Dark field imaging of the in vitro corrosion of biodegradable magnesium screws

Sascha Senck, Jonathan Glinz, Daniel Salaberger, Sarah Heupl, Johann Kastner, Klemens Trieb, Daniel Koutný, Stefan Gneiger

Research output: Chapter in Book or Conference ProceedingsConference Proceedings with Oral Presentation


Orthopedic magnesium implants offer a unique solution for the repair and internal fixation of bones since they are biodegradable, i.e., eventually absorbed by the body. In this contribution, we analyse screws from the magnesium alloy MX1 (1% Mn, < 0.5% Ca). The test sample is represented by an ISO M3 x 16 screw which was analysed before and after controlled corrosion in a flow cell. We use X-ray microcomputed tomography (XCT), dark-field and phase contrast XCT, and scanning electron microscopy (SEM) to analyse microstructural changes during degradation. While microcracks in corroded parts can only be visualized at very high XCT scanning resolutions or SEM imaging, DFC images show a clear indication of corroding regions. Since DFC delivers morphological information in the sub-pixel regime it is possible to quantify microcracks in relatively large samples whereas single microcracks are visible in SEM images but not in low-resolution attenuation contrast images, e.g. at a voxel size of 10 μm. X-ray dark-field imaging improves defect detection in corroded Mg samples without the necessity of small sample dimensions, hence providing a new approach to quantify degradation rates in corroding Mg implants in three dimensions.
Original languageEnglish
Title of host publicatione-Journal of Nondestructive Testing
ISBN (Electronic)1435-4934
Publication statusPublished - 1 Mar 2024
Event13th Conference on Industrial Computed Tomography - University of Applied Sciences Upper Austria - Wels Campus, Wels, Austria
Duration: 6 Feb 20249 Feb 2024


Conference13th Conference on Industrial Computed Tomography
Abbreviated titleiCT Conference 2024
Internet address

Research Field

  • Casting Processes for High Performance Materials


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