LO3: Material Failure Quiz

What is corrosion?

• Increase in material thickness

• Formation of a protective layer on a material

• Strengthening of a material through exposure to oxygen

• Deterioration of a material due to a reaction with its environment

Which environmental factor affects degradation in wood by biological organisms such as fungi and insects?

• Moist humid conditions

• Risk of wetting or permanent contact with water

• Exposure to UV light

• Presence of electrolytes

What effect does heat have on certain plastics?

• Strength and stiffness increase

• Plastics become more flexible

• Plastics weaken or melt

• Plastics become brittle

Which metal is particularly resistant to corrosion and forms strong oxides on its surface?

• Lead

• Steel

• Copper

• Aluminium

What is sacrificial protection in metals?

• Anodising the metal surface

• Sacrificing one metal to protect another

• Applying a protective coating of paint

• Using electro-plating for protection

What is the purpose of anodising of aluminium?

• To produce a chalky faded appearance

• To provide sacrificial protection

• To give the coating an attractive color

• To increase the thickness of the metal

What is the effect of corrosion on the mechanical and physical properties of metals?

• Increase in metal thickness

• Strengthening of the metal

• Reduction of metal thickness leading to loss of strength

• No effect on the metal properties

What is the purpose of protective coating using metal spraying?

• To produce a chalky faded appearance

• To provide sacrificial protection

• To increase the thickness of the metal

• To give the coating an attractive color

What is the main cause of corrosion in metals?

• Contact with other metals

• Presence of moisture

• Reaction with oxygen in the atmosphere

• Exposure to UV light

What is the purpose of electro-plating in metals?

• To provide sacrificial protection

• To provide a decorative and/or protective metal coating

• To increase the thickness of the metal

• To produce a chalky faded appearance