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Gewählte Publikation:

Wagner, S; Hummel, C; Santner, J; Puschenreiter, M; Irrgeher, J; Wenzel, WW; Borisov, SM; Prohaska, T.
(2022): In situ spatiotemporal solute imaging of metal corrosion on the example of magnesium
ANAL CHIM ACTA. 2022; 1212, 339910 FullText FullText_BOKU

Abstract:
Visualization and quantification of corrosion processes is essential in materials research. Here we present a new approach for 2D spatiotemporal imaging of metal corrosion dynamics in situ. The approach combines time-integrated Mg2+ flux imaging by diffusive gradients in thin films laser ablation inductively coupled plasma mass spectrometry (DGT LA-ICP-MS) and near real-time pH imaging by planar optodes. The parallel assessment of Mg2+ flux and pH distributions on a fine-structured, bare Mg alloy (b-WE43) showed intense Mg dissolution with Mg2+ flux maxima up to 11.9 ng cm(-2) s(-1) and pH increase >9 during initial corrosion (<= 15 min) in aqueous NaNO3 solution (c = 0.01 mol L-1). The techniques visualized the lower initial corrosion rate in buffered synthetic body fluid (Hank's balanced salt solution; pH 7.6) compared to unbuffered NaNO3 (pH 6.0), but precise localization of Mg corrosion remains challenging under these conditions. To further demonstrate the capability of DGT LA-ICP-MS for spatiotemporal metal flux imaging at the microscale, a coated Mg alloy (c-WE43) with lower reactivity was deployed for <= 120 min. The high spatial resolution (similar to 10 mu m x 80 mu m) and low limits of detection (<= 0.04 ng cm(-2) s(-1), t = 60 min) enabled accurate in situ localization and quantification (U-rel = 20%, k = 2) of distinct Mg2+ flux increase, showing micro-confined release of Mg2+ from surface coating defects on c-WE43 samples. The presented approach can be extended to other metal species and applied to other materials to better understand corrosion processes and improve material design in technological engineering.
Autor*innen der BOKU Wien:
Hummel Christina
Puschenreiter Markus
Santner Jakob
Wagner Stefan
Wenzel Walter
BOKU Gendermonitor:


Find related publications in this database (Keywords)
Diffusive gradients in thin films (DGT)
Planar optodes
Materials science
Interfaces
Alloys
Chemical imaging
Laser ablation inductively coupled plasma mass spectrometry


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