Electrical contacts having sacrificial layer for corrosion protection

A method of manufacturing an electrical contact, the method comprising:

• plating a first layer on a substrate, the first layer formed of a first material;
• plating a second layer on the first layer, the second layer formed of a second material;
• and
• plating a top layer on the second layer, the top layer formed of a third material, wherein the top layer comprises a plurality of discontinuities, and
• wherein the second material is more electrochemically active than either the first material or the third material.

An electronic device comprising:

• a device enclosure substantially enclosing the electronic device;
• a plurality of openings in the device enclosure;
• a plurality of electrical contacts, each located in one of the plurality of openings in the device enclosure, each having a top layer forming a contacting surface, wherein the contacting surface forms an electrical connection with a corresponding contact in a corresponding connector when the corresponding connector is mated with the plurality of electrical contacts, the top layer formed of a first material;
• a plurality of first rings, each around one of the plurality of electrical contacts, each formed of a second material, the second material more electrochemically active than the first material;
• and
• a plurality of second rings, each around one of the first rings.