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:
The corrosion behaviour of the aluminium alloy, AA6082, processed by equal-channelangular pressing (ECAP) after different passes (route E, room temperature) was studied incomparison to the coarse-grained counterpart. The results of the electrochemical investigations(cyclovoltammetry; electrochemical impedance spectroscopy, EIS) are presented in correlation withthe microstructure before and after the corrosion examinations. Both, chemical (precipitations,phases) and physical (dislocations, high-angle grain boundaries, grain size, low-angle grainboundaries) inhomogeneities characterize the microstructure of this commercially used Al-Mg-Sialloy. Results indicate an improved resistance against pitting of the ECAP material expressed by areduced pitting density of up to 50 % and lower pit depths. EIS measurements and microstructuralexaminations (scanning electron microscopy, transmission electron microscopy, 3D topographymeasurement) confirm that ECAP modifies the number, size and distribution of theseinhomogeneities, which leads to a more favourable corrosion behaviour
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.584-586.988.pdf
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