蜜芽传媒

The corrosion of iron is explained through a diagram of the electrochemical processes involved. When iron is exposed to water, an electrochemical cell is created. Ferrous ions form and electrons are released. These are conducted through the metal to the edge of the drop where they react with water and atmospheric oxygen to form hydroxide ions. The ferrous ions and the hydroxide ions react to form iron hydroxide. Finally, oxygen in the water oxidises this to form rust.