Iron Corrosion From Oil In A Load Tap Changer
The two flakes on the left are limonite and the red particle on the right is hemetite.
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.
Significance in the Environment:
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