Corrosion Analysis

Corrosion Analysis


X-ray powder diffraction (XRD) represents the method of choice for the analysis of corrosion products, as it is the only analysis method that readily provides information about the phase-composition of solid materials. For example, a mixture of Fe3O4 (magnetite), α-FeO(OH) (goethite) and Fe5O7(OH)x4H2O (ferrihydrite) can be identified and quantified as such, while other analysis methods will only reveal that the corrosion product is Fe-based. Furthermore, XRD can readily distinguish between different crystallographic modifications of phases that have the same chemical formula. For example, the ferrous corrosion products goethite, lepidocrocite, feroxyhyte and akaganeite can be distinguished from each other, even though they all have the chemical formula FeO(OH).

The identification of phase compositions (as opposed to elemental compositions) is crucial for the understanding of  corrosion processes. Different phases build under different conditions and in different environments. Information about the chemical phases is not only helpful to explain the corrosion process, but can help to locate the origin of corrosion in a facility and, at the same time, provide solutions to the problem. Ferrous corrosion and rust are some of the most common forms of corrosion analyzed. Typically, no more than a few hundred milligrams of corrosion product will be required for XRD phase analysis.

Quantitative XRD of hematite.
Quantitative XRD of a complex mixture of iron oxides.
Quantitative XRD of CuO and Cu2
Quantitiative XRD of Fe3O4
 and α-Fe2O3 (hematite)
 Quantitative XRD of a complex
 mixture of iron oxides.
Quantitative XRD of CuO and Cu2O
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CAMET Research, Inc.
An X-Ray Diffraction (XRD) Laboratory
6409 Camino Vista #F, Goleta, CA 93117, USA
Phone: (805) 685-1665
Fax: (805) 685-9082
E-mail: camet@camet-lab.com
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