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首页> 外文期刊>Corrosion science >Novel corrosion experiments using the wire beam electrode. (Ⅳ) Studying localised anodic dissolution of aluminium
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Novel corrosion experiments using the wire beam electrode. (Ⅳ) Studying localised anodic dissolution of aluminium

机译：使用线束电极的新型腐蚀实验。 （Ⅳ）研究铝的局部阳极溶解

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An electrochemically integrated multi-electrode array namely the wire beam electrode (WBE) has been applied in novel experiments to study the anodic dissolution behaviour of aluminium (AA1100), which was exposed to corrosive media with and without the presence of corrosion inhibitor potassium dichromate. The objective of this work is to demonstrate the applicability of the WBE for investigating corrosion processes under anodic polarisation. Anodic current measurements and mapping have been made, for the first time, with the WBE surface being anodically polarised. Pitting potential as well as anodic dissolution profile has been successfully determined by mapping anodic dissolution currents over the anodically polarised WBE surface. The pitting potential determined using the WBE method was found to correlate well with that determined using the conventional pitting scan method; and the anodic dissolution profile determined using the WBE method was found to correlate with maps obtained using the scanning reference electrode technique (SRET). Potassium dichromate was found to significantly affect the pitting potential, anodic dissolution profile and pitting initiation characteristics of aluminium. Two mechanisms of localised corrosion initiation have been identified. For WBE surface under free corrosion or low anodic polarisation conditions, the initiation of localised corrosion was found to be due to the disappearance of minor anodes, which lead to accelerated dissolution of a few major anodes. For WBE surface under large anodic polarisation, the initiation of localised corrosion was found to be due to the formation of active new anodic sites. This work suggests that the WBE method is useful for understanding the electrochemical behaviour of localised anodic processes, and their dependence on externally controllable variables.
机译：电化学集成的多电极阵列，即线束电极（WBE）已用于新型实验中，以研究铝（AA1100）的阳极溶解行为，铝在暴露于腐蚀性介质中的腐蚀抑制剂有无重铬酸钾存在。这项工作的目的是证明WBE在研究阳极极化条件下的腐蚀过程中的适用性。第一次进行了阳极电流测量和标测，其中WBE表面被阳极极化。通过在阳极极化的WBE表面上绘制阳极溶解电流，可以成功确定点蚀电位和阳极溶解曲线。发现使用WBE方法测定的点蚀电位与使用常规点蚀扫描法测定的电位具有很好的相关性。并且发现使用WBE方法确定的阳极溶出曲线与使用扫描参考电极技术（SRET）获得的图相关。发现重铬酸钾显着影响铝的点蚀电位，阳极溶出曲线和点蚀引发特性。已经确定了两种局部腐蚀引发机理。对于自由腐蚀或低阳极极化条件下的WBE表面，发现局部腐蚀的起因是由于次要阳极的消失，这导致了一些主要阳极的加速溶解。对于大阳极极化下的WBE表面，发现局部腐蚀的起因是由于新的活性阳极位点的形成。这项工作表明，WBE方法对于理解局部阳极过程的电化学行为及其对外部可控变量的依赖性很有用。

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