EDX (Energy-Dispersive X-ray Spectroscopy)
Definition: EDX is an analytical method for determining the elemental composition of materials by means of characteristic X-ray radiation. It is mostly used in combination with a scanning electron microscope (SEM). The method enables a spatially resolved qualitative and semi-quantitative elemental analysis.
Practical relevance: EDX serves to identify alloying elements, foreign particles, corrosion products or coating compositions. The detection limit is typically around 0.1-1 wt.-%, depending on the element and the detector system. Results are presented as a spectrum or element mapping. Limitations exist for light elements (e.g. H, He) and for very thin layers.
Decision-making perspectives:
- Technical decision-makers: Verification of material compositions and root cause analysis in cases of failure.
- Purchasing/project management: Verification of alloys or coatings conforming to specification.
- Science: Combination with EBSD or WDX for in-depth microstructure and phase analysis.
- Insurance/law: Documented elemental analysis to preserve evidence in the event of material deviations.
Typical testing or verification methods: SEM-EDX analysis, point analysis, line scan, element distribution mapping.
FAQ:
- Can EDX determine the exact chemical composition?
- EDX generally provides a semi-quantitative analysis; for high-precision determinations, supplementary methods are required.
