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首页> 外文期刊>Corrosion science >Novel corrosion experiments using the wire beam electrode. (Ⅰ) Studying electrochemical noise signatures from localised corrosion processes
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Novel corrosion experiments using the wire beam electrode. (Ⅰ) Studying electrochemical noise signatures from localised corrosion processes

机译：使用线束电极的新型腐蚀实验。 （Ⅰ）研究局部腐蚀过程的电化学噪声特征

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This series of papers presents four novel experiments that were designed to study localised corrosion phenomena using an electrochemically integrated multi-electrode array namely the wire beam electrode (WBE). This present paper reports a WBE based experimental method that has been employed, for the first time, to study electrochemical noise patterns (called noise signatures) from localised corrosion processes. The objective of this work is to demonstrate the applicability of the WBE for investigating the origin of spontaneous electrode potential/current fluctuations and their effects on electrochemical processes. The key strategy of this work is to apply the WBE in a novel experimental set-up to simultaneously measure electrode potential noise and WBE current distribution maps—an approach that allows the direct comparison and correlation of electrochemical noise and corrosion events. Preliminary experiments have been carried out using a classic pitting corrosion system: stainless steel in a solution containing FeCl_3. A large number of anodic sites were found to exist on WBE surface at the very beginning of its exposure to the corrosion environment. Correlation between characteristic patterns in electrode potential noise and corrosion behaviour has been observed. More specifically, the characteristic sharp peaks in potential noise data (called noise signature Ⅰ) were found to correlate with the sudden disappearance of single unstable anode in WBE current distribution maps. The characteristic noise pattern of quick potential changes followed by partial or no recovery (called noise signature Ⅱ) was found to correspond with the massive disappearance of minor anodes in WBE current distribution maps. This result suggests that, in the corrosion system under study, electrode noise activities were associated with the disappearance of minor anodic sites, which lead to the eventual disappearance of most anodic sites. Localised corrosion was the result of the accelerated anodic dissolution of a small number of remaining anodic sites. The characteristics features in electrochemical noise and in WBE maps were reproducible.
机译：该系列论文提出了四个新颖的​​实验，旨在使用电化学集成的多电极阵列即线束电极（WBE）研究局部腐蚀现象。本文报道了基于WBE的实验方法，该方法首次被用于研究局部腐蚀过程中的电化学噪声模式（称为噪声特征）。这项工作的目的是证明WBE在研究自发电极电位/电流波动的起因及其对电化学过程的影响方面的适用性。这项工作的关键策略是将WBE应用到新颖的实验装置中，以同时测量电极电位噪声和WBE电流分布图，该方法可以直接比较和关联电化学噪声和腐蚀事件。已经使用经典的点蚀系统进行了初步实验：不锈钢在含有FeCl_3的溶液中。在暴露于腐蚀环境的一开始，发现在WBE表面存在大量的阳极部位。已经观察到电极电位噪声中的特征图案与腐蚀行为之间的相关性。更具体地说，在WBE电流分布图中，潜在噪声数据中的特征尖峰（称为噪声特征Ⅰ）与单个不稳定阳极的突然消失相关。在WBE电流分布图中，发现电位快速变化然后部分恢复或不恢复的特征性噪声模式（称为噪声特征Ⅱ）与次要阳极的大量消失相对应。该结果表明，在所研究的腐蚀系统中，电极噪声活动与较小的阳极位点的消失有关，这导致大多数阳极位点的最终消失。局部腐蚀是少数剩余阳极位加速阳极溶解的结果。在电化学噪声和WBE图中的特征是可重现的。

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