- Explain the use of aluminium in aircraft manufacture in terms of the properties of the metal and alloys made from it.
Aluminium is used to make aircraft bodies because it is a very lightweight metal- has very low density. It is also quiet strong. This combination of strong and lightweight is perfect for airplane bodies.
- Explain the use of zinc for galvanising steel, and for sacrificial protection.
Zinc is used to galvanise (coat/plate) iron or mild steel to prevent rusting. The zinc forms a coating on the surface of the iron or steel. Galavanised steel is used for roofing because it is weather resistant.
- Explain the use of aluminium in food containers because of its resistance to
corrosion.
Aluminium is also used to make food containers and cooking foil. This is because aluminium has an unreactive oxide layer on its surface which does not flake off. This means that aluminium is resistant to corrosion. These oxides do not react with any of the acids present in the food, keeping it fresh.
Notes submitted by Lintha
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