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The high microhardness of electrodeposited Fe-C coatings with around 800 HV after electrodeposition increased to about 1300 HV by dedicated annealing, reflecting a huge potential for surface engineering. The coatings remain nanocrystalline during annealing, but co-deposited carbon and oxygen result in temperature induced phase transformations. Energy-dispersive synchrotron diffraction revealed that carbides and oxides form during annealing of the asdeposited coating, which consisted mainly of carbon-free ferrite. The understanding of occurring precipitations was supplemented and verified by in-situ thermal analysis, which revealed the temperatures of thermal events related to decomposition reactions, the evolution of gasses and associated mass changes during annealing.

 Users may download and print one copy of any publication from the public portal for the purpose of private study or research.  You may not further distribute the material or use it for any profit-making activity or commercial gain  You may freely distribute the URL identifying the publication in the public portal If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.

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An austenitic stainless steel (TP 347H FG) was coated with a synthetic deposit and exposed, under laboratory conditions simulating straw-firing at 560 °C, for 1 week. Microscopic, diffraction, and spectroscopic techniques were employed for cross-sectional and plan view “top-down” microstructural characterization of the corrosion products. The corrosion products consisted of three layers: (i) the outermost layer consists of a mixed layer of K2SO4 and Fe x O y on a partly molten layer of the initial deposit, (ii) the middle layer consists of spinel (FeCr2O4) and Fe2O3, and (iii) the innermost layer is a sponge-like Ni3S2-containing layer. At the corrosion front, Cl-rich protrusions were observed. Results indicate that selective corrosion of Fe and Cr by Cl, active oxidation, and sulfidation attack of Ni are possible corrosion mechanisms.