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首页> 外文会议>NACE annual conference & exposition >ELECTROCHEMICAL QUARTZ CRYSTAL MICROBALANCE STUDY ON GOLD AND PHASES IN AA 2024-T3
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ELECTROCHEMICAL QUARTZ CRYSTAL MICROBALANCE STUDY ON GOLD AND PHASES IN AA 2024-T3

机译：AA 2024-T3中金和相的电化学石英晶体微平衡研究

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The electrochemical quartz crystal microbalance (EQCM) was used to directly measure the dissolution rate at cathodic potentials, and thus the cathodic corrosion rate, of thin film analogs of phases in AA2024. Thin films of pure Al, Al-4%Cu, and Al2Cu were studied in 0.1 M NaCl containing 0, 10-4, or 10-2 M Cr2O7-2. A range of cathodic potentials was studied for each material. The true cathodic current density was calculated from the difference of the net current density and the dissolution rate, which was determined by the EQCM. The presence of dichromate in solution decreased both the cathodic corrosion rate and the cathodic current density on these thin film analogs. In particular, it decreased more effectively the cathodic reaction rate on Al2Cu, which can support faster cathodic reaction rates. In order to understand the initial mass increase observed on the Al2Cu analog, experiments were performed with Au electrodes, which do not exhibit extensive oxide film formation or dissolution. In addition, open circuit exposure of the polyurethane-coated Au electrodes in 0.5 M NaCl was also performed to study the usefulness of the EQCM as one of the possible tools for assessment of the corrosion degradation in coated metal systems.
机译：电化学石英晶体微量天平（EQCM）用于直接测量AA2024中各相薄膜类似物在阴极电势下的溶解速率，从而测量阴极腐蚀速率。在含0、10-4或10-2 M Cr2O7-2的0.1 M NaCl中研究了纯Al，Al-4％Cu和Al2Cu的薄膜。研究了每种材料的阴极电位范围。根据净电流密度和溶出速率的差计算出真实的阴极电流密度，这是由EQCM确定的。溶液中重铬酸盐的存在降低了这些薄膜类似物的阴极腐蚀速率和阴极电流密度。特别是，它可以更有效地降低Al2Cu上的阴极反应速率，从而可以支持更快的阴极反应速率。为了了解在Al2Cu类似物上观察到的初始质量增加，使用Au电极进行了实验，该电极没有显示出大量的氧化膜形成或溶解。此外，还对聚氨酯涂层的Au电极在0.5 M NaCl中进行开路暴露，以研究EQCM作为评估涂层金属体系中腐蚀退化的可能工具之一的有用性。

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