ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Al 2024-T3 is an important alloy very prone to localized corrosion. In this investigationthe effect of chloride concentration on the corrosion resistance of the Al 2024-T3 alloy has beenstudied, focusing on the dissolution of the intermetallics (IMCs). Sodium chloride solutions of twoconcentrations, 0.6 M and 0.01mM, were used as test electrolytes. During the investigation selectedregions of polished samples had their IMCs analyzed by Scanning Electron Microscopy (SEM) andX-ray Energy Analysis (EDX) prior and after different immersion times in the two test electrolytes.The results showed that even in the lowest chloride concentration the electrolyte was highlycorrosive to the Al-Cu-Mg IMCs leading to their partial dissolution and to the attack of thesurrounding matrix after only one hour of immersion. On the other hand, the corrosion behavior ofthe Al-Cu-Mn-Fe IMCs was random, and no correlation could be established between corrosiveattack and chloride concentration or time of immersion for this type of particle. Atomic ForceMicroscopy (AFM) analyses have indicated a stronger dissolution of the matrix in the moreconcentrated electrolyte. This seems to lead to a milder attack of the IMCs in this solution whencompared to the less concentrated one, as indicated in the SEM images
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.587-588.415.pdf
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