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SM ISO690:2012 DIKUSAR, Aleksandr , SILKIN, Serghei. Formation and Breakdown of Oxide Films in High-Rate Anodic Dissolution of Chromium–Nickel Steels in Electrolytes for Electrochemical Machining. In: Surface Engineering and Applied Electrochemistry, 2022, nr. 4(58), pp. 313-322. ISSN 1068-3755. DOI: https://doi.org/10.3103/S1068375522040056 |
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Surface Engineering and Applied Electrochemistry | ||||||
Numărul 4(58) / 2022 / ISSN 1068-3755 /ISSNe 1934-8002 | ||||||
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DOI:https://doi.org/10.3103/S1068375522040056 | ||||||
Pag. 313-322 | ||||||
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Abstract: It is shown that, in high-rate pulsed galvanostatic anodic dissolution of type CSN17335 and AISI 304 chromium–nickel steels in electrolytes for electrochemical machining (ECM) (chloride, nitrate, and mixed chloride–nitrate solutions with a conductivity of 0.15 S/cm) using microsecond pulses with a duration of 20–2000 μs and current densities in the range of 1–100 A/cm2, a substantial fraction of charge (up to ~40%) is spent on the formation of a passivating oxide film with a semiconducting behavior. The electrochemical treatment therefore directly involves the oxide film, not the alloy. As a consequence, the current efficiency of ECM of these materials is ~60–70%, depending on the alloy composition. When using direct current, the rate of machining increases as a result of the oxide film breakdown due to its thermokinetic instability (“thermal explosion”) caused by a rise in the surface temperature. |
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Cuvinte-cheie chromium–nickel steels, electrochemical machining, electrolytes for electrochemical machining, oxide film breakdown, oxide films, Passivation, pulsed machining |
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