非稳态电流极化下不锈钢在氯化钠溶液中的溶解

R. Nurdillayeva, Zh.G. Sauirbay, A. Bayeshov
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引用次数: 4

摘要

不锈钢由于其机械强度、耐热性和耐腐蚀性而受到广泛的需求。本文介绍了不锈钢电极(12X18H10T)在中性介质(NaCl)中用50Hz交流电极化时的电化学溶解行为的研究结果。初步实验表明,当两个不锈钢电极用交流电极化时,主要过程不会发生。据观察,通过交流极化“不锈钢-钛”对电极,合金被强烈溶解,形成铁(II)和铬(III)离子。这是由于钛电极表面形成的氧化物层具有“阀门”特性。钛和钢电极的电流密度值的变化显著影响合金的电化学溶解过程。在高电流密度下,由于钛的电流校正性能的恶化,合金的溶解速率降低。随着电解质浓度的增加,电流效率随着盐钝化的发生而降低。在50Hz的电流频率下观察到不锈钢的电流溶解效率的最大值。由于交流电流的半周期的频繁变化,交流电流的高频不能为氧化反应提供阳极半周期的可调节持续时间。观察到,提高电解质的温度会降低不锈钢电极电化学溶解的电流效率。研究了主要电化学参数对电解过程的影响,确定了合金溶解的最佳条件(?Т?=60kA/m2,?SS=800A/m2,[NaCl]=2.0M,t=30,?=50Hz)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
DISSOLUTION OF STAINLESS STEEL IN SODIUM CHLORIDE SOLUTION AT POLARIZATION BY NON-STATIONARY CURRENT
Stainless steel is in great demand due to its mechanical strength, heat resistance, and resistance to corrosive environments. This article presents the result of a study of the electrochemical dissolution behavior of a stainless steel electrode (12X18H10T) at polarization by 50 Hz alternating current in a neutral medium (NaCl). Preliminary experiments have shown that the main processes do not take place when two stainless steel electrodes are polarized with an alternating current. It was observed that by the polarization of the “stainless steel – titanium” pair electrodes with alternating current, the alloy is intensively dissolved with the formation of iron (II) and chromium (III) ions. This is due to the "valve" properties of the oxide layer formed on the surface of the titanium electrode. A change in the value of the current density of the titanium and steel electrodes significantly affects the process of electrochemical dissolution of the alloy. At high current densities, the dissolution rate of the alloy decreases due to the deterioration of the current correcting properties of titanium. With an increase in the electrolyte concentration, the current efficiency is reduced as salt passivation occurs. A maximum value of the current efficiency of dissolution of stainless steel was observed at a current frequency of 50 Hz. High frequencies of the alternating current do not provide an adjustable duration of the anodic half-cycle for the oxidation reaction due to the frequent change of halfcycles of the alternating current. It was observed that increasing the temperature of the electrolyte reduces the current efficiency of the electrochemical dissolution of stainless steel electrodes. The effects of main electrochemical parameters on the electrolysis process have been investigated, and the optimal conditions of the alloy dissolution were established (іТі = 60 kA/m2 , іSS = 800 A/m2 , [NaCl] = 2.0 M, t = 30, ν = 50 Hz.).
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