4.10.3 Using materials Flashcards
What is corrosion?
Corrosion is the destruction of materials by chemical reactions with substances in the environment.
What is rusting?
Rusting is an example of corrosion that occurs when iron reacts with air and water.
How can corrosion be prevented?
Corrosion can be prevented by applying a coating that acts as a barrier, such as greasing, painting, or electroplating.
What is sacrificial protection?
Sacrificial protection involves using a more reactive metal to protect another metal from corrosion, such as zinc used to galvanize iron.
What are alloys?
Alloys are mixtures of two or more metals, commonly used in everyday materials.
What is bronze?
Bronze is an alloy of copper and tin.
What is brass?
Brass is an alloy of copper and zinc.
How is the purity of gold measured in alloys?
The purity of gold in alloys is measured in carats, with 24 carat being 100% pure gold and 18 carat being 75% gold.
What are the properties of high carbon steel?
High carbon steel is strong but brittle.
What are the properties of low carbon steel?
Low carbon steel is softer and more easily shaped.
What are stainless steels?
Stainless steels are alloys of iron that contain chromium and nickel, making them hard and resistant to corrosion.
What is soda-lime glass?
Soda-lime glass is made by heating a mixture of sand, sodium carbonate, and limestone.
What is borosilicate glass?
Borosilicate glass is made from sand and boron trioxide and melts at higher temperatures than soda-lime glass.
How are clay ceramics made?
Clay ceramics are made by shaping wet clay and then heating it in a furnace.
What affects the properties of polymers?
The properties of polymers depend on the monomers they are made from and the conditions under which they are produced.
What is the difference between thermosoftening and thermosetting polymers?
Thermosoftening polymers melt when heated, while thermosetting polymers do not melt when heated.
What are composites?
Composites are made of two materials, with a matrix or binder surrounding and binding together fibres or fragments of the other material.
