Under field service conditions, military avionics experience corrosion between which types of metal surfaces?

Corrosion in military avionics under field service conditions is particularly prevalent at electrical bonding and grounding connections. This occurs because these connections often involve different types of metals that, when in contact with one another in the presence of moisture or contaminants, can create galvanic corrosion. This type of corrosion arises when two dissimilar metals are electrically connected in a conductive environment, leading to the more anodic (less noble) metal corroding faster than it normally would.

In avionics, bonding and grounding connections are essential for both the safe operation of electrical systems and the protection against electromagnetic interference. Given the harsh environments that military aircraft operate in, these connections are susceptible to wear and corrosion due to vibration, humidity, and potential exposure to other environmental factors. Hence, maintaining these connections free of corrosion is critical to ensure the reliability and safety of avionics systems.

The other options involve components that may also face corrosion issues, but they do not specifically highlight the critical interaction seen in electrical bonding and grounding environments, where the risk of galvanic corrosion is most pronounced in mixed-metal scenarios.