Galvanization expert witnesses may write reports and opine on galvanic corrosion, pitting corrosion, corrosion fatigue, and more. The Corrosion Technology Laboratory at the NASA Kennedy Space Center defines galvanic corrosion:
Galvanic corrosion is an electrochemical action of two dissimilar metals in the presence of an electrolyte and an electron conductive path. It occurs when dissimilar metals are in contact.
It is recognizable by the presence of a buildup of corrosion at the joint between the dissimilar metals. For example, when aluminum alloys or magnesium alloys are in contact with steel (carbon steel or stainless steel), galvanic corrosion can occur and accelerate the corrosion of the aluminum or magnesium.
For more, see corrosion corrosion.ksc.nasa.gov.