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:
Aluminum alloys have found many applications in different branches of industry. In spiteof the valuable properties, there is a significant drawback because of the strong corrosionsusceptibility, especially in chloride-containing medium. The present work is focused on study ofthe 2024 aluminum alloy corrosion mechanism on early stages using Scanning Kelvin Probe ForceMicroscopy (SKPFM). The corrosion impact was studied measuring the Volta potential (VP) andtopography of alloy matrix and S-phase intermetallics after immersion in different electrolytes andpH. It is shown that presence of the chloride anions in the electrolyte leads to increase of aluminummatrix potential for about 100 mV. This can be resulted from the adsorption of chloride ions andtheir incorporation into the native oxide layer changing semiconductive properties of the oxide. Thezones surrounding the S-phase intermetallics are changed more significantly demonstrating higherincrease of VP close to the inclusion. These regions are correlated with the increased oxygencontent suggesting formation of thicker oxide layer due to local polarization. Addition of aninhibitor to electrolyte also leads to change in Volta potential that is reflected on lower corrosionimpact of aggressive environment
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.587-588.405.pdf
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