Why do we have to make the cathode area and anode area equal when measuring galvanic current using zero resistance ammeter? We can still measure the current density of the cathode and anode by dividing the current by area.
when you have two dissimilar metals/alloys we have galvanic current flow; The voltage developed between them is brought to zero by imposing voltage.now galvanic current is the current required to bring the voltage to zero.
.The corrosion potential of the cathode depends on area and the anode potential also depends on area . by making their area equal we avoid the complication of area .
i explain
when we talk about corrosion we talk only corrosion current density
current density flowing at the cathode is E corr , C / resistance
current density flowing at the cathode is E corr , a / resistance
now to make them equal we keep the area same so that both C.D.are equal
now what we measure is galvanic current density
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