Abstract
The anodic dissolution of copper in chloride electrolytes with different pH has been investigated by using polarization measurements and digital holography. In acidic and neutral NaCl solutions, the oxidation processes of copper are almost the same: copper firstly dissolves as cuprous ions, which then produces the CuCl salt layer. The dissolution rate in the acidic solution is a little higher than that in the neutral. However, the mechanism is quite different in the alkaline NaCl solution: copper turns passive easily due to the formation of a relatively stable Cu2O film which results in pitting, and the dissolution rate of copper decreases before pit initiation.
Highlights
Copper is one of the most important materials in the industry owing to its relatively noble properties
Time-resolved, in situ visualizations of the dynamic processes of anodic dissolution of copper directly at the electrode/electrolyte interface, using digital holography combined with potentiostatic and potentiodynamic polarization
Neutral and Acid Chloride Electrolytes copper in neutral and acid NaCl solutions was investigated by use of potentiodynamic polarization andbeen digitalreported holography
Summary
Copper is one of the most important materials in the industry owing to its relatively noble properties. In our previous studies [6], anodic dissolution of copper in TheNaCl anodic processes copper in chloride electrolytes are surprisingly complex as polarization Both soluble neutral solution wasof investigated with digital holography and potentiodynamic and results insoluble are involved. Chloride media, the electro-dissolution processes of copper in NaCl solutions with different pH order to verify the dissolution mechanisms ofat copper in acidic, We neutral, anddetailed, alkaline haveIn been investigated byanodic monitoring the diffusion layers the interface. Time-resolved, in situ visualizations of the dynamic processes of anodic dissolution of copper directly at the electrode/electrolyte interface, using digital holography combined with potentiostatic and potentiodynamic polarization.
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