ChemistryCode 5070
Corrosion of metals
What this topic asks you to be able to do
- Give the circumstances that must be present for iron and steel to rust and produce hydrated iron(III) oxide
- Describe the manner in which barrier methods stop rusting by keeping oxygen or water away
- Give a few widespread barrier methods, including painting, greasing and coating with plastic
- Account for how sacrificial protection works, relating it to the reactivity series and also to electron loss
- Describe how galvanising with zinc works both as a barrier method and as sacrificial protection