Rusting of Iron

water

boiled water

layer ofoil

A B C D E

zinc foil

water

F

salt wate

r

Rusting of Iron

anhydrous

calciumchloride

Results (after one week)

Tube Conditions Observation

A normal air

B air but no water

C water and dissolved air

D water but no air

E water, air and salt

F water air, and a more reactive metal

 

Results (after one week)

Tube Conditions Observation

A normal air

B air but no water

C water and dissolved air

D water but no air

E water, air and salt

F water air, and a more reactive metal

 

some rust

no rust

rusty

no rust

very rusty

no rust

ConclusionFor rusting to happen, both _____ and ______ must be present.

______ can make rusting worse.

   

Ways of preventing rust Method Example

        Coat with oil or grease Bicycle chain

        Coat with layers of paint Car body

        Galvanize with zinc Nail

        Alloy with other metals Stainless steel cutlery

        Electroplate with another metal

Jewellery

        Use sacrificial protection  Ship’s hull

air water

Salt

        Coat with plastic Mesh fence