4 Explain why the corrosion rate for a small anodetocathode

(4) Explain why the corrosion rate for a small anode-to-cathode area will be higher that for a large anode-to-cathode area.

Solution

REASON:

For small anode-to-cathode area the corrosion rate will be higher than for a large anode-to-cathode area . The reason for this is that for some given current flow associated with the corrosion reaction, for a small area the current density at the anode will be greater than for a large area.The corrosion rate is inversly proportional to the area.

corrosion rate =KW/At.