Abstract
Using a microsecond-pulsed current (20 μs) for the high-rate anodic dissolution of heat-resistant chromium−nickel alloys (current density amplitudes up to 100 A/cm2) can enable the improvement of the spatial confinement of anodic dissolution due to the presence of a growing dependence of current efficiency on the current density observed in these conditions. This effect, however, is limited to chromium−nickel steel only, and the duty cycle must be at least 4. We hypothesize that this dependence arises from thermokinetic effects that manifest as a series of interrelated processes with positive feedback: rate of electrochemical reaction (current density)−surface temperature−rate of electrochemical reaction. In certain critical conditions, this relationship results in thermokinetic instability and destruction of passive surface layers.
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Funding
This work was supported within institutional project 15.817.02.05.A (Moldova), the project “H2020 Smartelectrodes” (no. 778 357), and by the budget of Shevchenko Pridnestrovie State University (Moldova).
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Silkin, S.A., Aksenov, E.N., Likrizon, E.A. et al. Improving Spatial Confinement of Anodic Dissolution of Heat-Resistant Chromium−Nickel Alloys during Pulsed Electrochemical Machining. Surf. Engin. Appl.Electrochem. 55, 493–501 (2019). https://doi.org/10.3103/S1068375519050120
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DOI: https://doi.org/10.3103/S1068375519050120