Corrosion of EMI Gaskets

November 23, 2018, 10:35 am
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Corrosion can manifest itself in many forms. Some common forms are galvanic, pitting, and crevice corrosion. However, galvanic corrosion is the major concern in shielding applications. Galvanic corrosion is driven by the interaction of the gasket and the electronic enclosure, since in a shielded joint there are often two dissimilar materials in intimate contact.

There are three conditions that must exist for galvanic corrosion to occur:

  1. Two electrochemically dissimilar materials present
  2. An electrically conductive path between the two materials
  3. An ionic conduction path (typically a corrosive environment) between the materials

If any of these three conditions is missing, galvanic corrosion will not occur. If we examine each of these conditions in detail, we will not only understand galvanic corrosion, but also know how to prevent it.

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