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首页> 外文会议>International Symposium on State-of-the-Art Application of Surface and Interface Analysis Methods to Environmental Material Interactions: in Honor of James E.Castle's 65th Year, Mar 26-27, 2001, Washington D.C. >A STUDY OF CORROSION AND PITTING INITIATION OF AA2024-T3 USING ATOMIC FORCE MICROSCOPY
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A STUDY OF CORROSION AND PITTING INITIATION OF AA2024-T3 USING ATOMIC FORCE MICROSCOPY

机译：利用原子力显微镜研究AA2024-T3的腐蚀和点蚀

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摘要

The corrosion behavior of a population of microstructural inclusions in AA2024-T3 and the interactions between individual inclusions were investigated using atomic force microscopy based techniques. The results showed that Al-Cu-Fe-Mn intermetallic particles were cathodic in nature and interacted strongly with their surroundings. For large exposed areas, it was found that pitting initiated at a few Al_2CuMg particles, which became active upon film breakdown even though SKPFM measurements in air showed they were noble with respect to the matrix prior to the exposure. The size and location of the cathodic regions proved to be critical issues. Accelerated matrix dissolution took place for exposed areas containing a large area fraction of Al-Cu-Fe-Mn inclusions. The location of the cathodic sites had a strong influence on the local chemistry of the environment and controlled the corrosion behavior of the surface. Potentiodynamic measurements made using a remote cathode indicated no copper redeposition around the pit and on the matrix, in contrast with open circuit measurements, where active cathodic inclusions modify the local pH. It was also found that pits generated at Al_2CuMg inclusions became ennobled as a result of Cu enrichment, but did not become active cathodic sites.
机译：使用基于原子力显微镜的技术研究了AA2024-T3中大量微结构夹杂物的腐蚀行为以及各个夹杂物之间的相互作用。结果表明，Al-Cu-Fe-Mn金属间化合物在本质上是阴极，并与周围环境强烈相互作用。对于大的暴露区域，发现点蚀始于一些Al_2CuMg颗粒，即使在空气中进行SKPFM测量表明它们相对于暴露前的基体而言是高贵的，但在膜破裂后该点变得活跃。阴极区域的大小和位置被证明是关键问题。对于含有大量面积的Al-Cu-Fe-Mn夹杂物的暴露区域，发生了加速的基体溶解。阴极位置的位置对环境的局部化学有很大影响，并控制了表面的腐蚀行为。与开路测量相反，采用开路阴极进行的电位动力学测量表明，坑周围和基体上没有铜再沉积，而活性阴极夹杂物改变了局部pH。还发现，由于Cu富集，Al_2CuMg夹杂物产生的凹坑变得高贵，但没有成为活性阴极位。

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