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 SM ISO690:2012SILKIN, Serghei, AKSENOV, E., LIKRIZON, E., PETRENKO, Vladimir, DIKUSAR, Aleksandr. Improving Spatial Confinement of Anodic Dissolution of Heat-Resistant Chromium−Nickel Alloys during Pulsed Electrochemical Machining. In: Surface Engineering and Applied Electrochemistry, 2019, nr. 5(55), pp. 493-501. ISSN 1068-3755. DOI: https://doi.org/10.3103/S1068375519050120 |
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  Surface Engineering and Applied Electrochemistry |
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| Numărul 5(55) / 2019 / ISSN 1068-3755 /ISSNe 1934-8002 | ||||||
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| DOI:https://doi.org/10.3103/S1068375519050120 | ||||||
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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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| Cuvinte-cheie ECM electrolytes, electrochemical machining, heat-resistant chromium−nickel alloys, high-rate anodic dissolution, pulsed processing |
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