Abstract
Fe-C coatings with a high amount of carbon were electrodeposited from an iron-sulfate electrolyte. Citric acid as an additive in the electrolyte not only served as a carbon source during electrodeposition but also caused the reproducible codeposition of oxygen and hydrogen. The various codeposited elements (C, O, H) result in the complex nature of the as-deposited coatings and allow for deliberate alterations of the coating properties by postdeposition annealing. The thermal evolution of electrodeposited Fe-C coatings was investigated in situ during isochronal annealing. In situ synchrotron diffraction analysis revealed temperature-dependent phase transformations, which were supplemented with in situ thermal analysis for investigating the evolution of codeposited elements and associated mass changes during annealing. Based on the determined activation energies of identified thermal events, the underlying mechanisms are discussed. The results clearly indicate the role of codeposited elements in the coatings and suggest that they partly exist in the form of organic compounds, which decompose during annealing. In addition to revealing the thermal stability of the coatings and quantifying the coatings’ thermal evolution, the complementary methods of in situ analysis considerably improved the understanding of the as-deposited Fe-C coatings—both are essential prerequisites for the successful application of the Fe-C coatings.
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Acknowledgments
The authors kindly acknowledge the financial support by OCAS NV, ArcelorMittal Global R&D Gent (Belgium), a. h. nichro Haardchrom (Denmark), and Fast Track-Societal Partnership (Denmark), funded by the Innovation Fund Denmark. M. Klaus, D. Apel, and C. Genzel from Helmholtz Zentrum für Materialien und Energie (Germany) are acknowledged for their valuable support during beamtime at the HZB-BESSY II Synchrotron Facility and during subsequent data analysis. Synchrotron diffraction measurements were financially supported by the project CALIPSOplus under Grant Agreement 730872 from the EU Framework Programme for Research and Innovation HORIZON 2020 and by the Danish Natural Science Research Council via Danscatt.
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Nielsen, J.O., Christiansen, T.L. & Pantleon, K. In Situ Analysis of the Thermal Evolution of Electrodeposited Fe-C Coatings. Metall Mater Trans A 51, 4880–4889 (2020). https://doi.org/10.1007/s11661-020-05904-z
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DOI: https://doi.org/10.1007/s11661-020-05904-z