# How does salt concentration affect corrosion rate of iron?

I have conducted an experiment where I test the affect of $\ce{NaCl}$ concentration on corrosion rate of iron. I did this in an environment were all of the iron was submerged in water and the water was not aerated. The results I got are shown in the graph below.

Are there any research papers that could support or neglect my data? Can anyone explain this relationship? Is 1M just an outlier?

• Run one more experiment, this time at 0.9 or maybe at 1.2. One data point can be a meaningful trend, or it can be an outlier, you can never tell. Well, if the experiment actually takes years to run, then things become tricky. – Ivan Neretin Feb 8 '16 at 14:52
• > water was not aerated || in this case the corrosion is attributed solely to dissolved oxygen. Solubility of oxygen decreases with salt concentraion AFAIK, while chlorine ions promote corrosion of iron. – permeakra Feb 8 '16 at 17:20
• Are you completely sure that that point does not correspond to 0 mol/L? It would fit better there, if still a bit low. And it is an obvious point to include in the trials. If so, the interpretation would be that with a very small amount of salt the corrosion increases a lot, and with higher quantities, the corrosion still increases but not so fast. – Raoul Kessels Feb 6 '18 at 17:16
• 100% sure that the point corresponds to 1 mol/L, as couple of trials were conducted – kyczawon Feb 10 '18 at 15:27