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- W3213969807 abstract "Interfacial properties between molten iron and slag play important roles in many steelmaking processes but very little electrochemical features are known. In this work, the influence of carbon (1 to 4.5 wt%) on electrochemical interfacial properties between molten iron and slag was investigated at 1600 °C. Impedance spectroscopy was performed at various direct current biases to measure ohmic-corrected differential capacitance. Single and double integration of the latter was used to obtain excess charge density and electrocapillary curves. All alloys displayed potentials of zero charge cathodic to the rest potential, indicating the metal side of the electric double layer carries a positive charge at the rest potential. Anodic to the potential of zero charge, carbon causes a large capacitance peak, increases excess charge density, and steepens electrocapillary curves. This behaviour is characteristic of specific (chemical) adsorption at the metal/slag interface, as opposed to electrostatic (physical) adsorption. This was verified by observation of the Esin and Markov coefficient where carbon systematically shifted potentials of zero charge towards more negative values. Measurement of the Esin and Markov coefficient showed the charge number of carbon in molten iron to be +5.9 ± 2.6. Hence, carbon carries a net positive charge while dissolved in molten iron, brings excess charge density to the interface that increases capacitance, causes attraction between metal/slag, and reduces interfacial tension. While it is well known carbon is not surface active at the iron/gas interface, results show carbon is capillary active at the iron/slag interface." @default.
- W3213969807 created "2021-11-22" @default.
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- W3213969807 date "2022-01-01" @default.
- W3213969807 modified "2023-10-16" @default.
- W3213969807 title "Influence of carbon on electrochemical characteristics of the molten iron/slag interface" @default.
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- W3213969807 doi "https://doi.org/10.1016/j.electacta.2021.139565" @default.
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