Why is it critical to manage dissimilar metal potential in aircraft repairs?

Managing dissimilar metal potential in aircraft repairs is crucial primarily because it prevents galvanic corrosion. Galvanic corrosion occurs when two different metals are in electrical contact with each other in the presence of an electrolyte, which can lead to accelerated deterioration of one of the metals.

In the context of aircraft maintenance, different metals, such as aluminum and steel, may be used in the construction of various components. If these metals are connected, and moisture or other electrolytic substances are present, this can set up a galvanic cell. The less noble metal (anodic) will corrode faster than it would in absence of the other metal, potentially compromising the aircraft’s safety and longevity.

By effectively managing the potential for galvanic corrosion through appropriate measures, such as using insulating materials or applying protective coatings, maintenance personnel can help ensure that the aircraft remains structurally sound and operationally safe, thus avoiding costly repairs or replacements due to corrosion-related failures. This focus on preventing galvanic corrosion is a critical part of ensuring the longevity and reliability of aircraft structures.