(c) Applying a coating of zinc
(d) All of the above.