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Galvanic corrosion is most severe when the anodic metal has a

  • A.small area and the cathodic metal a large one
  • B.large area and the cathodic metal a small one
  • C.area equal to the cathodic metal's
  • D.higher hardness than the cathodic metal

Answer: A

The whole current generated by a large cathode is concentrated on a small anode, so its penetration rate is enormous. A steel rivet in a copper plate perforates quickly, whereas copper rivets in a steel plate cause only slight general attack.

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