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Cadmium Plating Degradation happens in aircraft fuel tanks when the steel components inside the fuel tanks are exposed to water and moisture. Sulfur in the aircraft fuel has a chemical reaction and causes the Cadmium Plating to be removed exposing the bare surface of the steel. Cadmium is plated on steel parts so the parts will not corrode and not have dissimilar metal corrosion.
There are several aircraft manufactures that have acknowledge the problem of cadmium plating degradation such as Gulfstream. They have certain maintenance intervals checking for the Cadmium degradation of the steel components in the fuel tanks. Gulfstream has particular procedures to treat the steel components and other manufactures only have brief statement in there manuals on what is look like and to treat it.
SEAL Aviation is the leader in the industry for working with cadmium plating Degradation issues.