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首页> 外文期刊>International Journal of Electrochemical Science >Pitting Corrosion Evaluation of Titanium in NaBr Solutions by Electrochemical Methods and Raman Spectroscopy
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Pitting Corrosion Evaluation of Titanium in NaBr Solutions by Electrochemical Methods and Raman Spectroscopy

机译：电化学法和拉曼光谱法评估NaBr溶液中钛的点蚀腐蚀

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摘要

The behavior of passive titanium grade 2 (Ti-2) alloy in sodium bromide solutions of differentconcentrations, following induction of an electric field, was characterized by cyclic potentio-dynamicpolarization and electrochemical impedance spectroscopy. The outcome of this exposure was assessedby morphologic characterization via scanning electron microscopy and by depth layer element analysiswith X-ray photoelectron spectroscopy. In relatively diluted solutions, the Ti-2 had shown sensitivityto pitting corrosion and breakdown of the passivation layer, while in saturated solution no pitting wasencountered, indicating an anomalous behavior for the latter. This was confirmed by measurement ofthe Raman spectra of the different solutions, which showed that the amount of free water molecules isnegligible in saturated solutions and in fact the ultimate majority of water molecules are bounded tothe dissolved ions. The implications of these factors on Ti-2 corrosion will be discussed.
机译：感应电场后，通过循环电位动极化和电化学阻抗谱表征了钝化2级钛（Ti-2）钛合金在不同浓度的溴化钠溶液中的行为。通过经由扫描电子显微镜的形态表征以及通过具有X射线光电子能谱的深度层元素分析来评估该暴露的结果。在相对稀释的溶液中，Ti-2表现出对点蚀和钝化层击穿的敏感性，而在饱和溶液中则没有出现点蚀，表明后者具有异常行为。通过测量不同溶液的拉曼光谱证实了这一点，该结果表明，在饱和溶液中游离水分子的数量微不足道，实际上，最终的大多数水分子都与溶解离子结合。将讨论这些因素对Ti-2腐蚀的影响。

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