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Rusting Material
Rusting of materials
Rust consists of iron oxide which is a brownish red substance formed by the
reaction of iron
exposed to
oxygen
in the presence of
water
or air humidity. The rust surface is unstable and brittle.
7.1
Rusting of materials
Objects in our environment are made of various materials
There are materials that can rust and there are materials that cannot rust
Factors that cause rusting
Presence of
water
Presence of
air
Rusting will not occur if one of these factors is absent
Rusty objects
Objects made of
iron
can rust.
Examples of objects that can rust are iron mailboxes, iron spoons, iron knives.
When rusting occurs, the object will turn brownish red, the rusty surface becomes rough and brittle.
At some point, the iron turns completely to rust and crumbles.
Importance of preventing objects from rusting
Objects will
last longer
and will
not break easily
Objects will look
clean
and
pleasant
Saves cost
as objects do not need to be replaced frequently
Objects are
safe
to use
Ways to prevent rusting
Rusting can be avoided by preventing objects made of iron and steel from coming into contact with air and water.
The following methods are used to prevent rusting:
Painting
Applying oil or grease
Coating with anti-rust materials such as plastic
Rusting of materials
Rust consists of iron oxide which is a brownish red substance formed by the
reaction of iron
exposed to
oxygen
in the presence of
water
or air humidity. The rust surface is unstable and brittle.
7.1
Rusting of materials
Objects in our environment are made of various materials
There are materials that can rust and there are materials that cannot rust
Factors that cause rusting
Presence of
water
Presence of
air
Rusting will not occur if one of these factors is absent
Rusty objects
Objects made of
iron
can rust.
Examples of objects that can rust are iron mailboxes, iron spoons, iron knives.
When rusting occurs, the object will turn brownish red, the rusty surface becomes rough and brittle.
At some point, the iron turns completely to rust and crumbles.
Importance of preventing objects from rusting
Objects will
last longer
and will
not break easily
Objects will look
clean
and
pleasant
Saves cost
as objects do not need to be replaced frequently
Objects are
safe
to use
Ways to prevent rusting
Rusting can be avoided by preventing objects made of iron and steel from coming into contact with air and water.
The following methods are used to prevent rusting:
Painting
Applying oil or grease
Coating with anti-rust materials such as plastic
Chapter : Rusting
Topic : Rusting Material
Year 5
Science
View all notes for Science Year 5
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