Understand that galvanic corrosion rate grows with the potential difference between the two metals, but the area effect is often more dangerous in practice: a small anode paired with a large cathode concentrates all the corrosion current onto that small area, corroding it far faster than equal areas would.
Corrosion rate ∝ ΔE · (Cathode area / Anode area)Keep cathode and anode area equal (50 cm² each). Confirm the corrosion rate equals the potential difference times the rate constant, with no area amplification.
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