When we include a salt such as NaCl in
solution, it will dissociate into Na+ and Cl-
ions. These ions increase the conductivity of the
solution (i.e. the ability of electrons to flow).
Conductivity plays a role in corrosion since
corrosion is a redox reaction that depends on the
flow of electrons from one of the metals toward
the other. So increased ability of electrons to
flow means that corrosion will happen faster.
Furthermore, increased concentration of NaCl will
increase conductivity, but only until NaCl is
saturated in solution (i.e. the NaCl stops
dissociating into its ion pairs). I hope this
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