Iron Corrosion From Oil In A Load Tap Changer

Transmitted Brightfield and Reflected Darkfield Illumination

Definition/Function:

Limonite is FeO-OH-nH₂O. It varies in color from very pale yellow to orange-brown, depending on the amount of water in the matrix. In oil filled systems the form of the limonite particle reflects the shape of the interface between the oil and the water layer. Limonite is amorphous or cryptocrystalline but as it looses more water the nuclei convert to a more evident crystal structure. There are at least five forms of FeO-OH that have distinctive crystal structures. They include lepidocrocite, goethite, and others.

Hemetite is Fe₂O₃. It is the fully oxidized form of iron oxide.

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