Abstract
In this paper, the effects of complexing agents (oxalic acid and glycine) and Fe(II) ions on the electro-reduction of Cr(III) ions are studied carefully. Based on the electrochemical analyses, both the complexing agents and Fe(II) ions can obviously decrease the cathodic polarization in the electro-reduction of Cr(III) ions, and the Fe(II) ions can also be co-deposited with Cr(III) ions. One water molecule in [Cr(III)(H 2 O) 6 ] 3+ ion is substituted by one oxalic acid or glycine to form an electrochemically active penta-aqua-Cr(III) coordination ion. In situ infrared spectroscopy and energy dispersive spectroscopy reveal the typical induced-deposition mechanism of ferrochrome alloy. Fe(II) ions are firstly reduced to Fe crystal nuclei, then Cr and Fe atoms grow on the Fe nuclei to form ferrochrome alloy. • Complexing agents (oxalic acid and glycine) or Fe(II) ions promote the electro-reduction of Cr(III) ions. • Oxalic acid or glycine can replace one water molecule in the [Cr(H 2 O) 6 ] 3+ ion. • The deposition potential of Fe(II) ions is more positive than that of Cr(III) ions. • Fe(II) ions are firstly electro-reduced to form Fe crystal nuclei during ferrochrome co-deposition.
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