Correlations between the Volta potential and filiform corrosion on painted AA2024 aluminum alloy
Correlations between the Volta potential and filiform corrosion on painted AA2024 aluminum alloy
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涂漆 AA2024 铝合金伏特电位与丝状腐蚀的相关性
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
S. Rossi
中科院分区：
文献类型：
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作者：
M. Fedel;F. Deflorian;S. Rossi
涂层AA2024合金对丝状腐蚀的敏感性已被广泛证实，但测定其抗丝状腐蚀性能的分析方法仍在研究中。这项工作旨在分析涂层AA2024样品的化学和电化学性能与其对丝状腐蚀的敏感性之间可能的相关性。特别地，研究了三种不同底漆的不同性能。本文对涂层样品的功函数差异、丝状腐蚀的进展和有机引物的阻隔性能之间可能存在的关系提出了一些假设。根据EN 3665:1997标准中提出的程序，对预处理和底漆涂层样品的丝状耐腐蚀性进行了评估。结果与加速试验开始前在完整引物上进行的多次扫描开尔文探针（SKP）测量结果进行了比较。通过电化学阻抗谱测量完成了电化学表征。为了找到与SKP结果的直接关系，对引物-金属界面的性质进行了研究。提出了在完整样品上测量的功函数差与抗丝状腐蚀之间可能存在的相关性。版权所有©2009 John Wiley & Sons， Ltd
The susceptibility to filiform corrosion of painted AA2024 alloy has been widely demonstrated, but an analytical method to determine the filiform corrosion resistance is still under investigation. This work aims at analyzing the possible correlations between the chemical and electrochemical properties of coated AA2024 samples and their susceptibility to filiform corrosion. In particular, the different behaviors of three different primer coatings have been investigated. The work proposes a few hypotheses of possible correlations among the work function difference of the coated samples, the progress of the filiform corrosion and the barrier properties of the organic primers. The filiform corrosion resistance of the pretreated and primer‐coated samples has been evaluated following the procedure proposed in the EN 3665:1997 standard. The results have been compared with multiple scanning Kelvin probe (SKP) measurements performed on the intact primers before the beginning of the accelerated test. The electrochemical characterization has been completed by means of electrochemical impedance spectroscopy measurements. The properties of the primer–metal interface have been investigated in order to find a direct correlation with the SKP results. A possible correlation between the work function difference measured on the intact sample and the resistance to filiform corrosion is proposed. Copyright © 2009 John Wiley & Sons, Ltd.