Electrochemical noise of AA2024 in solutions promoting IGC

摘要

In different industrial sectors, as in aeronautic, standardized tests are usually employed to control the quality of the materials used. In the case of metallic components, various restrictions must be satisfied, among them an appropriate corrosion resistance. There are a lot of standardized tests that allow the evaluation of the corrosion behaviour of metallic samples. Some of them have the aim of determining the susceptibility to Intergranular Corrosion (IGC). The latter tests are based on immersion treatments of the samples in aggressive solutions, with the damage being evaluated later by means of metallographic analysis. The main objective of this work has been to study the influence of different variables of these tests (such as the immersion time and the composition of the solutions) on the damage suffered by AA2024-T3 samples. For this purpose, Electrochemical Noise (EN) measured during the tests and metallographic characterisation performed after the tests were analysed. The obtained results have showed that both the morphology and the depth of the attacks vary when these variables are modified.