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首页> 外文期刊>International Journal of Electrochemical Science >Analysis of Electrochemical Impedance and Noise Data for AISI-310 Exposed to Lithium Bromide Solution
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Analysis of Electrochemical Impedance and Noise Data for AISI-310 Exposed to Lithium Bromide Solution

机译：溴化锂溶液中AISI-310的电化学阻抗和噪声数据分析

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The corrosion behavior of AISI-310 in aqueous lithium bromide solution (50.0 % w/w) at 25, 60 and80C has been studied through polarization curves (PC), the electrochemical noise technique (EN) andthe electrochemical-impedance spectroscopy (EIS). Physical characterization of the corroded samplesindicated that AISI-310 exposed at 25C suffered a uniform corrosion process, whereas at 60 and 80Ca mixed corrosion process was observed, which was in agreement with the localization indexescalculated from EN data. The corrosion activity was analyzed taking into account the noise pattern,which was alike for the three test temperatures, observing a low amplitude/high frequency noise withsome medium intensity current transients, especially at the highest temperature. EIS results showedthat the temperature is an important issue in the corrosion controlled reaction, since at 25C, a purediffusion-controlled reaction was predominantly seen, at 60C an activation-controlled step wasobserved, whereas at the higher temperature both diffusion and charge transfer controlled steps wereobserved. The corrosion kinetics was calculated from the resistance noise obtained from EN data, andthen the Stern-Geary equation and the Faraday Law were used. The corrosion kinetics showed that at60C the corrosion rate was somewhat higher than that at 80C, which could also be seen in theelectrochemical current noise, where the current density was higher at 60C. This behavior wassupported due to the changes in the thermodynamic characteristics of the lithium bromide solution,since at 80C the aqueous solution at the experimental concentration tends to crystallize.
机译：通过极化曲线（PC），电化学噪声技术（EN）和电化学阻抗谱（EIS）研究了AISI-310在25、60和80℃的溴化锂水溶液（50.0％w / w）中的腐蚀行为。腐蚀样品的物理特性表明，暴露于25℃的AISI-310经历了均匀的腐蚀过程，而在60和80Ca处观察到了混合腐蚀过程，这与根据EN数据计算出的局部化指数是一致的。考虑到三个测试温度下的噪声模式，分析了腐蚀活性，观察到了低振幅/高频噪声以及一些中等强度的电流瞬变，尤其是在最高温度下。 EIS结果表明温度是腐蚀控制反应中的一个重要问题，因为在25℃时主要观察到纯扩散控制的反应，在60℃时观察到了活化控制步骤，而在较高温度下，观察到了扩散和电荷转移控制步骤。根据从EN数据获得的电阻噪声计算腐蚀动力学，然后使用Stern-Geary方程和法拉第定律。腐蚀动力学表明，在60℃时腐蚀速率比在80℃时高一些，这也可以从电化学电流噪声中看出，在60℃时电流密度较高。由于溴化锂溶液的热力学特性的变化，支持了该行为，因为在80℃下，实验浓度的水溶液易于结晶。

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