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In this study, the corrosion mechanisms of the AA2024-T3 and the AA2098-T351 were investigated and compared using various electrochemical techniques in 0.005 mol L −1 NaCl solution. The severe type of corrosion in the AA2098-T351 was intragranular attack (IGA) although trenching and pitting related to the constituent particles were seen. On the other hand, the AA2024-T3 exhibited severe localised corrosion associated with micrometric constituent particles, and its propagation was via grain boundaries leading to intergranular corrosion (IGC). Electrochemical techniques showed that the corrosion reaction in both alloys was controlled by diffusion. The non-uniform current distribution in both alloys showed that EIS was not a proper technique for comparing the corrosion resistance of the alloys. However, local electrochemical techniques were useful for the evaluation of the corrosion resistance of the alloys.

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The 6061 alloy is used in different thermomechanical conditions in research nuclear reactors.Nuclear fuel plates are manufactured by the picture frame technique (PFT) and the 6061 alloy is used as cladding for the nuclear fuel "sandwiches". After the process, these nuclear plates are placed in a case composed of 6061-T6 alloy. In this work, the galvanic effects of coupling the 6061 alloy in the T6 and PFT conditions on the corrosion behavior was investigated in solutions of different chloride contents. The results showed that galvanic corrosion was favored due to the different microstructural features related to these two thermomechanical conditions of the 6061 alloy. The 6061 alloy in the PFT condition was cathodic to the alloy in the T6 condition. Local electrochemical techniques were useful in characterizing the electrochemical behavior of the coupled alloys. ,