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Reaction Mechanisms of High-Rate Copper Electrochemical Machining in Nitrate Electrolytes
Leonie Jakob1, Jonas Bartsch1, Ingo Krossing2
1Metallization and Structuring Technologies, Fraunhofer Institute for Solar Energy Systems ISE, Heidenhofstr. 2, 79110, Freiburg, Germany.
Abstract:
The high-rate electrochemical dissolution of copper in nitrate electrolytes is investigated primarily via polarization curves, while varying parameters such as the electrolyte flow velocity, the electrolyte resistance, the anode geometry, and the temperature. This study focuses on the re-rise in current at high voltages after the limiting current plateau. As a result of the studies, a change in the complexation mechanism from hydration to "solvo-nitration" is proposed, which requires an additional potential drop within the electrochemical double layer.
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