Improving Spatial Confinement of Anodic Dissolution of Heat-Resistant Chromium−Nickel Alloys during Pulsed Electrochemical Machining
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SILKIN, 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.
10.3103/S1068375519050120
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Surface Engineering and Applied Electrochemistry
Numărul 5(55) / 2019 / ISSN 1068-3755 /ISSNe 1934-8002

Improving Spatial Confinement of Anodic Dissolution of Heat-Resistant Chromium−Nickel Alloys during Pulsed Electrochemical Machining


DOI: 10.3103/S1068375519050120
Pag. 493-501

Silkin Serghei12, Aksenov E.1, Likrizon E.1, Petrenko Vladimir3, Dikusar Aleksandr 13
 
1 T.G. Shevchenko State University of Pridnestrovie, Tiraspol,
2 Kostroma State University,
3 Institute of Applied Physics
 
Disponibil în IBN: 5 noiembrie 2019


Rezumat

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.

Cuvinte-cheie
ECM electrolytes, electrochemical machining, heat-resistant chromium−nickel alloys, high-rate anodic dissolution, pulsed processing