What are non-ferrous metals and alloys, and how do their properties decide their uses?
Non-ferrous metals and alloys (aluminium, copper, brass) and their composition, properties and engineering applications.
A CCEA GCSE Engineering and Manufacturing answer on non-ferrous metals and alloys, including aluminium, copper and brass, their properties such as corrosion resistance and conductivity, and their engineering applications.
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What this dot point is asking
CCEA Unit 3 expects you to know that non-ferrous metals contain no iron (or only iron as a minor element), to name common examples (aluminium, copper) and a common alloy (brass), to describe their properties, and to explain why each suits its engineering applications. You should also be able to define what an alloy is.
The answer
What makes a metal non-ferrous
Non-ferrous metals are chosen when an engineer needs properties that steel cannot easily give, such as light weight, high electrical conductivity, or strong corrosion resistance.
The main non-ferrous metals
| Non-ferrous metal | Key properties | Typical application |
|---|---|---|
| Aluminium | Low density (lightweight), corrosion resistant, good conductor, ductile | Aircraft parts, drinks cans, window frames, cooking foil |
| Copper | Excellent electrical and thermal conductor, ductile, corrosion resistant | Electrical wiring, PCB tracks, water pipes, heat exchangers |
| Zinc | Corrosion resistant, low melting point | Galvanising coatings on steel, die castings |
| Tin | Corrosion resistant, low melting point, non-toxic | Coating steel cans (tinplate), soft solder |
Non-ferrous alloys
Alloying lets engineers tune a metal: brass is harder and easier to machine than pure copper, and resists corrosion better than steel.
Worked example: choosing a non-ferrous metal
Examples in context
- Example 1. Household wiring
- The conductors are copper because it is an excellent electrical conductor and ductile enough to draw into thin wire; the outer parts may use aluminium where weight and cost matter more.
- Example 2. A drinks can
- The body is aluminium: light, corrosion resistant, easily formed and recyclable. The same metal is used for aircraft skins for exactly the same reasons of weight and corrosion resistance.
- Example 3. A tap or door handle
- These are often brass because the copper-zinc alloy resists corrosion in wet conditions, machines cleanly into shape and looks attractive without a separate finish.
The pattern is that non-ferrous choices are driven by a special property: weight (aluminium), conduction (copper), or corrosion resistance and appearance (brass and bronze).
Try this
Q1. What is the defining feature of a non-ferrous metal? [1 mark]
- Cue. It contains little or no iron.
Q2. Why is copper used for electrical wiring? [2 marks]
- Cue. It is an excellent electrical conductor and is ductile, so it can be drawn into wire.
Q3. Name the two metals that make up brass and give one use. [2 marks]
- Cue. Copper and zinc; used for door fittings, taps or electrical terminals.
Exam-style practice questions
Practice questions written in the style of CCEA exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
CCEA style4 marksAluminium and copper are both non-ferrous metals. For each, give one property and one engineering application that depends on that property.Show worked answer →
Aluminium has a low density (it is lightweight) and resists corrosion, so it is used for aircraft parts, drinks cans and window frames where saving weight matters.
Copper is an excellent conductor of electricity and heat and is ductile, so it is used for electrical wiring, printed circuit board tracks and heat exchangers and pipes.
Markers reward one correct property and a matching application for each metal. Note that the application must depend on the property given (for example "copper, good conductor, used for wiring").
CCEA style3 marksBrass is an alloy. State what an alloy is, name the two metals that make up brass, and give one reason brass is used for door fittings.Show worked answer →
An alloy is a mixture of two or more metals (or a metal and another element) combined to improve properties such as strength, hardness or corrosion resistance.
Brass is an alloy of copper and zinc.
Brass is used for door handles, locks and fittings because it is corrosion resistant, hard wearing and has an attractive gold-like appearance, and it machines well.
Markers reward the definition of an alloy, copper plus zinc, and one valid reason (corrosion resistance, appearance, machinability or hardness).
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