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首页> 外文会议>Proceedings vol.2004-14; Electrochemical Society(ECS) International Meeting and Symposium on Corrosion in Marine and Saltwater Environments II; 20041003-08; Honolulu,HI(US) >ANALYSIS OF LOCAL CHANGES IN pH DURING DISSOLUTION OF ALUMINUM ALLOY 2024-T3 IN AQUEOUS NaCl
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ANALYSIS OF LOCAL CHANGES IN pH DURING DISSOLUTION OF ALUMINUM ALLOY 2024-T3 IN AQUEOUS NaCl

机译：铝合金2024-T3在NaCl水溶液中溶解过程中pH的局部变化分析

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摘要

Changes in solution pH during corrosion of aluminum alloy 2024-T3 in dilute, aqueous, near-neutral chloride environments were investigated using in-situ fluorescence microscopy and digital image processing techniques. Image processing permitted identification of alkaline and acidic areas in the electrolyte during the evolution of the corrosion process. Observed pH behavior was in some cases consistent with predicted phenomena and in other instances contrary to descriptions found in the current literature. Although localized corrosion occurred at the majority of s-phase particles, transient solution acidity, consistent with particle de-alloying, was observed above only a minority of isolated s-phase particles. Uniform alkalinity over large areas of the sample, consistent with a microelectrode effect, was seen several times during the experiment but patterns of transient local alkalinity were more prevalent. Persistent solution acidity consistent with pitting was also observed.
机译：使用原位荧光显微镜和数字图像处理技术研究了铝合金2024-T3在稀，含水，近中性氯化物环境中腐蚀期间溶液pH的变化。通过图像处理，可以识别腐蚀过程中电解质中的碱性和酸性区域。在某些情况下，观察到的pH行为与预测的现象一致，而在另一些情况下，则与当前文献中的描述相反。尽管局部腐蚀发生在大多数s相颗粒上，但仅在少数分离出的s相颗粒上方观察到与颗粒脱合金相符的瞬时溶液酸度。在实验过程中多次观察到大面积样品的均匀碱度，与微电极效应一致，但瞬态局部碱度的模式更为普遍。还观察到与点蚀一致的持久溶液酸度。

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