Effect of low temperatures on the rate of corrosion of a metal

Predict the effect of low temperatures at great depths on the rate of corrosion of a metal

  • At great depths, the following conditions have the following effects on the rate of corrosion:
Factor:State:Effect on Rate of Corrosion:
TemperatureVery low    Decrease, due to lower kinetic energies of interacting particles
Oxygen levelsVery lowDecrease, as oxygen is essential for the formation of metal oxides
Salinity levelsHigher than the surfaceSlight increase, but little difference
  • However, corrosion at great depths occurs to a much greater extent than would be expected from the above information.
  • Much of the corrosion at great depths is caused by certain anaerobic bacteria that reduce sulfate to sulfide.