Electrochemical dissolution of gold in presence of chloride and bromide traces studied by on-line electrochemical inductively coupled plasma mass spectrometry

Electrochemical dissolution of gold in the presence of halide ions is traditionally considered as a model case in metal corrosion and passivation studies. Due to a relatively low sensitivity of the conventional techniques, such studies were predominantly limited to electrolytes with high concentrati...

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Bibliographic Details
Published in:Electrochimica acta 2016-12, Vol.222, p.1056-1063
Main Authors: Kasian, Olga, Kulyk, Nadiia, Mingers, Andrea, Zeradjanin, Aleksandar R., Mayrhofer, Karl J.J., Cherevko, Serhiy
Format: Article
Language:English
Subjects:
corrosion
gold
halide ions
oxidation
passivation
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Summary:Electrochemical dissolution of gold in the presence of halide ions is traditionally considered as a model case in metal corrosion and passivation studies. Due to a relatively low sensitivity of the conventional techniques, such studies were predominantly limited to electrolytes with high concentrations of halides. The current work employs a special electrochemical scanning flow cell with online inductively coupled plasma mass spectrometry (SFC-ICP-MS) that allows overcoming those limitations, enabling the quantification of gold dissolution in the presence of chloride and bromide traces (1μM≤[Cl−/Br−]≤100μM). Moreover, time- and potential-resolved gold dissolution profiles under different potential programs are provided. Based on the experimental results, a tentative mechanism of gold dissolution based on the catalyzing role of hydroxyl and halide anions is discussed.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2016.11.074