Page 3 - 3. Lesson Notes - Ch-3 Uses of Metals & Nonmetals (Alloys)

ii. Stainless steel- When iron is mixed with nickel and chromium, we
get stainless steel. It is hard, shiny and does not rust.
iii. Alnico- Iron when alloyed with aluminium, nickel & cobalt, shows
magnetic properties & is used to make permanent magnets. This
alloy is known as Alnico.

2. Some commonly used Alloys-

o
L
.
m
e
Solder . 50% Tin lting point . to solder electrical
w
. 50% Lead connections.
Amalgam . Mercury with other . Can be moulded . used for dental filling.
metals like silver, into different shapes
tin, and Copper . Sets into a hard
mass.
22 carat . 22 parts of Gold . Increasing the . Used to make
Gold . 2 parts of strength of gold as jewellery.
Copper/Silver compared to pure
gold.

❖ Prevention of corrosion-
The rusting of iron can be prevented by painting, oiling, greasing,

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