Corrosion
Corrosion – when metals react with water and oxygen. The metal ions lose electrons to form ions.
Rusting – the corrosion of iron metal to form a red-brown compound (hydrated iron (III) oxide)
| Covering with Protective Coat | Preventing Oxidation of Metal |
| Painting | Galvanising – zinc atoms react before the iron |
| Greasing of metal parts | Sacrificial protection – a more reactive metal reacts before the metal that it is protecting |
| Oiling of bike chains | |
| Tin Plating – In cans | Carthodic protection – an electric power source pushes electrons into the metal to prevent the loss of electrons |
| Plastic covering on electric wires | |
| Galvanising – zinc coating for galvanised steel | |
| Chromium plating of car parts |