What factors affect Corrosion?

The rate of corrosion (rusting) of iron depends on a number of factors.1] Presence of water;2] Amount of oxygen dissolved in the water (strictly differential aeration between different parts of the iron)3] The temperature (all reactions are quicker at higher temps.)4] The presence of electrolytes in the water (e.g. salt)5] The purity of iron (the greater the purity the slower the corrosion).Hope this helps.