Abstract

A pulsed galvanostatic anodic dissolution of chromium−nickel steels (types Kh18N10 (Cr18Ni10) and KhN35VT (CrNi35WT)) under the conditions of electrochemical machining is studied in chloride, nitrate, and mixed chloride−nitrate electrolytes at current densities up to 100 A/cm². In all the considered solutions (except for the dissolution of CrNi35WT in chloride solutions), for relative pulse durations s ≥ 2 (duty cycle D ≤ 50%), the faradaic rate of dissolution reaches a limiting value of ~0.18 mg/C, irrespective of pulse duration (from 20 μs to 2 ms), which translates into the current efficiencies of alloy dissolution of 50 and 68% for the Cr18Ni10 and CrNi35WT alloys, respectively. Using direct current for processing (i.e., s < 2) boosts the current efficiency, and the rise in surface temperature is crucial to this effect.

中文翻译：

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电化学加工电解液中铬镍钢的高速脉冲恒电流阳极溶解：表面温度的作用

摘要

研究了铬镍钢（类型Kh18N10（Cr18Ni10）和KhN35VT（CrNi35WT））在电化学加工条件下在电流密度高达100 A / cm的氯化物，硝酸盐和氯化物-硝酸盐混合电解液中的脉冲恒电流阳极溶解。²。在所有考虑的解决方案（除了CrNi35WT在氯化物溶液的溶解），用于相对于脉冲持续时间小号≥2（占空比d ≤50％），溶解的法拉第率达到〜0.18毫克/ C的极限值，而不论脉冲持续时间（从20μs到2 ms）的变化，这意味着Cr18Ni10和CrNi35WT合金的合金溶出效率分别为50％和68％。使用直流电的处理（即，小号 <2）可以提高电流效率，而表面温度的升高对此效应至关重要。