Influence of carbon on electrochemical characteristics of the molten iron/slag interface

•Carbon greatly increases interfacial capacitance and excess charge density.•Shift in potentials of zero charge show carbon causes specific adsorption.•Esin and Markov coefficient shows carbon carries a net charge of +5.9 ± 2.6 in molten iron.•Carbon is capillary active at the molten iron/slag inter...

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