I'm going to use Polarization resistance (PR) & Tafel tests to measure corrosion rate of welds , Is it possible to get Corrosion rate-time relationship from these techniques?
you can follow polarization resistance changes with time
it is corrosion rate vs time
better follow ZRA
you balance the voltage difference between your weldment and the alloy of equal area with external voltage source like potentio meter with 3V battery cell
The current needed to make the voltage zero is galvanic current